Housewraps are designed to protect a building from air and moisture penetration. By sealing cracks and gaps in the structure, they keep outside air from penetrating the building envelope, reducing air infiltration and protecting the R-value of the insulation inside the walls. Some housewraps also help protect a building from moisture, reducing mold and mildew and improving the structure's durability.

When properly installed, a housewrap forms a protective layer under a building's siding and over the sheathing. It is literally wrapped around a structure, over the wood or foam sheathing, cut out around windows and doors, and taped at the seams to form a protective barrier.

While perforated housewraps and building felt provide an air barrier only, other wraps, such as spun-bonded wraps, provide a breathable, weather resistant barrier that resists air and moisture infiltration, allows walls to breathe and resists bulk water.

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