91' Hallmark Bed Sag Fix

flysar wrote:

JoeChiOhki wrote:
Tear it all out and start from scratch using a frame that uses a 2x3 every 12" on center from front to back, then add stiffeners glued and clamped between.

Using weights, glue and screw luwann to new floor assembly.

Lift new floor into place, set a good bead of glue along the perimeter, screw into place. Fill all gaps with tight fit foam board, lay down glue on frame members, install 3/4" plywood floor.

Should hold up solidly to future weight.

If still concerned, have metal shop fab tubular steel frame to replace wood.

I imagine it is possible to overbuild the cabover creating to much weight therefore causing other frame/structure issues down the road.

I don't think Hallmark built it this way to be cheap, maybe the previous owner stored heavy items in the center of the bed?

Thanks for the input.

No, it's a Hallmark, much like Palomino, their old stuff was built about as flimsy as it comes. There's not enough lateral integrity in that floor to support a large load (more than a hundred pounds) without sagging in the current structure. A cabover floor needs to be built at least as strong as the floor that you walk on and that right there is about as half-@ssed as they come.

Given that the cabover on a pop up has no full size sidewalls to give it much larger truss to bear the load, the short side walls are usually built to be able to withstand the load of is occupants by it's own.

If you're concerned about the weight, use 1/2" plywood instead of 3/4". Remember your floor just hangs from the side walls and it's those two little 2x3s that are all that's supporting you and your wife.