Early in this clinic I noted that foam core takes paint well but will
warp. On a small structure like this the painted roof is so small it is
held in shape by being glued to the wall sections. If this were a very large
structure, then support on the underside of the roof would be needed to prevent
warping from paint.
I suggest ribbing like strips of foam core on edge
hot glued to the underside of the roof.
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