![]() ![]() ![]() If you are going to include stones or larger aggregate, then the mixture should be: Since your overlay material will be mixed most likely in a wheelbarrow or a rented mixer, be sure that you include 1 measure of Portland cement for every 2.5 measures of sand for thin overlays. It is important that a sufficient amount of cement is added to the overlay mixture so that it will resist freeze-thaw cycles that will occur in the winter months. How Much Portland Cement Should be in the Overlay Mix? Add enough water to the cement and mix it until it is the consistency of regular latex wall paint. Cement paint is simply a mixture of Portland cement powder and water. In addition, a liquid bonding agent or traditional cement paint can be brushed onto the damp slab immediately prior to pouring the overlay. The overlay mixture will bond permanently to the existing concrete slab, if you make sure the existing slab is clean, dust-free and slightly damp before you apply the overlay. These conditions can also cause undesirable plastic shrinkage cracks in the surface of the brand new overlay.ĬLICK HERE to get FREE & FAST BIDS from local concrete resurfacing contractors. Rapid drying makes it harder to work and finish the overlay. Heat, sunlight, and wind cause the overlay mixture to dry too rapidly. It's even better if there is little or no wind and the skies are overcast. Cool days with temperatures in the 50 F range are ideal. Weather conditions also impact the success of the overlay. What is the Best Weather to Install a Concrete Overlay? If the slab sounds solid and it is difficult to do further damage to the slab with moderate hammer blows, the existing concrete is probably a superb candidate for an overlay. Tap the damaged areas moderately with a hammer. Be sure that the exposed parts of the slab are not crumbling. You must determine that the existing slab is sound. The secret to success is a combination of ingredients. Cement or concrete overlay thicknesses can range from 1/4 inch thick up to a full 2 inches or more. The overlay material can be a simple mixture of sand and cement or it can actually be a real concrete mixture that includes small pieces of stone or even large stones depending upon the thickness of the overlay. Residential contractors and large-scale commercial concrete contractors can install a thin overlay on concrete slabs that have damaged surfaces. There are many things that could have gone wrong that most likely caused the concrete wear surface to fail, but the good news is that there is a repair method that will yield long-lasting and beautiful results.Ĭan a Thin Overlay Be Applied to Concrete? Extra water could have been added to the entire mix when the truck arrived at the job site. The most common reason for concrete spall is water was sprinkled on the concrete during the finishing process. Copyright 2018 Tim CarterĭEAR BETTY: What a shame! Exterior concrete that is ordered, mixed, installed, finished and cured properly can withstand many, many years of exposure to road salt and freeze and thaw cycles that occur during cold winter months.ĬLICK HERE to get FREE & FAST BIDS from local concrete resurfacing contractors. I talk to Vic about how he can do a concrete overlay to SAVE thousands of $$$. More Concrete Restoration Professional TipsĬLICK this image and listen to the first call on the podcast. Wayne, INĬoncrete Resurfacing Tips & Tricks - DO NOT SHARE! Is it possible to patch the concrete with some mixture that will last for a long period of time? If so, how is the task completed? Is this a task that the average person can tackle? Betty G., Ft. The contractor I used blames road salt for the damage. For some reason, the top 1/8 to 1/4 inch of the finish surface has peeled up in patches. Cover the overlay with plastic to cure it for 48 hoursĭEAR TIM: My concrete sidewalks and driveway look horrible.Dampen old concrete slightly before applying the cement paint.Use secret cement paint to bond overlay to the old concrete.Overlay stones no larger than 1/3 thickness of the overlay. ![]() "In addition, a liquid bonding agent or traditional cement paint can be brushed onto the damp slab immediately prior to pouring the overlay." Concrete Overlay Installation Checklist There's a nice coat of cement paint that bonds the new overlay to the old concrete. ![]() You can see the form boards that allow you to get the top in the same plane. Here's a concrete overlay on a small concrete slab. ![]()
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