Spongy Floor

Bumpyroad wrote:

mobilefleet wrote:
in order to save weight, manufacturers of "lightweight" units do things like use thinner subfloors and spacing out the floor supports further, thus having less supports. Look under trailer and prob will see one support every 4-6 ft. You can simply weld in some angle iron across the width of your trailer to give more support. Adding more weight (ie plywood floor) to a floor that's already weak only makes it worse.

I certainly agree that the weight and cc must be taken into account, but gluing/laminating another layer of plywood be it luan, 1/4", 3/8" etc? to make the floor sturdier is just improving on the original structure.
bumpy

^^This^^

Provided of course that issues is not water damage related. Fix that first, if you can before gluing another layer to it. My trailer has a softish floor, but its due to it being the lightweight trailer more than anything else. It has a sealed underbelly, so water isn't the issue, its just what they used for flooring.

If the substrate is solid, just thin, then uses a wood to wood elastic adhesive, similar to that used to lay commercial floor tile with. Spread it out evenly across a section, then lay in 3/8" subflooring, precut and fitted of course, then screw it in place, with screws every few inches around the perimeter, and every 6" across the middle. Use regular SYP plywood, not OSB, the latter loves moisture and expands like crazy, and is also heavier. Once done, then you can put whatever flooring you want on it.