This is quite a shocker to me and my wife. We have been working on our house for a while and finally got to doing some interior finish. Opted out of drywall and went with 3/4" TG wide pine flooring. We found mold growing on the inside of exterior sheating, as we pulled fiberglass insulation to run some CAT5 before installing wood finish. We now checked several areas and mold is in almost every stud bay.
Profile of the wall looks like this (all new materials, foundation up):
- no siding yet
- windows not taped yet
- 1" polyiso foam, foil side to the house, not taped yet (I am debating this as the cause of a problem here)
- 1/2" OSB
- 2x6 studs
- R-19 unfaced batts between studs
- at some areas we had 4mil plastic, to avoid contact with fiberglass (but mold is also in spaces without plastic)
Mold is growing from the sill plate up, about 4ft high. It's also present under insulation between floor trusses (above the space we are talking about) and in the walkout basement wall, where we actually used 1" pink foam (taped at the seams) - which has damaged my theory that it happens because we haven't taped polyiso.
I am literally speechless and devastated... what do I do next?
Pull insulation, spray with borax/peroxide mix?
Tape seams outside, tape windows?