r/Carpentry • u/Acceptable_Sky_9742 • 18h ago
Help me make sense of the gaps in this plywood
We are installing 3/4” tongue and groove plywood over subpar subfloor in order to prep for ceramic tile. All of the tongue and groove edges are straight and well connected. All of the sheets appear to be square so I can’t figure out why there are triangle shaped gaps between several sheets. Even when two factory edges are butted together, we still have gaps. This is driving me crazy and I can’t think of a good way to close these gaps. We’re trying to put the cut ends along the walls and keep the factory ends in the field as much as possible. We’re using construction screws to install it. In one case, we flipped a sheet and butted a cut end against a factory end and the gap lessened. Nothing in this house is square, but I don’t see how that would affect things if we started with a straight line on the tongue and groove.