Originally Posted by
Mark Daily
Hmm- I’ve never paid much attention to foam board so it would be important to ensure the thickness is consistent. Aside from that why not lay a sheet of 1/2” MDF or plywood down, cover with contact cement or whatever will bond foam to wood, add the foam board, cement and another sheet of plywood on top. Contact cement would bond instantly so no clamping needed.
Of course you would use strips of wood on all four sides and glue them in place along with anything else.
David, I understand what your saying about bonding to the foam board but wouldn’t it help the entire “sandwich” in resisting twisting, warping, bowing, etc. the same way sticks of wood do in a traditional torsion box?
I just reread your post and if I understand correctly, gluing the wood to foam board won’t be very strong if some force is applied to it like twisting, etc.. In that case gluing to wood sticks on the interior would be stronger, right?
If this works it would eliminate cutting all the wood that goes inside and would still be lightweight. Or am I missing something here?