An optional 1 ½” service cavity can be installed in the shop, or installed on site by others if the depth requirement is greater. This wall requires a more complex installation due to the lesser ease of fastening through bottom and top plates with structural screws, but can provide a less thick overall wall dimension and an R-value more reasonable for more temperate climates. With a smart vapour retarder on the interior, the vapour control strategy can be more suitable to challenging climates. 1 ½” (2×4 on the flat in the shop) or 3 ½” (2×4 on edge, by others on-site) (strapping for services, typically uninsulated, but optional to insulate on site, optional), R-6 or R-14.Pro Clima Intello Plus airtight reinforced smart vapour retarder (primary air and vapour control layer, holds cellulose).2×6, 2×8, or 2×10 framed structural wall on 16” or 24″ centers, with densepack cellulose, R-20, R-27, or R-34.2 3/8″ (60mm) wood fiberboard tongue and groove insulation board (thermal bridge-free continuous insulation layer), R-8.5.Option to increase thickness to 4 3/4″ with no lead time increase, or other sizes with increased lead time. Pro Clima Mento 1000 airtight monolithic WRB (secondary airtightness, weather protection), taped airtight.This wall can also be constructed with the layer of plywood on the interior in place of the smart vapour retarder, with no sheathing between the outboard side of the structural wall and the wood fiber insulation.
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