Hello everyone and thanks for all your replies. First. I did mix up the type of plywood I used. It was birch plywood. I used oak panel in the room, and I mixed up the wood types. I did allow the wood and the homasote to get use to the room temp before I glued and screwed all together. I think the area of homasote that bellied was caused by the radiant heat I installed under the floor plus the heat radiating from the radiant heat I put in the concrete floor in the shop below. I have yet to insulate between the floor joist and keep the heat in the shop. The problem area is contained to 2 4x8 plywood sheets. I got under the layout and used a toe jack to push up the plywood in the middle of a 4x4 section. it pushed up the plywood to the bottom of my beam level, but there were still dips on both sides of the push up. I ordered 4 basement beam jacks the I will place in the 4 4x4 areas that have bellied with large surface plates above and below the jack so that the lift up covers a large area. Since I cannot tear out the affected areas, I have to work with what I have. I'll let all know how this fix works out.
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