3M 3015TWF vs. Tremco ExoAir 110AT: A Head-to-Head Comparison of Air & Vapor Barrier Flashing Tapes

Battle of the Barriers: ExoAir® 110AT vs. 3M™ 3015TWF vs. 3M™ 3015NP

When it comes to protecting buildings from air and moisture infiltration, choosing the right barrier system is critical. Today, we’re comparing three top-tier self-adhered air and vapour barriers: Tremco’s ExoAir® 110AT, 3M™ 3015TWF, and 3M™ 3015NP. Each offers unique strengths, but which one is right for your project?

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1. ExoAir® 110AT (Tremco)

Overview:
A high-performance, 18-mil butyl-based membrane with a rugged HDPP facer. Designed for air, vapour, and water resistance in a wide range of substrates.

Pros:

• Primerless application for most surfaces
• Excellent elongation (677%) and tensile strength (2,620 psi)
• High temperature resistance (up to 240°F / 115°C)
• Low air permeance (0.001 L/s·m²) and vapour permeance (0.02 perms)

Cons:

• Not suitable for damp or frost-covered surfaces
• Limited UV exposure (12 months max)

Best For:
Projects requiring high durability, flexibility, and compatibility with a wide range of substrates.

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2. 3M™ 3015TWF (Through Wall Flashing)

Overview:
A 15.5-mil-thick, black polyethylene membrane with high-tack acrylic adhesive. Designed specifically for through-wall flashing and damp-proofing.

Pros:

• No primer needed for most surfaces
• Excellent puncture resistance and elongation (>600%)
• Flexible at low temperatures (-30°C)
• UV resistant for up to 12 months

Cons:

• Limited to flashing applications
• Lower tensile strength compared to ExoAir

Best For:
Detailing and flashing applications where flexibility and adhesion are key.

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3. 3M™ 3015NP (Air & Vapor Barrier)

Overview:
A semi-translucent, acrylic-based membrane designed for full wall air and vapour barrier applications.

Pros:

• High elongation (700%) and tensile strength (2,150 psi)
• Excellent air permeance (<0.0021 L/s·m²) and vapor transmission
• Wide service temperature range (-40°C to 116°C)
• LEED-compliant and low VOC

Cons:

• Requires careful surface prep and may need primer for difficult substrates
• Slightly thicker (0.25 mm) and heavier than others

Best For:
LEED projects and full-wall applications where sustainability and performance are priorities.

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Final Thoughts

Each product excels in different areas. ExoAir 110AT is a robust, all-around performer. 3M 3015TWF is ideal for flashing with excellent flexibility. 3M 3015NP stands out for sustainability and full-wall performance.