I will be fabricating a new bottom board for a customer's vertical piano (moisture/mold damage). Any opinions on the best material for the job? I suppose some sort of plywood. I am using a hardwood veneered gazillion-ply plywood for another project and am surprised at how soft it is - I don't think that will be the best thing. My concern is for screw holding. I don't know my plywood grades all that well. I should think an exterior grade of ply made of yellow pine or something similar with one side sanded (the inside side) would do the job well. Is there a grade designation that specifies good hard wood that will hold a screw well? Or should I just make it out of a couple pieces of edge-glued (some sort of water-proof glue) hard maple? I have tons of that in my shop - I would have to make a trip to the lumber yard for plywood. Comments? Suggestions? Thanks! Terry Farrell
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