Housewrap and insulation work together to protect a home’s exterior wall system by controlling water, air, vapor, and heat movement. Housewrap (a weather‑resistant barrier) is installed over the wall sheathing and behind the siding, where it blocks liquid water from penetrating the wall while still allowing water vapor to escape so moisture doesn’t get trapped and cause rot or mold. It also reduces air leakage, cutting drafts and helping the insulation inside the wall perform more consistently. Insulation, on the other hand, provides the thermal resistance that slows heat transfer. Standard cavity insulation (fiberglass or mineral wool) sits between studs, while exterior continuous insulation can be added over the sheathing to eliminate thermal bridging, where heat escapes through the wood framing. Together, housewrap manages moisture and air movement, and insulation manages temperature—creating a durable, energy‑efficient wall assembly.
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