What is a correct way of fastening two layers of 2″ rigid insulation to the exterior of a 2×6 wall?
I would like to know the correct way to fasten two layers of rigid foam insulation where the total thickness is 4″. I am concerned that when hanging this thickness of foam it will be difficult to be sure that the siding application is secure. We will be using HardiePlank horizontal lap siding. This is a form of cement board and heavy on it’s own. Any advice.
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