Fill Plywood Subfloor Gaps An effective strategy for filling large gaps is to mix patching compound to a stiff, mortar-like consistency, trowel it into the plywood subfloor gaps and wait for it to stiffen before troweling it smooth. Some sanding may be needed when it sets completely.Click to see full answer. Besides, how do you fill gaps in plywood? Fill voids easily before adhering sheets of plywood together. Sand the surface of the plywood with 80-grit sandpaper. Combine wood filler with some of the sawdust in a small container. Fill a syringe with the wood filler. Lift the edge of the one sheet of plywood until you can insert the syringe over the void. One may also ask, how do you seal a subfloor? Paint the stained subfloor areas with KILZ Complete or Zinsser B-I-N, mildew-resistant, oil-based primers and sealants that block odors and stains. Allow the paint to completely dry. Repeat the application after one hour. Also question is, how do you fill gaps in wood floors? Filling Floorboard Gaps With Wood Putty Clean the floorboards on both sides of the gap. Apply a fine bead of wood putty to the gap, then work it into the gap with your finger, using circular motions to force the putty down into the gap. Remove excess putty from the wood surface using a putty knife. Does plywood subfloor expand?APA recommends a 1/8-inch space between panel edge and end joints. Plywood and oriented strand board (OSB), like all wood products, will expand or shrink slightly with changes in moisture content. If the wood structural panels are tightly butted, there is no room for expansion and buckling can occur.
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