Why Do You Need A Water Supply For Concrete Cutting? 

Concrete cutting is a messy business, literally. Concrete dust can take over if you are not careful. Concrete dust is very harmful to the body and can cause irreversible damage to your lungs. 

It can also cause severe damage to your eyes if you do not wear the appropriate eye protection. This and more are the reasons why wet cutting is the best way to cut concrete. 

It causes less damage to the concrete saw blade, produces less dust and is much safer for the saw operator and people within the vicinity.

There are several reasons why it is crucial to have a steady supply of water when cutting concrete. Here is our list.

1). Dust Control

Water keeps the dust from becoming airborne and keeps it from getting inhaled or getting into your eyes. This will save you and the people around you immense health risks. Wet sawing concrete is the safest way to cut concrete.

However, you will need a steady supply of water through a water hose or spray jets to ensure that the disk blade is constantly sprayed with water so the dust particles don’t become and airborne.

Why Need Water Supply Concrete Cutting workers

2). Heath And Safety Reasons 

Having enough water supply while cutting concrete keeps the concrete saw operator and the workers around him safe from inhaling crystalline silica which can cause severe and irreversible damage to the lungs.

Spraying water on the concrete blade while cutting also keeps dust particles from entering the eyes causing severe eye damage.

3). Keeping The Concrete Saw Blade Cool

Cutting through concrete is tough for the saw blades. Concrete is a hard and sturdy material. Cutting through concrete takes its toll on concrete blades. It can cause overheating which can cause the blades to crack or break.

Keeping the blades cool with the constant spraying of water while it cuts through concrete will minimise the effect of wear and tear and will significantly improve or prolong the lifespan of the blade and the concrete saw in general.

4). Environmental And Legal Guidelines

Concrete cutting in enclosed areas must only be done by wet sawing. Dry sawing concrete in this area can cause suffocation from the dust, lung damage, and many other fatal effects.

5). Reduced Noise Pollution

Wet sawing produces less noise from the concrete saw because the water keeps it relatively quiet.

This is important especially if you are working in enclosed spaces or buildings where there are other businesses and people who could be inconvenienced by the noise.

Why Need Water Supply Concrete Cutting

6). Preventing Flying Debris

When cutting concrete, small and sometimes large particles of concrete can fly through the air.

With a steady jet of water being sprayed on the blade, the water will ensure that any concrete that breaks off while cutting goes straight to the ground away from you and the people you work with.

7). Keeps The Space Clean Before, During And After Cutting

A steady supply of water while cutting helps keep the floor and work area clean and safe for everyone.

The water can be used to clean up before you start sawing the concrete, during, and especially after the work is done. 

Important Reminders:

  • Always check if the hoses are connected securely. Check for cracks, breaks or cuts.
  • Adjust the nozzles so that the water goes directly onto the blade generously and wets the cutting area as well.
  • Always inspect the concrete saw blade before using. Make sure it is in good condition and is maintained regularly. 
  • Always wear your Personal Protective Equipment or PPE from head to toe. Safety first!

Cutting concrete is not a job that should be done yourself if you do not have the experience, the skill, or the training to do it.

Handling concrete saws is challenging and pose so many health risks like losing a limb or worse still, fatally harming yourself. 

For all concrete cutting needs, be it commercial or residential, call us at MEGASAW. We have over 20 years of experience providing quality concrete services in Melbourne. Our experience is your guarantee!

Please call us today on 1300 920 419 or contact us through our website.

How To Keep A Concrete Driveway From Cracking?

Cracking on concrete is normal especially in the first 30 days while the concrete is settling or curing.

If the weather conditions are ideal and your contractors do it right, the cracking should be unnoticeable.

Before we discuss ways to keep driveway concrete from cracking, it is important that you understand why concrete cracks.

  • Shrinkage – the water in the concrete evaporates as it hardens causing it to shrink. When it shrinks, the concrete cracks. Some people add too much water to their concrete mix because it is easier to apply. However, if the concrete dries too quickly, it also shrinks and cracks.
  • Weather – the weather plays an important role in how well concrete cures. Extreme weather (too hot or too cold, too to dry or too wet) and rapid temperature changes affect the concrete and can cause severe cracking.
  • Incorrect spacing of control joints – concrete joints are placed to anticipate and prevent cracking of the concrete. When they are not properly placed and spaced, they don’t work properly which means that cracking will still occur.

Preventing Concrete Driveway Cracking

Concrete is one of the most durable and long-lasting building materials available. You just have to make sure that you follow the proper procedures so it is done right to avoid cracking and other damage.

Here are some things you can do during and after the concrete is poured to avoid mistakes and reduce cracking in the future.

Let the concrete cure properly. Cement (the binding ingredient in concrete) takes a long time to cure so concrete naturally takes a long time to cure. It takes 28 days for it to be completely cured.

Cement needs moisture while curing to fully achieve its maximum strength. This is why concrete cracks easily when it is drying, whether is it drying slowly or quickly.

It will help to spray the concrete with water a few more times a day for seven days so it does not dry up too easily. If the weather is too hot, spray more often.

This will help the cement to gradually build its strength without cracking until the concrete is fully cured.

How Prevent Concrete Driveway From Cracking big cracks

During cold weather, there is no need to spray on water, instead, cover the concrete to keep it from the cold weather for seven days.

After the seven day period, the concrete should be dry and strong enough not to be affected by harsh weather conditions.

Add control joints. Even if concrete is cured properly, there is still a chance of cracking. Temperature changes and drying can still cause it to crack. This is why control joints are crucial.

Control joints anticipate the cracks by putting strategic cracks in advance. These are intentional weak spots to direct future cracks.

Control joints are done in three ways:

  • They can be made while the concrete is still wet using a concrete grooving tool.
  • You can insert joint strips made of flexible wood fibres during the pouring process.
  • Concrete cutting. You can cut them a few hours or a day after the concrete is poured using a diamond saw.

While the first two options are okay but the best way to add control joints is by cutting them in using a concrete saw a day after the concrete is laid.

Cutting concrete must be timed so that you do not cut too soon or too late. When you cut too soon, it will not work since the concrete is still wet.

When you cut too late, the joints will be rendered useless because the concrete has most likely already cracked.

Use the proper amount of water in the concrete mix. Do not be tempted to add more water than what is required just because it is easier to apply concrete when it is wet.

More water content in the mix means more shrinkage. More shrinkage means more cracks. Make sure the base is compact. Concrete cracks because of soil or ground movement.

Avoid this by making sure the ground where you will pour the concrete is compact and can securely support the concrete slab.

How Prevent Concrete Driveway From Cracking pouring

Use reinforcements. Concrete is strong on its own but you can make it ten times stronger by using rebar or steel reinforcements.

Adding steel reinforcements is not complicated and can easily be done. Yes, you may spend extra money on the rebar but this will make up for the cost of fewer cracks and much stronger concrete.

Concrete driveways take on heavy loads and regular traffic. It is important that you keep it strong and crack-free.

Although small unnoticeable cracks are okay, larger ones can damage the integrity of your concrete. Consult your structural engineer on the proper ways to cut concrete to prevent cracking.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

Why Is It Necessary To Put Joints In Concrete?

Concrete’s hardness and high compressive strength is the reason why it is the most popular material in construction. It does not bend or stretch.

However, did you know that these strengths are also a disadvantage? 

Concrete moves, shrinks and expands. And when the concrete is connected or tied to another structure without a break, it can crack when the other structure moves or shrinks or expands.

Cracks can damage the structural integrity of the concrete and will affect the integrity of the whole building. As we can see, concrete’s greatest strength is also its greatest weakness.

When concrete does not have room to move (or expand or shrink), there is ‘restraint.’

Restraint means that the concrete is not allowed to shrink freely as it dries, settle into the subgrade, or contract and expand as the temperature changes.

This can easily be resolved by cutting concrete joints to allow the movements and control the cracking. This will allow the concrete to move independently from the other parts of the slab. 

Aside from preventing or minimising cracking in the concrete, concrete joints can:

  • Give a better finish to concrete (good for aesthetics)
  • Help in locating imminent cracks on surfaces


Joints should be placed to produce panels as square as possible. It must not exceed a length to width ratio of 1.5 to 1.

Concrete joints must be placed on average distances of 24 to 30 times the slab thickness.

Concrete joint spacing greater than 15 feet will require the use of load transfer devices like dowels and diamond plates. The depth must be established at ¼ the thickness of the concrete slab. 


Cutting the concrete joints must be timed right. The concrete joints must be sawed as soon as the concrete can take the force of the sawing without dislodging or ravelling aggregate particles.

On average, concrete joint cutting must be done within the first 6 to 18 hours and must not be delayed more than 24 hours. 

Timing is very important. When cut too soon, the joints are of no use. When cut too late, cracks would have appeared and will render the concrete joints useless.

Methods Of Concrete Sawing:

1). Wet Sawing – This is the most recommended type of concrete saw because it produces less concrete dust.

The water prevents the dust from becoming airborne and inhaled by the operator and everyone in the vicinity. Concrete dust contains crystalline silica which can cause irreversible lung damage.

The water also keeps the saw blade (diamond blade is the best option) cool causing less damage and prevents it from breaking.

2). Dry Sawing – This is better used in outdoor projects. Dry sawing produces a lot of concrete dust so outdoor use is recommended.

Why Necessary Put Joints In Concrete blade

Types of Concrete Saws:

1). Handheld Concrete Saws – this is used for smaller concrete slabs. Handheld saws are easy and convenient to operate and can get to hard to reach areas.

2). Walk-behind Concrete Saws – This is required for larger and thicker concrete slabs. This is mostly used for major construction projects.

However, it is important to have technical knowledge and experience when operating this type of equipment.

Important reminder:

Concrete joints must be planned and designed by a structural engineer. This study is a guide to help you be aware of the importance of concrete cutting. 

The main purpose of putting concrete joints is to prevent cracking. They say prevention is better than cure. In construction, this couldn’t be more true! Fixing major cracks in concrete is expensive.

The worst thing that can happen is having to take down a wall because of severe cracking and then having to install a new one.

This is why concrete joints are an integral part of construction, whether it is for residential or commercial purposes.

Are you building your dream home or a commercial project? At MEGA SAW, we provide professional cutting services for both residential and commercial projects.

With our 20 years of experience in the concrete cutting industry, you can be assured of the highest quality work and service. We can get the job done quickly and accurately. 

We have adjusted the way we do business to make sure we remain COVID-free. With MEGA SAW, you are in safe hands.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

Can You Cut Prestressed Concrete Lintels?

Prestressed concrete lintels are incredibly strong because they are made by casting the concrete around high tensile stretched wires that are anchored into the concrete.

The concrete is compressed by the stress in the wires. This makes it very strong so that it can overcome heavy loads, heavy stress, and lasts longer compared to regular concrete.

You basically have added protection around the concrete so that any stress or heavy load is taken on by the wires before it gets to the concrete.

The reasons for prestressed concrete lintels being so durable and practical are also the reasons why it is hard to cut.

However, they can be cut, preferably by concrete cutting professionals using the right tools and equipment.

Cutting or minor trimmings at the ends are okay and should not cause any problems but cutting near the centre can affect the lintel’s load capacity.

It is important to consult a structural engineer before any cutting is done. Before we go further, we have to consider the following:

  • Are you cutting prestressed concrete lintels that are already installed and part of your building, say a wall or flooring?
  • Are you cutting uninstalled prestressed concrete lintel pieces?

The answer to these questions means varying methods of cutting. However, whether the concrete lintels are installed or not, we highly recommend you hire professionals to do the work and not do it yourself.

Can You Cut Prestressed Concrete Lintels diamond blades

Factors To Consider When Cutting Prestressed Concrete Lintels

  • Type of concrete and reinforcing materials used
  • The design of the lintel
  • Intended purpose and other factors

What You Will Need:

  • A high-speed concrete saw with a diamond cutting disc or blade
  • A 9-inch grinder
  • A cutting or work table
  • Clamps and vices
  • Markers
  • Rulers or measuring tools
  • PPE like a face mask, goggles, gloves, etc.

A high-speed diamond cutting disc must only be operated by a professional who has proper training, experience in handling concrete saws and knows how to operate the equipment, and is fully aware of the health and safety requirements.

It is highly recommended to consult a structural engineer on how to cut, where to cut, and other important details to keep the structural integrity of concrete lintel.

How To Cut:

Step1 – Scour the Line Where You Will Cut

Use the 9-inch grinder to scour the line where you will make the cut. You will need to clean the metal so you can make a clear mark before you can cut the concrete lintel.

Step 2 -Measure and Mark

Based on the advice of your engineer, measure and make clear marks so you can make accurate cuts.

Step 3 – Make the Cut

Position the blade and start cutting. Make sure you have your goggles and other personal protection equipment on. Keep wiring organised and keep all other clutter to a minimum. 

Important Tip:

When cutting concrete, wet cutting is always recommended. It is safer for the diamond blade and for the person operating it.

Wet cutting keeps dust to a minimum and stops it from becoming airborne and getting inhaled. Concrete dust particles have crystalline silica that can cause permanent and irreversible damage to the lungs.

Cutting concrete is tricky enough, cutting a prestressed concrete lintel is even more complicated.

Why risk doing more damage than good by doing it yourself when you can get professionals to do it in a quick and cost-effective way?

MEGA SAW is Melbourne’s concrete cutting and drilling specialist. We deal with all kinds of concrete using top-of-the-line concrete saws and industry-standard equipment and tools.

We have over 20 years of experience and has been the leading expert ever since. Let us help you do the dirty work and we will get it done in lightning speed, quality guaranteed!

We have over 10 fully equipped vans ready to service both major and minor projects. 

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

How To Cut A Toilet Drain Through A Concrete Slab

Drains and pipes for plumbing are usually installed during construction and before the concrete is poured for the building foundations.

This means that a majority of the plumbing connections are inside the foundations.

So when you need to fix or replace a broken toilet drain or if you are installing a new one, it will be necessary to cut through the concrete foundation.

Cutting a concrete slab needs careful preparation and planning. If plumbing lines are housed inside the foundation, it is possible that other utility lines are there too.

Pre-Cutting Preparations

Before you start cutting, make sure you check for the following:

  • Determine the location of the existing plumbing system
  • If the home has in-floor heating, locate the coils to avoid damaging the whole system
  • Locate conduits and electrical lines
  • Get a copy of your home’s mechanical plans

Mechanical plans are filed in your local registry so if you do not have a copy, you can easily request for one from your local authority.

What You Will Need

Most concrete foundations in residential buildings are four-inches thick with steel rebar and steel mesh for reinforcement.

Therefore, in order to access a drainpipe inside a concrete slab, the following equipment and tools will be required:

  • A walk-behind concrete wet saw or hand saw with a diamond blade
  • A small sledgehammer (or pneumatic hammer)
  • A narrow blade shovel
  • Chalk and tape measure
  • Personal Protective Equipment (PPE):
    Goggles or protective eyewear
    Steel-toed boots

Step 1 – Measure And Mark The Cut

Using the mechanical blueprint of your house, measure and mark the area where you will cut the concrete slab for the toilet drain. Make sure that you measure correctly and cut accurately.

It is highly recommended to consult a structural engineer to ensure the accuracy of the cuts and to avoid damaging the structural integrity of the concrete.

How Cut Toilet Drain Through Concrete Slab measure

Step 2 – Cut The Concrete

Set the depth of the diamond blade of your concrete wet saw to 4 ½ inches (for the common four-inch concrete slab foundation).

If your concrete foundation is thicker than four inches, set the depth of the diamond blade half an inch more than its thickness. Cut along the chalk lines to avoid damaging important utility systems.

Do not forget to wear your Personal Protective Equipment when cutting. Cutting through the concrete foundation takes time and energy depending on the thickness and the steel reinforcement used.

The more time you spend on cutting, the more exposed you are to health and safety risks. Protect yourself at all times.

Step 3 – Dig And Clean Up

After cutting the concrete slab, you will need to use your sledgehammer (or pneumatic hammer) to break concrete strips into chunks so you can remove the pieces.

Once you have removed the concrete, dig the remaining trench and remove any sand or soil.

Step 4 – Remove The Broken Drain And Install The New One

Make sure the water is shut off and then remove the broken drain pipe and install the new one.

If you are installing a completely new drain for a new toilet, connect the new drain to the current plumbing system. Secure the drain and pipes to avoid leaks.

How Cut Toilet Drain Through Concrete Slab sledgehammer

Step 5 – Seal The Concrete

Once you have put in the new toilet drain, seal the cut foundation with new concrete. Consult your structural engineer regarding the cement mixture to ensure that the strength matches the original concrete slab.

When it comes to broken plumbing, the need to cut concrete is unavoidable.

For adding new toilets or for any bathroom renovations, if possible, plan the location so that you can run the drain line outside the foundation and tie it into the main drain line in the yard.

Important Reminders:

  • Always consult your structural engineer before cutting concrete slabs especially foundation concrete.
  • Do not operate the concrete saw if you have no experience or prior knowledge in handling the equipment.
  • Always wear protective gear when operating the concrete saw or when you are near the operations.

Cutting concrete foundation slabs is not easy because it requires a walk-around concrete saw (depending on the size of the job).

This is quite a large and intimidating machine that needs experienced hands to operate. That’s why it is highly recommended to let the expert handle this type of job.

MEGA SAW has over 20 years of experience in concrete cutting services. We can get the job done quickly but safely.

We provide a wide range of concrete services designed to make your life easier. We also use top-of-the-line equipment that will ensure quality work and reliable service.

Don’t risk your health and safety. Avoid making more damage to your property too. Leave the work to the experts.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

What Material Can Concrete Cutters Not Cut Through?

Concrete cutters are built to cut through the toughest concrete. Typically, there is no type of concrete they can’t cut. There may be very few exceptions, though like exceptionally hard materials.

However, when you talk about regular concrete and natural stone materials that are often dealt with in construction operations, there is no concrete that most concrete cutters can’t slice through.

Most concrete cutters and saws use industrial-grade diamond blades to cut concrete. Diamond blades can cut through anything that is not stronger or tougher than diamonds.

Diamond is known to be the hardest material on earth. Some concrete – natural or manmade like sapphire, diamonds, metals used in high-grade vaults, etc, may be challenging to cut through but it can be done. 

It is difficult to find any type of concrete that modern cutters cannot cut. Concrete cutting is an innovative industry that is quick to find solutions to any difficult problems.

If there was a material that was difficult to cut, chances are, the industry will invent a new machine to cut through it.

Reinforced Concrete

This is not something your regular concrete saw can cut. Forget about chiselling and jackhammering. Concrete with heavy rebar is tough to cut but a diamond blade can do the job.

A water jet machine can also cut through rebar with precision. Depending on the thickness of the concrete and the quality of the rebars, the cutting may take some time but it is doable.

Ultra-High Performing Concrete

This is a very strong, durable, high tensile ductility and very tough kind of concrete. Only diamond blades can cut through it.

You will need the assistance of a structural engineer in determining the type of saw or cutter you can use, the size of the diamond blade, and other considerations.

This is a challenging material to cut through but with the right equipment and people, it can be done.

High Strength Concrete

High strength concrete can resist strong force without breaking. It has a compressive strength of 6000 psi. That is a tough concrete to crack!

Cutting this type of concrete will require a diamond blade. With professional help and right tools, you can cut through high-strength concrete without too many dramas.

What Material Concrete Cutters Not Cut Through Diamond blade

Sapphire, Diamonds And Other Natural Stones

These natural stones can be cut although it can be very challenging. Diamond cutters can cut through diamonds and gemstones.

However, these stones are not used in construction and building operations. This is not something that we should worry about. The jewellery industry has a solution for that.

Final Thoughts

There is pretty much nothing concrete cutters today cannot cut through. There may be some types of concrete that are harder and take time to slice through but they can definitely be done. 

When dealing with hard and tough materials, even with regular concrete, you should seek professional help. Highly trained technicians can easily do the work for you with precision.

You can save time and money when you entrust the work to the experts.

MEGA SAW has been Melbourne’s #1 concrete cutter for over 20 years now. There is no residential or commercial cutting job that we cannot do. We guarantee the highest quality of work in a fast and reliable manner.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

How Can Water Cut Concrete?

A high-pressure, high flow water jet with an abrasion can cut through thick concrete, even those with heavy rebar. This is usually done through a small orifice like a water hose.

Nowadays, there are water jet cutting machines that can function with a high level of precision. 

Cutting concrete using a water jet has become very popular these days because it can cut through thick slabs of concrete and other thick industrial materials like ceramic, metal, and all kinds of stones.

How Is This Done?

The process simply uses three key elements – water, an abrasive substance, and a high-pressure machine with an orifice like the end of a hose.

It basically works like soil erosion but elevated a thousand levels, accelerated to so many degrees, and concentrated by orders of magnitude.

A water jet is usually used for removing unwanted areas of concrete usually when renovating a house or building, or removing damaged areas. It is also used to expose rebar.

The pressure on the machine can be adjusted according to the need and the work at hand. For example, when exposing underlying support structure, water pressure is lowered so the water jet will only cut through the concrete and not the rebar.

Using water jet for cutting concrete is also called hydro demolition. Hydro demolition is a quicker, more precise and more convenient option than sawing, chiselling, or jackhammering through concrete.

It yields better results and does not cause cracking and chipping so there is less damage to the concrete and the rebar.

How Can Water Cut Concrete slab rebar

Advantages Of Using Water Jet When Cutting Concrete

  1. It is safe. Most water jet machines are robot-operated. It can be maneuvered from a safe distance away from flying debris, dust, and other harmful materials. It can be operated at a safe distance without affecting its precision, control and quality of work.
  2. It gives concrete a smooth edge because it does not stress the concrete. There is no burring, deformation, chipping, cracking or thermal stress. Just clean smooth edges.
  3. It is very versatile. It can cut through curved and flat surfaces, thick or thin. It can even cut through hard to reach areas. Water is easily manipulated and can work well in confined spaces. 
  4. It is fast and efficient. Perhaps the fastest cutting method there is and it does the job with accuracy and precision and fewer errors. Most mistakes happen because of human error so this is all but eliminated.
  5. It saves time and money. Water jet cutting is very affordable. And because it is fast and robot-operated, you get to save on time and labour.
  6. It is environment friendly. 
  7. There is less dust production. 
  8. It keeps the structural integrity unharmed.

Safety Reminder:

Water jet cutters are relatively safe but there are dangers that are still present. Any equipment that can cut through concrete can easily cause bodily harm if safety protocols are not followed.

Always stay safe by following safety guidelines and wearing of personal safety gear. 

Here are some safety rules to remember:

  • Wear the required safety gear before you start the work and make sure everyone within the area does too.
  • When operating manually (no robot), keep your hands/fingers at a safe distance from the nozzle. If the water jet can cut through concrete, it can easily cut your fingers is you are not careful.
  • Wear safety glasses to protect your eyes from abrasive particles. This can cause severe and permanent damage to your eyes.
  • Make sure that the work area is clean from clutter and debris.
  • Keep headcount to a minimum when operating the water jet machine. No bystanders, please!
  • When working outdoors, put up safety covering to control flying debris.
  • Keep covers and guards on at all times.
  • Do not improvise or tamper with the machine.
  • Follow operating procedures and instructions.

When dealing with concrete and machines that can cause severe bodily harm, forget about DIY-ing it! Leave it to the professionals. Hire concrete cutting experts like us, MEGA SAW, to do the hard work for you.

The risk and dangers to your health are not worth the money you think you will save if you do it yourself.

In fact, if you are not familiar with the machine and have no experience cutting concrete, chances are very high that you will cause more damage to the structure. 

Let us take care of the concrete cutting work for you. Our prices are affordable and very competitive and our service is of the highest standard possible.

We have been the leader in concrete cutting and drilling in Melbourne for the past 20 years and use only state-of-the-art equipment for residential and commercials projects.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

How To Cut A Thick Concrete Slab

Cutting thick concrete slabs neatly and with high precision is not an easy task. In fact, cutting any kind of concrete is hard.

You need to have the knowledge, expertise, and experience to be able to do a decent job. It also helps if you have excellent hand-eye coordination and strength. 

Although concrete cutting is best left to the professionals due to the dangerous and vigorous nature of the job, in this article, we will take a look at what is required to cut through a thick slab of concrete.

What Is Needed For Cutting Concrete?

  • For concrete slabs under 10cms, you will need a circular saw with at least seven inches blade, 15 amps minimum. 
  • For concrete slabs thicker than 10cms, you will need at least a 14-inch blade.
  • Markers like chalk or bright coloured crayons or pens.
  • Measuring tools
  • Personal Protective Equipment

How Cut Thick Concrete Slab PPE

Things To Do Before You Start Cutting

  • Clear the area from clutter, obstacles, and anything that can cause harm or accidents.
  • Make sure that other people within the area stay clear from your workspace.
  • If you are using gas or fuel-powered concrete saw, make sure the area is free from anything that can spark or easily combust.
  • If you are using an electric wet concrete saw, make sure your cords, extension lines, etc are waterproof. 
  • Keep your electrical cords organised to avoid tripping yourself and other people involved in the process.
  • Measure properly for accuracy.
  • Make clear marking on the concrete slabs.
  • Consult a structural engineer to make sure that your measurements are correct.
  • Always wear protective gear.
  • Follow safety protocols.
  • Check the concrete saw. Make sure it is in perfect running condition.
  • Ground fault circuit interrupter-protected extension cord.

Where To Cut?

Depending on the thickness of the concrete slab, the cuts must be spaced between 24 to 36 times the slab thickness.

And depending on the amount of reinforcement the concrete slab has, control joint spacing is normally set at 3 to 5 metres apart. You can reduce the cut spacing for high-shrinkage concrete. 

A good rule of thumb is cutting the concrete slab a quarter or a third of the slab thickness. So for a 25cm concrete slab, you cut 5 to 6cms. 

How Cut Thick Concrete Slab Sawing

How To Cut?

  1. Layout the joints to be cut. Clear your workspace. Get rid of any clutter and debris that can hinder the smooth operation of the concrete saw or cause any accidents.
  2. Mark properly using bright-coloured chalk or pens. Make the lines as thick as possible. Make sure that you use a good marker so the marks will not wash away especially when you are using a wet saw.
  3. If you are using a wet saw, check and make sure the water runs all the way down to the blade. A wet saw with a diamond blade is highly recommended for a smoother and safer job.
  4. Position the blade against the slab and start following the marked areas. Take your time and go easy on the blade.
  5. Do not push the blade too hard, just guide the blade and let it do its job.
  6. Use a guide board and start at one end of the cutting area, whichever is easiest for you. 
  7. When done, remove the saw from the concrete and let it spin freely for a minute to spit out any dust or particles and to cool the blade down. Repeat the process until all cuts are done.
  8. Allow 30 to 40 seconds in between cuts to let the blade cool down. 
  9. Unplug the concrete saw when done. Clean it and tuck away all tools. 
  10. Clean the area and get rid of the dust and water. 

Safety Equipment

Cutting concrete is not an easy job. You put yourself in harm’s way every time you operate a concrete saw. Protect yourself at all times.

Losing a toe or a finger is a real danger that goes with the job. Educate yourself in proper handling and operation of concrete saws. Wear the required personal protection equipment or PPEs.

Safety first, at all times. Better safe than sorry!

Important cutting tips:

  • Do not push the blade too hard.
  • Do not twist the blade.
  • Do not let the blade spin in the cut.
  • Use blades with soft metal segment bonds when cutting concrete with heavy rebar.
  • Do a safety check on your concrete saws before and after using.

Cutting concrete is a job for trained professionals so it’s safer to leave it to the experts. That’s where Megasaw comes into the picture.

We service residential and commercials projects, delivering only the best concrete cutting and drilling solutions for our clients.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website.

How To Cut Concrete To Make A Door Opening Square? 

Sometimes it is necessary to have to cut through old concrete walls when renovating. Although it is ideal to cut concrete within a few hours after it is poured, it is still possible to cut through old concrete without causing too much damage, if any at all.

When cutting concrete walls, you have to consider a few things:

  • Ductworks
  • Electrical conduits
  • Piping
  • Mechanical and electrical systems
  • Other building materials that run your walls

It is important to know what is inside your walls before you start cutting. By doing so, you avoid damaging any important pipes and lines saving you time and money in repairs.

Once you have mapped out the cables and pipelines inside the concrete wall, it is time to determine the right tools and equipment to use. 

Things You Need

  • Chalk or Marker
  • Straight edge
  • Tape
  • Plastic Sheets
  • Tape Measure
  • Rotary Drill
  • Sledgehammer
  • Concrete Saw (preferably diamond blade)

Then most importantly, you must make sure that you use the right PPE or Personal Protective Equipment:

  • Respirator
  • Goggles
  • Face Mask
  • Ear Protection
  • Helmet
  • Coveralls
  • Gloves
  • Safety Boots

Now It’s Time To Cut!

Now that you have everything you need, you are ready to cut through the concrete wall. Remember not to rush and follow these steps:

  1. Mark the space on the wall where you plan to cut the square opening. Make sure you do not cut on an area where there are any utility lines. Use a tape measure to ensure you make accurate, straight cuts. 
  2. Do the same on the other side of the wall. Make sure that both sides have the same measure and are on the same level.
  3. Cover all entrances with plastic sheets and tape them in place to make sure that the dust is contained within the area. Cover all furniture, fixtures, and other items in the area to protect them from the concrete dust during cutting. 
  4. Ensure proper ventilation.
  5. Drill through each corner of the square outline using a masonry bit and rotary hammer. The holes will mark the boundaries of the outline and help guide you when sawing.
  6. Start cutting using your concrete saw. Start sawing over the marks on one side of the wall. Carefully cut along the lines. Start with shallow cuts.
  7. Do the same on the other side of the wall. Start with slow and shallow cuts.
  8. Knock the cut concrete slowly using a sledgehammer. 
  9. Chisel out any remaining concrete from the edges of the square opening.

Important Reminder:

Consult your structural engineer regarding your measurements and process of cutting out the square opening on your concrete walls before you start cutting out a new door. 

Safety Reminder:

DO NOT forget to wear your personal protective equipment. SAFETY FIRST!

Important Tips:

  • Use the wet sawing to minimise concrete dust. Wet sawing also keeps your saw blade from overheating. Overall, wet sawing is environment-friendly, more effective, and efficient.
  • Do a regular check and maintenance on your concrete saw. Do not use your saw unless it has been checked for any potential safety issues. 
  • Keep your work area clean and free from debris and anything that can trip you or cause any accidents.
  • Turn off and unplug any devices when not being used.
  • Make sure you know how to operate a concrete saw before you decide to do it yourself.

Get the Pros

For most projects, it may seem cost-effective to do it yourself. That is not true for concrete cutting. Handling the concrete saw itself is a challenge and very dangerous.

And if you are not an expert concrete cutter, you may cause damage to your walls and end up spending more money on repairs. Renting equipment is expensive too. So, leave it to the pros.

By hiring professional concrete cutters, you pay a one time fee with a guarantee that the work will be done properly and will be done on time. There will be no re-dos and delays, no damages, no extra time for repairs. 

Professional concrete cutters can do quick but precise cutting. This will make your renovation project run smoothly and without any delays. The best part is, you do not have to lift a finger or risk losing one.

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website

Can I Purposely Put A Controlled Crack In Concrete? 

Concrete cracks. It is unavoidable. However, cracking can actually be controlled and minimised. How? By cutting and putting a controlled crack before the concrete cracks on its own.

By cutting the concrete in strategic areas, you preempt random cracking and keep the integrity of the concrete – visually and internally. 

The cuts you make on concrete to actually prevent cracks are called “control joints.” The depth and length of the control joints will vary depending on the type of concrete and its usage.

Making the cuts needs to be precise and timely. Otherwise, you will cause more harm than good.

When To Cut Concrete?

Timing is important when it comes to cutting control joints into the concrete. If you do it too soon can it cause ravelling which causes the aggregates to be pulled out of position, weakening the edges of the concrete that was cut.

On the other hand, cutting too late can cause even more cracking. When it comes to cutting concrete, you have to consider the following factors:

  • The concrete mix
  • Aggregates used
  • The hardness of the concrete
  • The type of equipment used
  • Weather conditions – if the weather is hot, you can start cutting as early as four hours after you pour the concrete. If the weather is cool, cutting needs to start 12 hours after the concrete was poured.

Cutting Tip:

The best way to determine if the concrete is ready for cutting is to make test cuts to check for ravelling. When the ravelling stops, you should start cutting.

Where to Cut Concrete to Prevent Cracking?

Cutting control joints should be strategic, otherwise, cutting is useless. Always consult a structural engineer before making the cuts.

Usually, control joints should be spaced at 24 to 36 times the thickness of the concrete. They should be spaced between 4 to 6 metres depending on the amount of reinforcement the concrete has.

You also have to consider the shrinkage of the concrete. This is why you need to consult your structural engineer when making the cuts.

Concrete Cutting Tips

Once you have determined the right time to cut control joints into your concrete, complete the following steps:

  • Mark the areas you are going to cut. Use bright chalk powders to mark the areas. If you are wet-cutting, use a bright-coloured crayon to mark the spot.
  • Use the right saw for the type of concrete you are cutting. There are various types of concrete saws you can use in cutting concrete. For example, large floors will require the use of a walk-behind saw. For smaller concrete, hand-held concrete saws can come in handy. 
  • Choose the right saw blade. Diamond blades are more popular and highly recommended. They make more precise, clean cuts and produce less concrete dust.
  • Control the dust. Make sure you have dust collectors and other necessary tools in controlling dust. Concrete dust contains crystalline silica which is very harmful to your health. Crystalline silica can cause lung scarring and can cause Silicosis, a fatal, incurable, irreversible disease. Use the wet cutting method when making control joints. Wet cutting produces less dust and keeps the concrete dust from becoming airborne and getting inhaled.
  • Use waterproofed, GFCI extension cord when using electric saws. GFCi or Ground Fault Circuit Interrupter is an affordable device that is built into your power cord to protect you from power surges, overloads, and electric shocks. 
  • Use a guide board. Secure a straight smooth board outside the chalk line to use as your guide in making straight, clean lines. 
  • Do not force the blade. Do not push too hard. Just let the saw do the work. All you need to do is guide it in the direction you want to cut. Pushing the saw too hard can cause overheating and can damage the saw.
  • Try to form square patterns.
  • Make shallow continuous cuts.
  • Do not twist the saw blade. You will damage the blade, jeopardise the finish of concrete, and put yourself in harm’s way.
  • Use saw blades with soft metal segments when cutting concrete with heavy rebar.
  • ALWAYS use the required PPE or Personal Protection Equipment. The Australian Code of Practice for Concrete and Masonry Cutting and Drilling requires the use of the following:

Safety helmet

Safety footwear – steel-toed shoes are recommended

Safety goggles

A face shield

Hearing protection

Sun and weather protection

Gloves to improve hand grip  and reduce force and vibration

Respiratory protection when hazardous dust or fumes  cannot be eliminated

  • Avoid using loose-fitting clothing or jewellery. Long hair and long beards can be risky too.

Cutting concrete yourself is doable but we do not recommend it. Aside from the health risks, your lack of training might just cause more damage to your concrete and cost you thousands of dollars in repairs. Let the professionals handle the work for you. 

If you are looking for a specialist concrete cutting company who uses only the best practices to get the job done right, then please call us at Megasaw on 1300 920 419 or contact us through our website

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