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Trailer's with fiberglass bat insulation without vapour barrier is useless. If one removes a window, holds back the siding with their fingers and looks down - inside the wall cavity, one would be shocked on how much gaps within the wall cavity really exists. A very thin layer of fibreglass material and huge amount of air gap. And, no vapour barrier - to stop air drafts. Lack of proper insulation near criminal. But since a thin layer of fibreglass material exists, the lawyers are will win during a law suit.
If one wants a properly insulated trailer, simply buy a TT that's a few years sold, remove its interior, apply contractor grade Spray foam @ 3" thick and re-install the walls. Very simply DIY prep work and Spray Foam guy with their mobile truck. And with spray foam, no vapour barrio is required.
IF wondering, I got contractor grade spray foam under my 2006 Jayco TT. The before and after is amazing. Same amazon results shown within:
- Click Here - When / if my TT roof or walls leak, these area are getting Contractor Grade Spray Foam upgrade as well. Very simply DIY task.
If not into DIY upgrades (to ensure inner wall, roof and underbelly areas are insulated properly), then buy a different brand of trailer - that offers factory vacuum bonded insulation. Spray Foam (contractor grade - Close Cell) is that amazing... My trailer is proof of it...
If wondering, here's a Park Model Trailer with Spray Foam upgrade from the outside. re:
- click here - Spray Foam (Contractor grade / Closed Cell) is amazing stuff.