posted 4 years ago
Hey y'all,
I purchased a used (but unbuilt on) 8x20' tumbleweed trailer a few months ago and am trying to get over a few hurdles before diving into wall framing. So far I have insulated the cavity of the trailer with 3" rigid foam and installed a layer of 3/4" advantech sheathing for the subfloor, using sill seal to prevent thermal bridging. I was ready to start putting up the walls but have had second thoughts about whether this is a sufficient amount of insulation for the floor--I live in central Maine and hope to be able to live in it year round. Other sources I've seen went with a 2x6 framed subfloor to allow for 5 1/2 inches of flooring insulation.
So, what would be the best way to proceed?
Option 1: Frame an additional subfloor with 2x4s on top of the existing sheathing. I could insulate with 3 1/2" of rigid foam or possibly wool batting which is what I would like to use for the walls and ceiling. Then install a vapor barrier and another layer of sheathing. My concerns about this are that it seems unnecessary to have 2 layers of heavy sheathing and it raises my floor height 4 1/4". Should I pull up the first layer of sheathing and try to reuse it on top?
Option 2: Leave the subfloor as is and start building. If it proves to be cold I could always put straw bales around the exterior of the trailer. Maybe even heat the underside with a compost pile or wood chips?
Option 3: Other better suggestions?!
Thanks so much,
Marc
Palermo, Maine