The 3 layer construction will help with the cupping, but the real concern is checking and splitting, in the event of a spike in temp or drop in RH. It is time consuming, but it may be worthwhile to coat the ends of the face layer with a sealer, to retard moisture flow out of the end grain. It will help to minimize splitting.
I would like to follow up on Avi's question. Does gypcrete have the holding power to keep the flooring in place?
I would like to follow up on Avi's question. Does gypcrete have the holding power to keep the flooring in place?