TL-0016 — Penetrations Through PERM-A-BARRIER® Systems Technical Letter
PERM-A-BARRIER® Liquid Applied and PERM-A-BARRIER® Sheet applied 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 (GCP) 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.
|Heckman Pos-I-Tie with insulation||No Leakage||No Leakage|
|Heckman Pos-I-Tie without insulation||No Leakage||No Leakage|
|Hohman & Bernard DW-10 Anchor||No Leakage||No Leakage|
|Hohman & BernardCorrugated Brick Tie||No Leakage||No Leakage|
|Wire-Bond RJ-711 Adjustible Veneer Anchor||No Leakage||No Leakage|
*Consult your technical representative for selected product evaluation report.
The following measures must be included to achieve this seal:
- Ensure all fasteners are secured to a stud or other stable substrate and that the fastener head is tightened snug to the air barrier.
- 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.
- 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.
- 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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GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 450, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6.
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Last Updated: 2022-04-27