Horizontal furring over rockwool insulated sheathing: Are vented strips necessary?
I was watching some of Big Joe’s talks on youtube the other day on rainscreens. Specifically discussing allowing a vertical air patch behind the siding for adequate drying. It got me thinking about my siding plan as I’ll need horizontal furring strips.
My wall assembly is as follows:
7/16 osb sheathing
2″ roxul comfortboard 80
1.5′ x 4′ JH Fiber cement panels with 1/2″ reveals
Climate zone 6 (Toronto)
My question is:
Will the roxul sheets behind wood furring strips provide adequate draining/drying capability, or should I splurge on corrugated plastic vented furring strips (cor-a-vent is what we can get here in Toronto) for 5.5 times the cost?