My home is in the framing process. Why did they use a shiny backed foam board instead of 1/2 OSB for several areas of the outside walls. Under/above the windows, the oustside of the garage walls and several other areas do not have OSB. They have this foam sheeting material and the whole house is wrapped in Tyvek.
It may have to with with cost. As long as the outside corners of the wall are sheeted with OSB, you can fill in the wall with a somewhat cheaper "filler" material without the wall losing it's strength. The shiny backed foam adds to the insulation value of the wall, so it's sometimes not a bad compromise.
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