Potential for costly callbacks, and damage to reputation.
When housewrap was first used in the late 1960’s, it was an important first step in the control of air and moisture flow through exterior walls, making it a welcome addition to residential construction.
As there was limited control of air and moisture flow before housewrap, the performance it delivered was viewed favorably. However, building science has evolved and the demand for more energy-efficient homes has grown, and the inherent weaknesses of housewrap have become more apparent.
The problems with housewrap are that it allows air and moisture to penetrate the building envelope, and it’s not waterproof.* Holes caused by staples and nails, untaped seams and tears compromise its ability to be an effective air and moisture barrier. The integrity of the building envelope cannot be compromised with an ineffective product if you plan to design and build truly energy-efficient homes with adequate moisture protection.
*Problems with Housewraps-Research Report - 0106 - Joseph Lstiburek 2001