Mar 26, 2013 This video shows a DIY alternative to crack injection and excavation as methods of sealing leaking cracks in block and poured concrete in basement walls.
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Most concrete block, or cinder block, walls stay as is if used as retaining walls or foundations, but some serve as a finish wall as well. Garage walls are a perfect example of this. If you wish to preserve the new installation look over time, the best option is to seal the block to keep moisture and mineral buildup to a minimum. The process is exactly the same as sealing slabs or tile floors, with the end result being a block wall that will stand up to the test of time without discoloring.
1
Give the entire block wall surface a thorough sweeping with a stiff broom to clean off dirt, debris, cobwebs and other buildup that can impede the penetration of the sealer. Alternatively, you can sweep the surface with a shop vacuum.
2
Ventilate the area. Open all windows and doors to the garage. Place drop cloths around the entire perimeter to protect the floor from sealer overspray or drips during application.
3
Apply the sealer with a paintbrush to the inside corners as well as the perimeters of the wall, roughly 6 inches out from the corners and where the wall meets the floor and ceiling. Follow this up by applying sealer with a paint roller across the center of the wall up to your brushed areas.
4
Cover the block wall with a sprayer if you want to work more quickly. Fill the reservoir of the machine with sealer. Pump the handle up and down to pressurize the container. Hold the nozzle roughly 12 to 18 inches from the surface of the blocks and pull the trigger. Adjust the nozzle until you have a thick mist coming out of the end. Evenly coat the wall.
5
Follow the manufacturer’s directions for the number of coats and drying time. These factors differ between the various brands and types of sealer.
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About the Author
Tim Anderson has been freelance writing since 2007. His has been published online through GTV Magazine, Home Anatomy, TravBuddy, MMO Hub, Killer Guides and the Delegate2 group. He spent more than 15 years as a third-generation tile and stone contractor before transitioning into freelance writing.
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Anderson, Tim. 'How to Seal a Cinder Block Garage Wall.' Home Guides | SF Gate, http://homeguides.sfgate.com/seal-cinder-block-garage-wall-45945.html. Accessed 28 August 2019.
Anderson, Tim. (n.d.). How to Seal a Cinder Block Garage Wall. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/seal-cinder-block-garage-wall-45945.html
Anderson, Tim. 'How to Seal a Cinder Block Garage Wall' accessed August 28, 2019. http://homeguides.sfgate.com/seal-cinder-block-garage-wall-45945.html
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Written by Thomas Ferraioli; Updated December 06, 2018
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Whether found in drywall, plaster or concrete, a crack in a wall is an eyesore. Generally caused by the natural settling of a house over time, you can repair a cracked wall in a weekend. Simple tools and materials from your local home improvement store will have you on your way to a smooth wall. Take note, though; if drywall cracking or surface distortion is severe or there are other indications of significant settling or potential structural problems, have your home inspected by a qualified building professional before repairing the drywall.
Fixing Drywall
Fixing a crack in drywall is the easiest of the three wall types you are likely to encounter in your home. Use a utility knife to cut a 1/8 inch to 1/4 inch V-notch along the length of the crack. Vacuum out loose material. Cover the crack with either mesh joint tape or joint compound and paper tape, followed by a thin layer of joint compound, extending about 2 inches on each side of the tape. Allow to dry. Apply a second coat of joint compound, feathered approximately 6 to 7 inches on either side of the crack. Allow to dry overnight. Lightly sand until smooth. The wall is ready for paint or wallpaper.
Plaster Wall Patching
Treat minor cracks in plaster similar to a drywall crack, with joint compound. However, if the plaster is pulling away from the lath, you first need to shore up the wall with a two-step process that includes a conditioner spray followed by adhesive. Start by drilling holes with a 3/16-inch masonry bit that will penetrate the plaster but not the wood lath, every three inches along the length of the crack. Vacuum the dust and debris from the holes. Spray the adhesive conditioner into each hole. Allow dwell time as per the manufacturer's instructions. Inject the adhesive into each hole, beginning at the lowest point of the wall. Clean up excess adhesive with a damp sponge. Immediately attach plaster rings with a drill to pull the plaster tight against the wall. Allow to cure as per the manufacturer's instructions. Remove the plaster rings. Hide the holes and original crack with a coat of joint compound. Lightly sand, then apply a second coat of joint compound. Sand smooth when dry.
![]() Concrete Walls
To repair a concrete wall you will need an epoxy repair kit. The epoxy will make a watertight seal in the crack. Begin your repair by tapping 3-inch finish nails partially into the crack every 12 inches; these nails will attach injection ports. Epoxy comes in two parts, A and B, which you need to mix just before using. Mix equal parts of the epoxy on a scrap piece of wood with a putty knife. Apply a small amount of mixed epoxy on each injection port tab; attach each port against the wall by covering each of the finish nails with one port. Spread mixed epoxy over the crack, extending 1 inch on either side of the crack. Cover the flange of each injection port with epoxy as well. You can use a paintbrush dipped in mineral spirits to feather the epoxy at the edges. Allow to cure for six to 10 hours. Using a caulk gun, inject liquid concrete repair into the ports, starting at the bottom, until the liquid oozes from the port. Plug each port before moving to the next. Allow to cure for at least five days, then cut the port flush with the wall with a hacksaw.
Repairing Deep Cracks
If cracks in drywall or plaster are deeper than a 1/4 inch, you will have better success if you first fill the the crevice with a filler compound prior to taping with joint compound. Mix the compound as per the manufacturer's instructions. Fill the crack until it is flush with the existing wall. Cover with tape and joint compound, as outlined previously, to achieve a smooth wall.
Signs of Structural DamageSealing Cracks In Basement Block Walls
Concrete walls, especially in a foundation, are load-bearing walls. Although you can patch minor cracks, major fissures can be a sign of poor structural integrity. A horizontal crack that stretches the length of a wall as well as bulging is a tell-tale sign of serious damage. Cracks of this nature should be repaired only by a professional.
Repairing Cracks In Concrete Block WallReferences (4)About the AuthorRepair Cracks In Block Wall
Thomas Ferraioli began writing in 1993. His work has been featured in national publications like 'Parents' and 'U.S. Catholic.' Ferraioli owns a cleaning service and is a Catholic youth minister. He holds a bachelor's degree in communications and business from Seton Hall University and was a recipient of the Pope John Paul II Award from the Archdiocese of Newark, N.J. for his work with youth.
Cite this Article
How To Fix Foundation Cracks In Block WallsChoose Citation StyleFixing Cracks In Masonry Walls
Ferraioli, Thomas. 'How to Fix Cracked Walls Permanently.' Home Guides | SF Gate, http://homeguides.sfgate.com/fix-cracked-walls-permanently-57017.html. 06 December 2018.
Ferraioli, Thomas. (2018, December 06). How to Fix Cracked Walls Permanently. Home Guides | SF Gate. Retrieved from http://homeguides.sfgate.com/fix-cracked-walls-permanently-57017.html
Sealing Cracks In Basement Block Walls
Ferraioli, Thomas. 'How to Fix Cracked Walls Permanently' last modified December 06, 2018. http://homeguides.sfgate.com/fix-cracked-walls-permanently-57017.html
Filling Cracks In Cement Walls
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