House Wrap Needed?

Hi Tom
I am building a new home and plan on using 2 x 8 studs for the walls, 1/2"
exterior sheathing then a layer of foil faced (both sides) thermax insulation and tape the seams, then siding. I am going to have the
walls spray foamed with 4" of insulation and then standard 1/2" sheet rock
interior walls. question is with how tight the walls will be with the spray
foam and the thermax insulation on the exterior will I still need to use
Typar house wrap before I install the siding.
Craig

Hi,
The house wrap is no necessary to protect the foam.
I might consider installing the foam before the sheathing, then installing
the sheathing over it with slightly longer fasteners. Then you have a full
nailing surface for siding.
In that case, you would use house wrap or tar paper to protect the
sheathing.
Tom