I need to fabricate a small wooden masking platform that will serve to reduce the gaps between radiator pipe holes in the floor and the floor itself. Basically, the gaps are more than what pleases the eye and, now that I know exactly where the pipes are going, I can stencil out a hole projection on a piece of wood that is about 1" x 10" x 10" so that, when it goes on the floor, it closes some of the gap between the pipes and the holes. Basically, I am doing the same thing that an escutcheon would do but I can't use escutcheons because the pipes are too close to one another.
Since this wooden plate will be nailed to the floor and there will be presence of heat nearby, what is the best choice of wood-like material to cut this piece? The clear choices are
SPF lumber (cut a piece out of a 1x12) and smooth
plywood. I would prefer to not use
OSB as it has a rough surface. The most critical aspect is the material's warping resistance, obviously I would like something that will not warp under the presence of heat over time.