What Each Material Actually Is

House wrap is a spun-bonded synthetic sheet, engineered to block bulk water while still allowing water vapor to pass through, letting any moisture that gets into the wall assembly dry out over time. Building paper, sometimes called felt paper or tar paper, is asphalt-saturated paper that has been used as a weather barrier for well over a century. Both products serve the same basic function behind siding, but their material composition changes how they perform under different conditions.

Vapor Permeability and Drying Potential

House wrap's vapor-permeable design is its biggest advantage in humid climates, since it allows a wall assembly to dry to the outside if moisture does get trapped inside. Building paper is less permeable, which can trap moisture against the sheathing in some wall assemblies, particularly when paired with certain modern insulation and vapor barrier combinations that weren't common when building paper was the industry standard. In Madison's climate, where humidity stays elevated for months at a time, this drying capacity is a meaningful factor in long-term wall performance, since a wall assembly that can't dry out eventually shows the effects in the form of sheathing rot or mold growth behind the siding.

Durability and Tear Resistance

House wrap is generally more tear-resistant than building paper, particularly during installation, when crews are stapling, taping, and working around it for days or weeks before siding goes up. Building paper can tear more easily during handling and is more prone to degrading if exposed to UV and weather for an extended period before being covered. This matters on projects where construction delays leave the barrier exposed longer than planned, since a more durable material holds up better to that added exposure without needing costly repairs or replacement before siding is even installed.

Water Resistance in Heavy Rain

Both materials are designed to shed bulk water, but house wrap's synthetic construction and factory-taped seam systems generally provide more consistent water resistance than building paper's overlapping courses, which rely more heavily on correct installation technique to prevent water tracking behind laps. Given Madison's roughly 55 inches of annual rainfall, a barrier that performs reliably across repeated heavy rain events over decades is worth prioritizing over one that depends more on installation precision to achieve the same result.

Cost and Availability

Building paper is generally less expensive than house wrap on a per-square-foot basis, and it remains an approved option under most building codes, particularly for certain masonry or stucco applications where its specific properties are still preferred. House wrap costs more but has become the standard choice for most residential wood-frame construction, largely because of its combination of vapor permeability, tear resistance, and consistent seam performance across a wide range of siding types. For most homeowners, the modest cost difference is small relative to the overall siding project budget, making the choice less about savings and more about long-term wall performance.

Which Performs Better for Most Homes?

For the majority of residential wood-frame construction in North Alabama's humid subtropical climate, house wrap generally outperforms traditional building paper, primarily due to its vapor permeability and more consistent seam and tear performance. Building paper still has valid applications, particularly in certain masonry or stucco assemblies, but for standard vinyl, fiber cement, or James Hardie siding installations, house wrap is typically the better long-term choice.

Planning a New Build or Re-Siding Project?

Madison Pro Siding & Wrap installs house wrap and weather barrier systems for new construction and full re-siding projects throughout Madison, AL and the surrounding area. Contact us for a free estimate and a recommendation suited to your specific project and budget.