House Wrap
A weather-resistant barrier installed over wall sheathing, beneath siding, to prevent water infiltration while allowing moisture vapor to escape.
Why It Matters for Homeowners
Why it matters: house wrap is invisible once the siding goes up, but it is the single layer keeping water out of the wall cavity. It only works if the seams are taped and the wrap is correctly integrated with the window and door flashing. The right moment to verify house wrap is during demolition, before new siding is installed. After the siding is on, any house-wrap mistake is buried for the next 30 years.
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