Wall sheating on top of the rainscreen
This is something I’ve been wondering for a while.
Why on a vented roof we put the sheating directly on top of the vent channel but on a wall we put in behind it (rainscreen)? Wouldn’t it be smarter to just nail the sheating on top of the wall furring and then install your cladding on top of it?
You could always put some sort of paper (Tyvek for instance) between the two to slow water absorption like it’s done on a roof. And if your sheating get really wet, it can dry pretty quickly as long as the venting gap behind it is large enough. Plus, your house would have some good shear resistance without messing with your insulation plane. That would solve the double wall cold sheating problem. And you wouldn’t need to worry about where you nail your trims because you got wood everywhere.
Of course, you’ll still need to replace the sheating behind the furrings with some kind of windtight membrane to prevent wind washing through your insulation so there are some added costs. But that’s still a pretty cheap wall compare to using rigid foam or rockwool panels.
I am missing something because it’s seem like a simple and good solution to me?
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