Double stud wall
Getting ready to build my own home. Looking at a wall assembly of 2″ exterior EPS, plywood, 2×6 exterior wall with r22 fibreglass batts, 6 mil poly vapour barrier, 2×4 interior with r14 fiber glass batts and 1/2″ drywall. I maintain r30 to the exterior side of the vapour barrier and r14 on the interior side so the 2/3 – 1/3 rule is maintained. I will not have to be concerned with electrical box and plumbing penetrations through the vapour except for items venting or take air from exterior.
Would do it the regular double stud wall but I don’t like penetrating VB and blown in cellulose is expensive here and I can,t do it my self. Northern canada. Where should I install the water barrier on the exterior over the plywood or over the foam before strapping for siding. Will be using 2 stage variable fan speed furnance as well as erv and ground source heat pump to ensure air quality and energy efficiency. R60 in roof. Anyone see an issue with this assembly?
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