If the perimeter, as a whole, slopes to the side or middle, the repair project will usually be a major one requiring the assistance of a contractor. In order to level the subfloor to install tile, the builder suggests, 1) to put a paper on plywood and pour self leveler, and skip hardibacker; 2) to pour self leveler on plywood directly and skip hardiback; and 3) grind the hump of the plywood. After vacuuming or sweeping the subfloor to clean it, add a plywood layer if the subfloor is in very bad shape, but do not overlap the sheets. To check for small high or low spots that may not even be visible, place a long  level or straight pipe on the subfloor. ... With a saw or oscillating tool, cut door casings and jambs to 1/16" above the level of where the finished floor will be. COVID-19 Update to Customers Customers can shop with us … You can then spread it out on the floor in the affected areas. For concrete subflooring, grind down the high spots. Some surfaces and leveling products call for primer; others do not. A plywood subfloor acts as a bridge for minor waves in the existing floor, as well as a leveling compound. – floor tile installer most likely did not level the floor by grinding 1/8 in high areas and filling 1/8″ in low areas. Subfloor plywood is extremely strong and can support most floor types including plywood and treated plywood. Bring in the subfloor panels to the space at least two days prior to the installation so they climatize to the relative humidity of the room (Image 1). The best way to check a floor for general sloping is with a laser level. ", Step 4: Leveling floors can be a DIY project or left to professionals. If your subfloor is made of concrete, use a concrete grinder for wide, open spaces and be sure to wear a respirator as this process can create a lot of dust. Find out how to level a subfloor in this step by step guide from Bunnings. Move it around to different areas and mark any high or low spots you find with a pencil or marker. This will give you an idea of how much work you’ve got cut out for you, and where it’s needed most. Need Help? If you place one end of the level or straightedge on the benchmark high spot and slowly rotate the level around the floor, you'll discover both low and high spots. dryfit sub floor panels to see how they lay out. Then you can draw a line around the room where you want the new subfloor height to be. Particle board is NOT a structural subfloor material and is only manufactured to be used as a inexpensive underlayment filler sheet on top of the main structural subfloor material to raise the height of carpet to a desired level. A general slope means that one end of the room's perimeter is lower than the other end. If the floor is level along its perimeter but there are interior dips or waves that span about 4 inches or less, then putting down a thick plywood underlayment should span and effectively bridge the depressions. Pour a generous amount of mixed leveler onto the subfloor, focusing on one or more wavy areas. But running perpendicular to the joists I have high spots every six to seven feet creating a sway of 2 to 3 eighths at its lowest point. How To Level A Subfloor. This prevents ending up with a small sliver at the end. 3) 30lb felt is 1/16" thick. This is a layer of wood lumber sandwiched between the exterior walls and the foundation walls. A good general rule of thumb is that the foundation shouldn’t slope more than 3⁄16 inch (0.48 cm) every 10 feet (3 m). It will find the lowest areas of the floor and work to level out the subfloor. Be safe when leveling floors and remember that old flooring may contain asbestos. 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