Penetrations Through PERM-A-BARRIER® Systems

Technical Letter 16

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PERM-A-BARRIER® Liquid, PERM-A-BARRIER® VPL, PERM-A-BARRIER® Wall and PERM-A-BARRIER® VPS Membranes

For an air barrier system to be effective, the air barrier material must be continuous onto the substrate they are applied, without any voids, gaps or holes. Often it may be more convenient or cost effective, from a design and application perspective, to penetrate an air barrier assembly after installation of the air barrier. Appropriate care must be taken to ensure continuity of the air barrier assembly when an installed air barrier will be penetrated. 

Typical penetrations include anchors, brick ties, and screws. The best practice is to limit or eliminate the number of penetrations through an air barrier assembly, however, it is not always feasible to eliminate all penetrations.

GCP Applied Technologies has conducted in-house testing on PERM-A-BARRIER® Air Barrier Systems with a number of penetrations installed through the previously installed air barrier. The testing included an evaluation of both air leakage and water penetration, in accordance with ASTM E 1186 Standard Practices for Air Leakage Site Detection in Building Envelopes and Air Barrier Systems and ASTM E 331 Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference. 

The results demonstrated that GCP PERM-A-BARRIER® Air Barrier Systems provide a seal with the penetrants tested that prevented air and water leakage past the air barrier. 

The following is a chart of the types of penetrants that have been evaluated by GCP and when installed correctly as per manufacturers written instructions can provide an air and watertight seal without additional sealant.

FASTNER TYPE E1186 E331
Hohman & Bernard DW-10 Anchor No Leakage No Leakage
*Hohman & Bernard Corrugated Brick Tie No Leakage No Leakage
*Wire-Bond RJ-711 Adjustable Veneer Anchor No Leakage No Leakage
**Heckman Pos-I-Tie with insulation No Leakage No Leakage

*Not evaluated with PERM-A-BARRIER® Wall Membrane
**Not evaluated with PERM-A-BARRIER® VPS

The following measures must be included to achieve this seal:

  1. Ensure all fasteners are secured to a stud or other stable substrate and that the fastener head is tightened snug to the air barrier. 
  2. If a fastener is not secured to a stable substrate, then the fastener shall be removed entirely and the air barrier shall be repaired with a min. 4 inch by 4 inch patch of the original air barrier material or appropriate sealant.
  3. If a fastener is over-tightened such that the head of the fasteners is embedded into the air barrier, then a min. 4 inch by 4 inch patch of the original air barrier material or appropriate sealant must be installed over the fastener.
  4. All self-tapping screws should have a tap (tip) diameter no greater than the pilot (shaft) diameter.

Brick ties that allow for a tight seal between the air barrier and the brick tie, such as brick ties listed above, have been proven to provide an effective airtight and watertight seal without additional sealant. While these penetrations, in conjunction with PERM-A-BARRIER®Air Barriers, provide a seal, variability in installation may warrant the use of a sealant. When using brick ties other than those listed above, GCP recommends using an appropriate sealant to detail the brick tie penetrations.

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We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

PERM-A-BARRIER is a trademark, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

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GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 475, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.
This document is only current as of the last updated date stated below and is valid only for use in the Canada. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on www.gcpat.com. Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2022-03-22

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