I am remodeling a tiny house that was not built up to standards. I have a question about the floor assembly. The floor deck was framed with 2x4s with eps foam between the joists and aluminum 4×8 sheets glued to the bottom of the joists. No can foam was used between the foam joints and framing. There is 3/4″ subfloor nailed and glued to the top of  joists. Can condensation occur on aluminum sheets beneath the joists? I do not want to remove subfloor and air seal the eps foam with can foam, and would rather apply spray foam to…

Hi Folks,  I have a very goofy situation I’m trying to resolve.  Someday maybe I can build new and build right, but for now I have to solve problems inherited from others.  Here’s a long explanation of the situation, but the short question is how much should I worry about condensation in a wall that can’t dry very easily, and should I scrimp on insulation in it because of that concern? I have an exterior wall of about 40 square feet in a first floor bathroom, behind a fiberglass tub and shower area.  There is a one foot drop or…

I’m building an all ICF home in Climate Zone 5.  We’re planning to use the manufacturer recommended peel and stick waterproofing membrane before grade.  For the above grade walls, we’re also planning to install a weather resistive barrier to prevent bulk water intrusion – I’m aware of the debate about whether or not this is necessary and have decided that since there’s any debate about it, I’m just going to install one for peace of mind.  The ICF  block manufacturer doesn’t require an above grade wrb, however, they say that if you want to use one or if it’s required…