I considering a similiar insulation to my garage / loft, and need some input/opinions/suggestions to get the maximum wall R-value.
I'm planning on building a 2 car garage with a 1 bedroom apartment (600sqft) loft above in the roof space as the detail below shows.
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The garage will be constructed out of 8" concrete blocks, with partial brick veneer to the lower garage section (below joists) and a batten and board detail from joist level upwards.
My dilemma is acheiving the best R-Value on the walls in the loft area using 8" CMU.
All external walls in the loft area will be 8" CMU. (both gable ends, rear & front pony wall.
After much research I figure quadlocks retro fit could be what I'm looking for depending on the cost.
I'm considering a wall system like this detail listed below-
1/2" drywall, 6mm poly vapour barrier, 1"furring (with 1" styrofoam cladmate inserted) R-5 value, 8" reinforced CMU, Moisture barrier(building paper), quadlock retro fit with R-18 Value then board an Batten.
I figure this would give me an estimated R-Value of around R-24 - R-26
I plan on spray foaming the cathedral ceiling (unvented) & floor to achieve an R value of 38+
I live in southern ontario. I dont plan on heating or insulating the lower garage level, though might consider installing a 1" styrofoamcladmate into the cavity to hold some heat (opinions please)
I plan on fitting the joists on hangers at the bond beam level so no floor joist can come into contact with external moisture. Spray foam at floor and joists should take care of any vapour barrier issues.
I plan on fitting the Quadlock insulation 4" below the underside of the joist level (externally) and foam spraying between all joists
I'm a mason by trade (UK) and have never been a fan of stick buiding, I love the structural element of masonry, plus I save on ALL the labour costs,,
Any input, opinions, advice would be greatly appreciated.
Simon
