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  • Commercial
    • Products
      • Air & Vapor Barriers
        • Fluid-Applied, Impermeable AVB
        • Fluid-Applied, Permeable AVB
        • Self-Adhered, Impermeable AVB
        • Self-Adhered, Permeable AVB
        • AVB Flashing
        • AVB Primers & Adhesives
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      • Polyiso Insulation
        • Wall Insulation
      • Roof Coatings
        • Acrylic
        • Aluminum
        • Asphalt
        • Silicone
        • Spray Polyurethane Foam
      • Roof Coatings Accessories
        • Repair Fabric & Reinforcement
        • Mastics, Cements, & Sealants
        • Adhesives & Primers
      • Roof Membranes & Accessories
        • Adhesives, Primers, & Sealants
        • Built-Up Roofing (BUR)
        • SBS-Modified
        • Self-Adhered
        • Underlayments - Steep Slope
      • Single-Ply Roofing
        • Roofing Insulation & Accessories
        • TPO Roofing
        • EPDM Roofing
      • Waterproofing
        • Above-Grade Waterproofing
        • Below-Grade, Post-Applied
        • Below-Grade, Pre-Applied
        • Damp Proofing
        • Traffic Coatings
        • Waterproofing Accessories
      • Waterstops
        • Hydrophobic
        • Injectable
    • Systems
      • Roof Restoration Systems
      • Integrated Building Envelope Systems
    • Product Search
    MiraPLY Received Early Thumbs-Up on Nvidia Project

    Blog

    MiraPLY Received Early Thumbs-Up on Nvidia Project

    Read More
    Maximizing School District Roofing Budgets: The Power of Restoration

    Blog

    Maximizing School District Roofing Budgets: The Power of Restoration

    Read More
    New Orleans Convention Center Replaces 41-Acre Roof with Henry SPF Roofing System

    Project Profile

    New Orleans Convention Center Replaces 41-Acre Roof with Henry SPF Roofing System

    Read More
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        • Damp Proofing
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      • Housewrap & WRBs
        • Mechanically-Fastened WRB
        • Rainscreen
        • Self-Adhered WRB
        • WRB Accessories
        • WRB Sealants
      • Insulation
        • Continuous Insulation
        • Denim Insulation
        • DIY Insulation
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        • Roof Coatings - Aluminum
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        • Liquid-Applied Flashing
        • Mechanically-Fastened Flashing
        • Self-Adhered Flashing
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      • 1-2-3 Moisture Control System
    • Product Search
    Sturbridge Lakehouse Showcases Blueskin® VPTech™

    Project Profile

    Sturbridge Lakehouse Showcases Blueskin® VPTech™

    Read More
    HUD's Latest Energy Standards: A Builder's Guide

    Blog

    HUD's Latest Energy Standards: A Builder's Guide

    Read More
    Air Sealing Strategies for Success: Enhancing Home Performance Across Climate Zones

    Blog

    Air Sealing Strategies for Success: Enhancing Home Performance Across Climate Zones

    Read More
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  • Air Bloc 21 / 21FR

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Air-Bloc® 21 & 21FR

Air-Bloc 21 product rendering

Air-Bloc® 21 & 21FR

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Air and Vapor Barrier and Insulation Adhesive

Air-Bloc 21 is a trowel consistency, solvent-type, synthetic rubber-based insulation adhesive formulated for easy application on a range of construction surfaces. Designed to provide an effective air and vapor barrier when used as a full bed adhesive in conjunction with rigid foam or semi-rigid paper-faced insulation. Also available as a fire-resistive air and vapor barrier, Air-Bloc 21FR.

Sizes Available:

5 gal

Air-Bloc 21 and 21FR

  • Product Details
  • Technical & Installation
  • Related Products

Product Details

  • Product #HE021
  • Product #HE021FR

Air-Bloc 21 is a trowel consistency solvent-type, synthetic rubber-based insulation contact adhesive formulated for ease of application to construction surfaces such as masonry, concrete, gypsum board, and wood. Air-Bloc 21FR is fire-resistive.

  • Cures to a flexible film that resists air leakage
  • Smooth spreading
  • Can be applied at low temperatures
  • Seals around projections such as brick ties
  • Adheres to most types of rigid insulations

Designed to provide an air, vapor, and rain barrier when used as a full bed adhesive in conjunction with rigid foam or semi-rigid insulation such as paper-faced fibrous glass, polystyrene, mineral wool, or polyisocyanurate. Designed for resistance of air leakage against suction pressure from gusts and sustained wind loads.

  • Trowel-applied at temperatures as low as 10ºF (Air-Bloc® 21 and 21FR); Spray-applied at low temperatures on masonry, concrete, drywall and wood

  • Spreads smoothly on many surfaces, including masonry, concrete, gypsum board and wood

  • Seals around projections such as brick ties

  • Adheres to most types of rigid insulation

  • Cures to a flexible film that resists air leakage

Technical & Installation

  • Air-Bloc 21 Tech Data Sheets

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  • Air-Bloc 21FR Data Sheets

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  • Air-Bloc 21 SDS Sheet

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  • Air-Bloc 21FR SDS Sheet

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  • Air-Bloc 21 Spec Sheet

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  • Air-Bloc 21 DWG Zip Files

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  • AB-H101 Parapet Details – Brick Veneer/Steel Stud

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  • AB-H102 Parapet Details – Brick Veneer/CMU

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  • AB-H105 Shelf Angle Details – Brick Veneer/Steel Stud

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  • AB-H106 Shelf Angle Details – Brick Veneer/CMU

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  • AB-H111 Commercial Window Details – Window A – Brick Veneer/CMU

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  • AB-H112 Commercial Window Details – Window B - Brick Veneer/CMU

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  • AB-H109 Foundation Wall Details – Brick Veneer/CMU

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  • AB-H115 Plan Details – Brick Veneer/CMU Control/Expansion Joint

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  • AB-H117 Plan Details – Stucco/Steel Stud/CMU

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  • NFPA 285 Assemblies

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  • Use of Masonry Anchors

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  • Conversion Charts

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  • Coatings and Sealants

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  • Henry Living Building Challenge Red List

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FEATURED CEU

Competitive, Constructable, Complete Specifying Total Envelope Solutions in a Low-Bid World

A whopping 90% of construction litigation is driven by moisture intrusion. That intrusion occurs within just 5% of the total surface area of the envelope. The culprit is always the same: transitions and penetrations. The roof must transition to the wall, the wall must transition to the foundation, the punched openings must be tied into the air barrier, the insulation must be installed over the air barrier, and the cladding goes overtop that... and on and on. What’s the challenge? We need the envelope to perform as a unified whole, but we specify, design, bid, VE, install, and inspect it in phases, which always involves multiple manufacturers and multiple trades. The industry is clearly consolidating around “total envelope solutions” provided by three to five horizontally integrated conglomerates, but we have not yet reached the inflection point: integrated envelope specifications/warranties. What’s it going to take to do things better?


1 AIA LU/HSW
1 IIBEC CEH

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Construction Project Building Code Analysis: Generate a photo realistic image of building code analysts conducting a code analysis for a construction project, with building code books, code compliance review, architectural plans, and construction site overview visible; ensure the image is of high resolution for clear and detailed quality, with proper subject placement and clear edges.

Sustainability

  • Air-Bloc 21 Health Product Declaration

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  • Air-Bloc 21FR Health Product Declaration

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  • Air-Bloc 21 Adhesives and Sealants LEED Declarations

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  • Air-Bloc 21FR Adhesives and Sealants LEED Declarations

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  • Air-Bloc 21 Air Barriers – Liquid-applied LEED Declarations

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  • Air-Bloc 21FR Air Barriers – Liquid-applied LEED Declarations

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