Post construction insulation install?

[CliffinGA]

Robbie my small tear has no insulation just 1/2" plywood and we have used it in low teens and never had and issue even with moisture we just take a few pieces of 1x2"s (that I stole the idea from either Len or Bobhenry) and prop the mattress up after every trip so it dry's out. You can also use the PL glue made for foam insulation board, a/c webbing strips and staples to install on the bottom. Someone on the board has done this and had it go for thousands of miles and years and no issue with it falling down. Glue the foam and cut the straps to cross between your flooring spars and staple or brad nail or screw to the spars not the floor itself.

Cliff

[Robbie]

Thanks everyone for your input! I've got a lot to think about now....

[Robbie]

Well I've found the conduit I am going to use to run my AC power line to the rear of my trailer and realized this will break up the continuity of the foam panel underneath, so I thought about using the spray expand-a-foam stuff to get in the area where the conduit will be so there are no open gaps. Then I got to thinkin, why not just use that spray foam stuff all over the bottom of the trailer? I figure its probably pretty weather proof, will never be seen if it gets hit with rocks or debris, and it will be easily repairable.

Any thoughts about just giving the entire underneath voids a good layer of the spray foam as opposed to trying to glue the blue foam panel up in there?

[jstrubberg]

Getting the right amount in there might be tricky.

I think we forget that wind drag happens on the bottom of the trailer as well as the top. I want mine as slick as is practical.

On the other hand it's tough stuff and not subject to weather at all.

[Robbie]

I'm not too worried about wind drag. If I ever do get concerned about it maybe I'll make a air diverter out of aluminum sheet or something. I was thinking of just spraying it in there in rows so it pretty much fills the entire 1.5" deep void.

[48Rob]

It could work, but...it might cost a small fortune for that many cans.

You might contact a local spray foam installer, it is possible they could easily spray your trailer with material they have "left over" from a bigger job, for not much money?

A local (to me) installer charges about a dollar a square foot per inch of thickness.


Rob