I posted here (Question on relative warp resistance of engineered wood ) to this forum and got help for a wood sheet based project.
My plywood sheet arrived about 5 days ago it is softwood and has a sort of veneer on either side.
There is an issue. There is a 2mm high (approx) raised area at one end, highest at the edge of the wood which comes down approx 30cm and is roughly 30cm in diameter if it was a circle. (I know it sounds pedantic, but the wood is for a person with a severe spinal condition )
My guess is that the hump/raised area came about as a result of a clamp holding the wood in position, perhaps during storage and transport or cutting itself. The raised area/hump is at the rough centre of the edge.
I have not examined underneath the bed yet to see if the raised area has the mirror image shape missing as is upthrust from the top yet, but that would be tricky to do.
My experiences with mdf have not been enormous but it seemed to be flat, for sure and to not have raised areas like described.
My question: - Are such variances (ie 2mm humps not uncommon) part and parcel of using plywood? - If they are common am I right in guessing that mdf is less likely to have a non-uniform surface?
Many thanks in advance gav