House Wrap vs. No Wrap: Does It Matter?
Bentonville Pro Siding & Wrap has installed house wrap on new construction and re-side projects in the Bentonville, AR area for over 20 years, and occasionally a homeowner asks whether it's really necessary, or just an added cost that gets rolled into the estimate. It's a fair question, and the honest answer requires looking at both what house wrap does and what happens without it.
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The Case for Skipping House Wrap
The argument for skipping house wrap generally comes down to cost and simplicity. Adding house wrap to a new build typically adds somewhere around $1,000 to the total cost of construction. Some builders have historically argued that house wrap is a relatively new product, that a home can breathe better without it, and that older methods like tar paper or no barrier at all worked fine for decades of home construction. There's also a version of this argument that shows up when re-siding over existing material: if the old siding is sound and a wrap layer already exists underneath, some contractors skip replacing it to lower their bid.
The Case for House Wrap
House wrap serves as a water-resistive barrier, blocking liquid water from reaching the sheathing while still allowing water vapor from inside the wall to escape outward. No siding material, including vinyl, is actually waterproof. Vinyl siding is specifically designed to shed most water while allowing some penetration, which means house wrap functions as the home's real weather barrier, not the siding itself. Without it, wind-driven rain has a direct path to the sheathing, where it leads to rot, mold, and structural damage over time.
The consequences of skipping it aren't theoretical. Skipping house wrap can void most siding manufacturer warranties outright, since installation specifications from virtually every major siding manufacturer require a proper WRB behind the cladding. Moisture problems that develop from a missing or failed barrier commonly run into the thousands of dollars in repair costs once rot has reached the framing, and by the time interior symptoms like peeling paint or mold show up, the damage has typically been developing for years already. Homeowners who've had to deal with this after the fact often describe it as the single most expensive corner ever cut during construction, precisely because the problem stays invisible until it's already extensive.
What the Code Actually Requires
This isn't just a best-practice recommendation. The International Residential Code has required a water-resistive barrier behind exterior cladding since 2006, and the International Building Code contains a nearly identical requirement for commercial construction. Homes built before that code change may legitimately lack a WRB without it being a construction defect at the time, but current code treats house wrap, or an equivalent barrier, as a baseline requirement rather than an optional upgrade. Acceptable materials range from traditional asphalt felt to modern synthetic wraps, but whatever the material, code requires it to be continuous, properly lapped, and integrated with flashing at every window, door, and penetration.
Where the Debate Has
Some Legitimate Nuance
The one area where reasonable disagreement exists is re-siding over sound existing material with intact wrap underneath. In that specific scenario, replacing the wrap isn't always strictly necessary, provided the existing barrier is undamaged and continuous. But that's a narrow exception, not a case against house wrap generally, and even in that scenario, most reputable contractors recommend a full tear-off specifically so the sheathing and existing wrap can be inspected before new siding goes over it.
The Verdict
This isn't a close call. House wrap is required by current building code, skipping it voids most manufacturer warranties, and the cost of missing it, when moisture problems eventually surface, dramatically exceeds the roughly $1,000 it adds to a typical project. The argument for skipping it doesn't hold up against the data on what happens when it's missing. Whatever version of "we've always done it this way" a builder offers, it's worth remembering that the code itself has evolved specifically because of the moisture problems that showed up in homes built without a proper barrier.
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Let's Get the Wrap Right
Bentonville Pro Siding & Wrap installs house wrap to current code specifications on every new construction and re-side project throughout Bentonville, AR and the surrounding area. Contact us for a free estimate on your next project.