What are Weather Barriers?

Weather barriers (also called weather-resistant barriers or WRBs) are materials or systems installed in a building envelope to protect the structure from water, air, and sometimes vapor infiltration while still allowing moisture vapor to escape. They help prevent mold, rot, and energy loss.

APEX provides expert installation of weather barrier systems designed to protect buildings from air and moisture intrusion while promoting long-term durability and energy efficiency. Our team specializes in fluid-applied, self-adhered, and sheet-applied barriers across a range of substrates and cladding types.

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Our Weather Barrier Services Include:
1. Fluid-Applied Air & Water Barriers
Spray- or roller-applied membranes that create seamless, durable protection for complex wall geometries.

2. Self-Adhered Membranes
Peel-and-stick sheets applied to sheathing for air and water resistance, commonly used around windows, joints, and penetrations.

3. Drainable Wraps & Sheet-Applied Barriers
Mechanically fastened systems with integrated drainage for siding, stucco, or masonry veneer assemblies.

4. Flashing & Transition Detailing
Integration of window flashings, sealants, and specialty tapes to ensure a continuous, code-compliant air and moisture barrier.

5. WRB for Stucco, EIFS & Masonry Systems
Proper layering of building paper, mesh, and barriers per cladding-specific manufacturer specs and ASTM standards.​

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Why They Matter:

• Without a proper weather barrier:

• Moisture can enter wall cavities and cause rot, mold, or structural damage.

• Air leaks can increase heating/cooling costs.

• The building envelope fails prematurely.

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Why APEX for Weather Barrier Installation?

• Factory-trained crews familiar with top WRB manufacturers

• Precision installation that meets energy codes and water penetration standards

• Seamless coordination with cladding, framing, and insulation trades

• On-site quality control to ensure proper adhesion, thickness, and detailing