High Spots and Bumps in Subfloor If you need to bring down your subfloor, you can try either a hand plane or a power sander. - Duration: 3:47. Place shims on the subfloor. In our case, this occurred in a particularly uneven spot … A measurement is taken from the high spot and again at the perimeter of the room and then those measurements are used against a long stretch of wood or plywood. When a chalk line is snapped between the two, a long, tapered length of wood is outlined. It gives information on the subfloor situation covered in this article, and the steps required to level a subfloor without taking up the existing subflooring material. High Or Low Spot? Repair High Spots in a Wood Subfloor and Clean It If the subfloor is plywood or particle board, start by screwing down any loose boards or plywood sheets. The string does a better job of showing high and low areas across the whole floor. Once it is cut off with a circular saw, place the shims on top of the joists and nail or screw them into place. . In some cases, it is necessary (or at least beneficial) to address an uneven subfloor issue at the joist level. If not, your floor covering, which is the solid hardwood, laminate, tile, or other exposed flooring that goes on top of the subfloor, will never be flat and level.This problem can be fixed, but it all depends on exactly what kind of uneven subfloor … Repeat on the other side of this joist. The floor must first be cleaned of all debris, vacuumed and then mopped and allowed to dry. Step 2: Set a strategy for filling in low spots … The most basic method is to take a piece of tar paper, fold it in half and then push that underneath the flooring material being installed over the subfloor. How to Stop Hardwood Floor From Making Noise, How to Mix Flooring Materials in the Same Room, How to Reinforce Floors With a Crawl Space Foundation, Ask the Builder: Getting a New Hardwood Floor Level, Hardwood Installer: Preparing Wood Sub Floors for Hardwood Floors, How to Level a Subfloor for Laminate Flooring, How to Level a Floor Before Installing Vinyl Floor Tiles. Add Supports. Install to within 6-8 rows of flooring to the high spot and then start installing thin pieces of cedar shingles to create a GRADUAL rise to the high spot and then do the same to create a … . Any time you use paper, roofing shingles, linoleum, or similar products to build up low spots in the subfloor, you reduce the fastener penetration into the wooden subfloor, which in turn increases the potential for squeaks, crackles, pops, or overall disengagement from the subfloor. … The laminate is 8mm thick with a foam underlay … We're repairing an existing floor that will receive floor tile. We cut out the old flooring in an area 6 feet wide down the entire length of the room. It’s going to be a compromise on several fronts if the high … Fixing a low joist is pretty straight forward: jack it up and sister join another joist to the original one. All high spots that don't meet a 1/4-inch-in-10-foot tolerance have to be removed. Determine the Underlying Problem. Unlike a concrete subfloor, you can usually knock down high spots on a wood subfloor by sanding, and you can always fill depressions with patching compound. © Copyright 2020 Hearst Communications, Inc. Lowell Brakey, a Kansas concrete contractor, has developed a slick way of doing this. Flooring installers will look at the whole site and fill the low spots and might raise the whole floor with plani-patch if they have to. Move the material around with a straightedge to ensure it is evenly distributed and then allow gravity to do the rest. 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