Concrete Floor Leveling

responsive

Concrete Floor Leveling

In this video, This Old House general contractor Tom Silva shows how to resurface an uneven concrete slab. Steps:1. Lay long, straight 2×4 rail across the concrete-slab floor, with one end positioned on the high point in room.2. Slip shims under the low end of the 2×4 rail until it’s perfectly level.3. Use a scribing tool to transfer the unevenness of the floor onto the rail.4. Cut the rail along the scribed line with a circular saw.5. Set the scribed 2×4 rail back into position on the floor and check it for level. If necessary, scribe and cut it again.6. Secure the scribed rail to the slab with construction adhesive.7. Bore pilot holes through the rail and into the concrete using a hammer-drill fitted with carbide-tipped masonry bit.8. Fasten the rail to the slab with masonry nails.9. Lay a second 2×4 rail across the floor, setting one end on top of the first rail.10. Shim the second rail level.11. Adjust the scribing tool to the height of the second rail, then draw a short reference line onto the second rail.12. Widen the legs of the scribing tool to span from the floor up to the reference mark.13. Guide the scribing tool along the floor to transfer its unevenness onto the second rail.14. Repeat Steps 4 through 8 to level, trim and install the second rail.15. Cut a third 2×4 rail to span across the two previously installed rails.16. Adjust the scribing tool to the height of the rail underneath one end of the third rail.17. Draw a short reference line onto the third rail, then adjust the scribing tool to span from the floor up to the reference mark.18. Follow the floor with the scribing tool to mark a cut line along the third rail.19. Cut and install the third rail, just as you did the previous two rails.20. Use a ½-inch drill fitted with a mixing paddle to mix a bucket of leveling compound.21. Slowly pour leveling compound inside the perimeter of the rails.22. Strike off the excess compound and level the surface using a screed made from a 6-inch-wide straight-edged board. Allow the leveling compound to cure overnight.23. If necessary, repeat this process to level the floor in other parts of the room.

Concrete Floor Leveling

Steps:1. Lay long, straight 2×4 rail across the concrete-slab floor, with one end positioned on the high point in room.2. Slip shims under the low end of the 2×4 rail until it’s perfectly level.3. Use a scribing tool to transfer the unevenness of the floor onto the rail.4. Cut the rail along the scribed line with a circular saw.5. Set the scribed 2×4 rail back into position on the floor and check it for level. If necessary, scribe and cut it again.6. Secure the scribed rail to the slab with construction adhesive.7. Bore pilot holes through the rail and into the concrete using a hammer-drill fitted with carbide-tipped masonry bit.8. Fasten the rail to the slab with masonry nails.9. Lay a second 2×4 rail across the floor, setting one end on top of the first rail.10. Shim the second rail level.11. Adjust the scribing tool to the height of the second rail, then draw a short reference line onto the second rail.12. Widen the legs of the scribing tool to span from the floor up to the reference mark.13. Guide the scribing tool along the floor to transfer its unevenness onto the second rail.14. Repeat Steps 4 through 8 to level, trim and install the second rail.15. Cut a third 2×4 rail to span across the two previously installed rails.16. Adjust the scribing tool to the height of the rail underneath one end of the third rail.17. Draw a short reference line onto the third rail, then adjust the scribing tool to span from the floor up to the reference mark.18. Follow the floor with the scribing tool to mark a cut line along the third rail.19. Cut and install the third rail, just as you did the previous two rails.20. Use a ½-inch drill fitted with a mixing paddle to mix a bucket of leveling compound.21. Slowly pour leveling compound inside the perimeter of the rails.22. Strike off the excess compound and level the surface using a screed made from a 6-inch-wide straight-edged board. Allow the leveling compound to cure overnight.23. If necessary, repeat this process to level the floor in other parts of the room.

Concrete Floor Leveling

responsive

Though concrete floors are durable, your floor may develop problems over time. It may not be quite level or may have dips in the surface, which can make it difficult to walk across the floor or to add a new floor covering, such as tile. Releveling a concrete floor is something that you can do yourself and is easier when using a product known as self-leveling concrete resurfacer, or self-leveling floor compound.

Concrete Floor Leveling

In many cases, self-leveling toppings serve a purely utilitarian purpose, such as correcting uneven or damaged floors or serving as an underlayment for tile, carpet, or other floor coverings. But you can also use self-leveling overlays for decorative purposes, by adding integral color to the self-leveling system or by enhancing the overlay using stains and dyes. The overlay can be left seamless (except at control joints) or used as a canvas for sawcut or engraved designs. Or you can incorporate decorative inlays, such as strips of wood or metal, by adhering them to the base concrete and then pouring the overlay to the level of the inlay.

Concrete Floor Leveling

Self-leveling overlay systems for concrete floors offer numerous advantages. They can correct uneven floors, repair damaged concrete, and provide a smooth and durable new surface for decorative treatments. These flowable polymer-modified toppings have the ability to self level without troweling, making them a quick solution for smoothing and leveling worn or uneven concrete.

Concrete Floor Leveling

A general-purpose, concrete-based floor leveling product for concrete and masonry surfaces. Ideal for patios, sidewalks, garages and for preparing surfaces for vinyl sheet good installation. For use with DAP® Concrete Floor Leveler Additive.

Concrete Floor Leveling

If you want to install tiles that glue down, things get a bit trickier. For a successful installation, the concrete floor beneath the tile needs to be more or less perfectly level and smooth. That’s true for compact tiles and even more critical for larger ones, including the popular 1-by-2-foot size. With small tiles, the maximum differential between the lowest and highest point on the floor is 1/4 inch per 10 feet; with larger tiles, the acceptable differential is a mere 1/8 inch per 10 feet. To achieve such flatness, use a self-leveling compound. These come in powdered form and are mixed with water and a fortifying agent. You end up with a thin liquid that when poured from a bucket flows across the existing uneven concrete. Gravity will bring the liquid to a level, but you can help the process along with a broom or trowel.

Concrete Floor Leveling

Concrete floors can develop problems over time. They can settle unevenly, causing a noticeable dip in the surface, they can develop cracks that can trip you when walking across the floor and the surface can be degraded by exposure to excess moisture. This can happen in basements where the clothes washer and water heater are usually located. This damage should be repaired for safety as well as to increase the value of your home. In addition, if you want to lay a new floor of tile or hardwood, you need a level surface to work on. Leveling concrete floors is not a difficult job but it does require some body strength to lift and carry heavy bags of compound. In addition, you may need to rent some special equipment.

When it comes to mixing and applying the self-leveling compound, closely follow the manufacturer’s instructions, because every product differs slightly. Generally speaking, though, no matter what compound you choose, you’ll need to take similar steps to prepare the basement beforehand. For one thing, it’s important to remove any flaking paint or loose adhesive from the floor to ensure that the compound can get a good grip on the concrete. Also, so you don’t need an excessive quantity of compound, it’s not a bad idea to grind down any spots on the floor that are especially high. And of course, if there’s a drain—and you mentioned that there is one—it must be capped and sealed around the seams of its cap. Word to the wise: Wear cleats in case you need to walk across the compound while it’s still wet.

Once the self-leveling compound has set, you can proceed to install your chosen flooring. Alternatively, if you’ve had enough DIY for now, remember that you can eschew a finished floor, opting instead to stain, paint, or polish the compound that now forms the top layer of your concrete basement floor slab.

Mix the self-leveling concrete resurfacer with water in a large bucket according to the instructions on your package. Always add the dry mix to the water, not the other way around, to ensure that the mix is the proper consistency (you can’t remove the water if you’ve added too much). Use a mixing paddle or hook attached to a power drill, and mix the resurfacer at 250 to 500 rpm for about four minutes, or as directed.

responsive