Bad allergies and building a new house in Seattle
I’m building a new house in Seattle . The foundations is complete and the framing is underway.
I have bad allergies to mold among other things and was unable to live in a house that I remodeled two years ago (also in Seattle). https://thisdamnoldhouseblog.wordpress.com/ (scroll to the bottom and read up) So this time I am starting from scratch.
My new house has the following envelope/heating features and I’m looking for recommendations/comments on details that will prevent mold and ensure high indoor air quality.
Basement (slab and walls have already been built)
Followed the waterproofing recommendation in Hammer and Hand Guide
Using 1″ EPS foam behind studs (1″ gap between concrete and studs) and Mineral wool batts between studs
Walls (being constructed now)
From outside to in: cement siding, 3/4″ rain screen, 1.5″ exterior rockwool, VaproWrap SA, sheathing, mineral wool batts, gypsum board, latex paint
Ventilated roof with asphalt shingles over roofing felt
(Any recommendation on type of roofing felt?)
Insulation is being added to ceiling (type of insulation is TBD, any recommendation?)
Air and Heating system
Hydronic infloor heat in 4″ basement slab and 1.5″ gypcrete at main/upper
Lifebreath HRV for whole house continuous ventilation
AC for top floor only (Mitsubishi air handler in basement)
Requiring minimum ACH of 3
Airsealing with Aerobarrier (any thoughts on this?)
Framing during wet time
contract requires that the wood moisture content be below 18% before insulation and drywall. I’m also requiring that all wood piles be tarped and that the subfloor be swept and any standing water be removed daily. Unbelievably, the last 2 weeks have been perfectly dry in Seattle which is a rarity for October. If anyone has any tips for keeping mold at bay during the ‘open time’ I would be appreciative.