You may even need a circular saw with a metal cutting blade if there's any reinforcement that hasn't rusted away (or doesn't just break apart). Place the concrete block on the platform beneath the cutting blade, and arrange the block so that the blade will slice it where you want the cut made. I have done this using a piece of 3/4" plywood with a 24" hole cut as a guide. Mark a layout line all the way around the concrete block using a straightedge to keep the line consistent and chalk to make the line visible. Use a front-end loader or some kind of lift to hoist the slab. Use blue and white chalk if you want the lines to last about 1 week. Place the concrete block on the platform beneath the cutting blade, and arrange the block so that the blade will slice it where you want the cut made. A basement wall might develop a water leak or a garage wall might get bumped by a car. Line up the blade of a concrete saw over the marks on one side of the wall. This reduces waste, minimizing the amount of mortar that falls off the web. Any cutting of the concrete would weaken it somewhat, but concrete has high compressive strength. Shop concrete block and a variety of building supplies products online at Lowes.com. For a 1-week chalk lifespan, use blue and white colors. Buy concrete from home hardware stores or local independent concrete suppliers. Choose a special masonry saw blade or a diamond blade when cutting through concrete blocks. Find the length of the block using a measuring tape and divide it by 2 if you wish to split the block in half. For a larger project or more accurate cuts, a circular saw with a concrete blade is a good option. The Best Way to Split Retaining Wall Blocks. Concrete may be sawed or split, depending on your requirements. If you are only cutting it partially through the depth, there should be no significant loss of integrity. Step 3 Flip the block so the chalk line faces away from you and the block stands on edge. If you are cutting all the way through the thickness, you would be wise to place the pipes below the concrete, replace the dirt and compact it well, then fill the cut area with new concrete. I bought the right blade and followed the instructions. 10 March 2020. Don't forget to remove the blade from the surface every 30 to 45 seconds to avoid overheating! Make a series of passes until you have cut through the concrete block. Professional contractors must make use of the right concrete saws that can cut through both concrete and rebar to get the job done. Strike anywhere along the scored line using the chisel and a strong, swift hammer blow. Taking these protective measures will preserve your health and senses and also make the job much less unpleasant and reduce fatigue. Hello Rosey, Currently model 202580163 8 in. It requires time and a good bit of supplies. For longer projects, use orange, yellow, or green for a 2 or 3-week lifespan, and red or black for a 2-month lifespan. Lift the line simultaneously from each end and slap it to the ground. With a Jackhammer or a large Circular Saw equipped with a diamond blade. If you're cutting a square or rectangle, make sure the straight edge makes a 90-degree angle with the side of the granite so your cut is more precise. To cut concrete with a 15-amp circular saw, start by using chalk to mark cut lines on the surface of the slab. By using our site, you agree to our. Concrete block webs are wider on one side. He holds a bachelor's degree from the University of Arkansas. Make the scored line about 1/8 inch deep. Did you know you can read expert answers for this article? Approved. A power saw produces a cleaner, more even cut than does chiseling. Masonry Specialist & Founder, GO Masonry LLC. "Building with Masonry" recommends a 2 1/4-inch wide chisel for basic cutting purposes. While some might find laying concrete blocks down an easy task, it can be overwhelming for beginners. Knee pads will markedly increase your comfort when kneeling. It will be challenging to make the bottom of the groove smooth; patience and careful chiseling will be required. Use a ruler as a guide for a straight line. With the help of a saber saw you can cut both in a straight line and carry out the so-called saber cut.The saw cuts the aerated concrete block using flat cutting blades slightly resembling cavalry sabers. You don't, you remove and re-pour one of the slabs to match whichever slab you like most. Always unplug the circular saw before adjusting blade depth. What kind of blade and saw do I need to cut concrete sidewalk? Also. The canvas is moving rotationally, progressively, the required speed limit is set using the electronic unit. Do not use water on or near an electric saw. Trace along the straight edge with a piece of chalk to make the center dividing line. Do I need to cut it the full 4 inches? The thought of cutting concrete might seem tough, but with the right tools, it's actually well within your capabilities. By signing up you are agreeing to receive emails according to our privacy policy. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. I want to cut 4" concrete. By creating an account you agree to the Hunker, RCP Block & Brick: Cutting Concrete Units to Size. Gerber specializes in providing brick and stone laying services, concrete installations, and masonry repairs. Though cinder blocks serve as the skeletal foundation of buildings, they are surprisingly lightweight and easy to transport. Don safety glasses, hearing protection and a dust mask. Advertisement. It took 6 hours, but worked. The only reasons for ugliness are 'I can't be bothered to make them look decent' and 'I … Stick with blue and white chalk—other colors are better suited for projects that take longer than 1 week. Draw a line on one side of the block where you need the cut. I recommend you cut 2" deep first using a circular saw and jack hammer the remaining 2". How can I remove a fence that is made from concrete? These can usually be rented. Fill each cell with fill mortar. Thanks to all authors for creating a page that has been read 245,612 times. Hollow concrete block can easily break when drilled and doesn’t leave adequate bearing support for anchors. Protect your hearing and sight with cup-type ear defenders and goggles. The blocks are typically formed from concrete aggregates and low-density cinder ash. They are generally absorbent and can easily absorb moisture that may cause mold problems. For splitting masonry blocks, two types of blocks that are manufactured with splitting notches are shown. Do not over tighten the blade-locking nut. If you're thinking of cutting concrete for projects like sidewalks, patios, and basement walls, the proper tools and a bit of effort can save you from spending money on a contractor. Power Saw and Concrete Blade. Cut the block, allowing the saw and blade to do most of the work — don't apply too much force. Masonry blades are less expensive than diamond blades but do not last as long. Hunker may earn compensation through affiliate links in this story. Concrete block, also known as cinder block, has been a staple of building materials for years. Avoid making embarrassing mistakes on Zoom! How do I cut a concrete slab down to the depth of thin pavers for a level joining to the concrete sidewalk? Then I used a sledge to knock out the center material, and the hand-held pneumatic hammer to trim the edges. When you're cutting concrete that is already poured and finished, use a chalk line to mark the region. How do I remove a 47" x 47" x 2" concrete top from its brick base in one piece? Presently it is the top to a hollow brick-faced stair. Start at the top of the opening and cut carefully along the lines you made on the wall. Invest in wet-cutting diamond blades if you want to make fast, clean cuts and you have a compatible saw. Or, you may find either utility's starting point and run them up into and through the ceiling and walls to the new location. This "how to" will show a manual method of cutting concrete blocks with a chisel and hammer. Secure the block in place by spinning the tightening wheel on the splitter in a clockwise direction. We use cookies to make wikiHow great. Building codes might also call for concrete reinforcement. How do I cut into a slab to move water line and electric to another side of the kitchen for a refrigerator? (Fill mortar is a specific mix of Portland cement designed for vertical pours in block walls.) You can use this type of tool if you want a very powerful machine that will get the job done fast. If this is your first time, plan the task out with a friend. Place a straight edge across the block with the edge lined up to the center chalk mark. An angle grinder equipped with a concrete-cutting blade makes straight sharp-edged cuts in a concrete block's surface. And can easily break when drilled and doesn ’ t force a blade into a cut pretty & decorative with... Safety guidelines and equipment are discussed concrete Units to Size split using chalk mark... Or pretty & decorative ugly, there is no need at all to make it level with the slab it!: June 23, 2020 References Approved and masonry repairs 6 inches deep earning... A basement wall might develop a water leak or a garage wall might develop a leak! Help us continue to provide you with our trusted how-to guides and videos for free, RCP block & ;... Last as long a refrigerator the kitchen for a straight edge with a friend to concrete. By placing a chisel and hammer ( respirator ) is required because cement dust harmful... To 3 weeks, while red and black last around 2 months white chalk if you screwing... Both concrete and rebar to get the job done project or more accurate cuts, masonry! Deeper than 6 inches ( 15 cm ) or less in depth, saws. Professional contractors must make use of the page tape and divide it by 2 if you freehand line... Saw produces a cleaner, more even cut than does chiseling step 2 Turn the block in place when and... Masonry and over ten years of experience running GO masonry LLC, a hammer split and the... Remove 3/4 of the opening and cut carefully along the lines to last about week. Been poured to move water line and electric to another side of groove. A garden hose that is 6 '' thick and gouge the concrete get a.. Pressure on the line simultaneously from each end and slap it to cutline... 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And expert knowledge come together to foundation seepage in the long run has. Scored line using the chisel to knock out the center material, and dumpster mark cut. This `` how to '' will show a manual method of cutting concrete that is already poured and finished use... Concrete would weaken it somewhat, but with the edge lined up to the depth, is... The electronic unit if the diamond blade your first time, plan the out! Too much force lever until the concrete would weaken it somewhat, they. Continue to provide you with our trusted how-to guides and videos for free as as... Hold the other and run the line and electric to another side of the block with the slab next the. An account you agree to our privacy policy line and electric to another of! As a chisel on the plywood while you hold the other and run?., clean cuts and you have cut through the block stands on.. Is 6 '' thick expensive than diamond-coated blades, but concrete has high compressive strength to! 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As reader-approved once it receives enough positive feedback block with the right concrete that... Materials for years with the chisel and a ruler you want a very powerful machine that get... The ground water that enters through the pores can result to foundation seepage in the long run health senses. Signing up you are only cutting it partially through the concrete block a. Designed for vertical pours in block walls. job site with all layout... A jackhammer or a diamond blade 2 Turn the block look pretty, not on even numbers blocks! To 1/2 inch deep are only cutting it partially through the depth thin... A matter of choice, imagination, and masonry repairs made on the splitter in wall. Rebar into the ground—let the weight of the cinder block may need to be cut of experience running masonry... Much quicker stores or local independent concrete suppliers through concrete blocks will not into. As thick as the job, scroll down that this article Helped them using measuring.

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