Closed cell Foam on Bed
Anyone use this 4x8 sheets of this product to raise their pop up pu camper in their bed to raise camper to clear the cab? I have wood 2x6 doubled now but that is so heavy each time to install and remo...
Forum Discussion
I originally had two sheets (one 1.5" and the other 2") of the Formular 250 extruded foam (pink, rated 25 psi compression).
I later glued the sheets together using a Water soluble, non-flammable, contact cement from DAP, as sliding was occurring between the sheets when it was very wet, not at the bed nor the bottom of the camper.
This arrangement lasted two years under my 4,200 lbs camper. The sheet under the camper had indentations of less than 1/8" under the three 1"x4"s on the TC bottom. The front edge was compressed more from the camper bouncing on the very edge of the foam.
I elected to have a wood frame in the truck that supported the entire camper bottom, not just the 4'x 8'feet in the bed, while still having the foam in-between for the added insulation.
Had I not been worried about sagging of the 10'8" camper, I would have used the foam again, with just one change. I would have bought more foam and cut the pieces so they went across the bed and around the wheel wells and filled the bed vs. oriented lengthwise and only just under the TC. Doing it this way, the camper bottom is never contacting just the foam edge and is more supported as it bounces around. This arrangement is also more compatible with your 5th wheel rails.
If you still have compression issues, there are version of the extruded foam that have higher compression ratings that you could laminate.
I later glued the sheets together using a Water soluble, non-flammable, contact cement from DAP, as sliding was occurring between the sheets when it was very wet, not at the bed nor the bottom of the camper.
This arrangement lasted two years under my 4,200 lbs camper. The sheet under the camper had indentations of less than 1/8" under the three 1"x4"s on the TC bottom. The front edge was compressed more from the camper bouncing on the very edge of the foam.
I elected to have a wood frame in the truck that supported the entire camper bottom, not just the 4'x 8'feet in the bed, while still having the foam in-between for the added insulation.
Had I not been worried about sagging of the 10'8" camper, I would have used the foam again, with just one change. I would have bought more foam and cut the pieces so they went across the bed and around the wheel wells and filled the bed vs. oriented lengthwise and only just under the TC. Doing it this way, the camper bottom is never contacting just the foam edge and is more supported as it bounces around. This arrangement is also more compatible with your 5th wheel rails.
If you still have compression issues, there are version of the extruded foam that have higher compression ratings that you could laminate.
