To install a self-leveling cement over plywood subfloors. If you’re a beginner, don’t worry. You’ll learn everything you need to know to successfully complete this job. You can also use our handy self-leveling subfloor calculator. It makes installing self-leveling compound over plywood easy and affordable.
Preparation of self-leveling cement
Prepare the subfloor for self-leveling cement by preparing it for the floor covering by mixing the material thoroughly. Self-leveling cement is mixed using a 1/2″ electric drill and a mixing paddle, similar to those used for drywall and thinset. Mix the leveling compound in batches of five minutes or so, leaving room between the batches for each one to dry. After the first batch has completely dried, the second should be poured in and meet up with the edge of the first one.
It is important to select a structurally sound and stable substrate for self-leveling underlayment.
Knowing the substrate’s porosity is critical in choosing the appropriate primer. A water-droplet test or ASTM F3191 are recommended methods for determining the surface porosity. Sound concrete will only require one coat of primer, while unsealed Gypcrete may require several coats of primer.
Method of application
A polymer-based concrete, self-leveling cement is an excellent choice for a variety of surfaces, including plywood subfloors. To install self-leveling concrete over plywood, you’ll first need to remove any loose debris and apply a floor primer. Then, pour the self-leveling concrete over the plywood and level it with a leveling leveler or paddle.
After the plywood subfloor is leveled, use a straight edge to mark the self-leveling peg. It’s best to measure two points: one at 1/4 inch off the floor and the other at half an inch below the hardwood. If the plywood subfloor is not flat, make sure to make the peg and the self-leveling underlayment meet at these two points. If not, cut the peg to the desired depth and place it on the floor.
If you’re applying the self-leveling cement over a single room, you can use the self-leveling compound to a specific height. The new subfloor must be higher than any high or low spots. You can use a revolving laser level to measure the height of the new subfloor and draw a line around it. Afterward, it will be set in a couple of hours.
Set heights of self-leveling cement
Unless the wood subfloor is already level, self-leveling cement cannot bond to it. Whether you use a concrete or wood subfloor, self-leveling cement has a specific mixing ratio. The height of the self-leveling peg should be about 1/4 inch above the floor and 1/2 inch below the hardwood. The set heights must be checked using a straight edge across two points.
For even floor leveling, you should always apply a primer layer before applying self-leveling cement. To achieve better results, you can mix the cement with water up to the maximum. The powder is available in white or gray color. After mixing it with water, you should apply it over the primer layer. For greater leveling, add water up to two-thirds of the mixture.
If the wood subfloor is level, self-leveling cement overlays are an excellent choice. The process of applying the concrete overlay creates a level, smooth, durable, and aesthetically pleasing surface. Old houses and buildings are perfect candidates for this method. The advantages of this method are substantial, including the ability to choose the color. The finished product is much more durable than ordinary concrete. It won’t crack or warp as easily.
Installation of self-leveling compound on plywood subfloors
Self-leveling compounds are concrete mixtures made from polymer compounds that can level a variety of surfaces. In order to apply self-leveling compound to plywood subfloors, you must first remove all debris from the room. Then, apply floor primer to the plywood and stir the mixture with a hand trowel or an electric mixer. Pour the mix onto the plywood, ensuring that it is evenly spread.
Mix the self-leveling compound in a bucket, preferably a six-gallon one. You should mix the mixture in the bucket carefully and keep it away from heat vents. Once you have mixed the mixture, spread it along the subfloor and keep it as low as possible to avoid spillage and splashes. Never allow the self-leveling compound to set too hard, otherwise it will never level. You should also pour only enough to cover the floor, preferably a small area. Once it has set, use a spirit level to determine the depth of the dips or holes.
