Improperly Taped or Overlapped Seams

House wrap only performs as designed when every seam is taped and every course overlaps the one below it, directing water downward and out rather than behind the barrier. Crews working quickly, or without proper training on lapping direction, sometimes skip taping seams entirely or overlap them backward, which lets water track behind the wrap during any wind-driven rain. This is one of the most common causes of house wrap failure, and it's also one of the hardest for a homeowner to catch, since the mistake is completely hidden once siding goes up over it.

UV Degradation from Construction Delays

House wrap is designed to be covered by siding relatively quickly after installation, and most products carry a limited UV exposure rating, often 60 to 180 days, before sun exposure starts degrading the material. Construction delays, weather setbacks, or a builder working through multiple trades on a tight schedule can leave house wrap exposed well past that window. Once the material has degraded from UV exposure, it loses its water-resistive properties even though it may look intact from a distance, leaving the wall assembly vulnerable once siding is finally installed over it.

Fastener and Penetration Damage

Every penetration through house wrap, whether from siding fasteners, electrical fixtures, or plumbing vents, needs to be sealed to maintain the barrier's integrity. Fasteners driven at the wrong angle can tear the material rather than simply passing through it, and unsealed penetrations around vents or fixtures create a direct path for water behind the wrap. These small gaps rarely cause immediate problems, but over years of exposure to Madison's roughly 55 inches of annual rainfall, they become a slow, steady source of moisture intrusion.

Age and Material Breakdown

Even correctly installed house wrap has a functional lifespan, and older homes may have house wrap that predates current product standards or has simply broken down after decades behind the siding. Signs of this include brittle, torn material discovered during a re-siding project, or a musty smell and interior staining that shows up gradually over several years rather than after a single storm event. Because the wrap is hidden, this kind of gradual failure often isn't identified until siding is removed for an unrelated repair or replacement project.

How Fixing a Failed House Wrap Works

Correcting a failed house wrap almost always requires removing the siding in the affected area, since there's no way to repair or replace the barrier underneath without access to it. Any damaged sheathing found underneath needs to be addressed before new house wrap goes on, since covering rotted material with a new barrier doesn't solve the underlying problem. From there, new house wrap is installed with correct overlap, taped seams, and properly sequenced flashing at every window and door opening, restoring the wall assembly's ability to manage moisture the way it was designed to. On projects where only a section of the wall is affected, repair can sometimes be limited to that area rather than requiring a full tear-off, though the surrounding wrap should still be inspected to confirm it hasn't also degraded.

Think Your House Wrap Might Be Failing?

If you're noticing musty odors, interior staining, or rising energy bills without an obvious cause, a failed house wrap behind your siding could be the reason. Madison Pro Siding & Wrap inspects and repairs house wrap for homeowners throughout Madison, AL and the surrounding area. Contact us for a free estimate and an honest assessment of what's happening behind your siding.