How to Attach a Building Wrap?

Attaching building wrap effectively involves a series of steps focused on creating a weather-resistant barrier around a structure.

Attaching building wrap, also known as house wrap, is a crucial step in constructing or renovating a building to protect the structure from moisture and air infiltration. Following proper installation techniques ensures the wrap functions correctly as a weather-resistant barrier.

Here is a breakdown of the key steps involved in attaching building wrap:

Step 1: Prepare and Start Installation

Begin the installation process correctly to establish a solid base.

• Horizontal Rolls: Building wrap is typically installed horizontally around the building.
• Sill Plate: Start at the bottom of the wall, ensuring the wrap extends down over the sill plate.
• Overlap: Allow for a 1-inch overlap on the sill plate itself.
• Corner Overlap: At building corners, ensure a 12-inch overlap to create a robust seal.

Proper overlap at corners and the base is essential to prevent water from getting behind the wrap.

Step 2: Secure the Building Wrap

Once the wrap is in place, it needs to be securely fastened to the sheathing.

• Fasteners: Use fasteners specifically designed for building wrap. The reference specifies using plastic-capped nails. These fasteners help prevent tears in the wrap and distribute the fastening pressure evenly.
• Pattern: Fasten the wrap according to the manufacturer's recommendations, often following lines printed on the wrap itself. This ensures adequate attachment while allowing the wrap to breathe.

Step 3: Layering and Sealing

Subsequent layers of building wrap must be installed correctly, working your way up the wall.

• Overlap Layers: Each subsequent layer of wrap should overlap the bottom layer by 6 inches.
• Shingling: Ensure proper shingling. This means that upper layers overlap lower layers, allowing water to shed down the wall surface and over the wrap, rather than getting trapped behind it.
• Seal Seams: Cover all seams using tape specifically designed for building wrap. Taping reinforces the overlaps and prevents air and moisture from penetrating the seams. Tape should also be used around windows, doors, and other penetrations.

Step 4: Final Inspection

Before proceeding with exterior cladding, inspect the installed building wrap.

• Check for Damage: Carefully inspect for rips and tears in the wrap. Any damage compromises the wrap's ability to act as a weather barrier.
• Repair: Patch any rips or tears using building wrap tape.
• Verify Overlaps and Fastening: Ensure all overlaps are correct, all seams are taped, and the wrap is securely fastened everywhere, especially around openings.

Following these steps helps ensure the building wrap provides effective protection for the structure.

Summary of Key Overlaps:

Proper installation is key to maximizing the benefits of building wrap as a critical component of the wall assembly.