PERM-A-BARRIER® Universal Flashing & Sealant Data Sheet

PAB Universal Flashing & Sealant is designed for a variety of uses with GCP’s air and weather barrier systems.

Product Description

PERM-A-BARRIER® Universal Flashing & Sealant is designed for a variety of uses with GCP’s air and weather barrier systems.


PERM-A-BARRIER® Universal Flashing & Sealant is ideally suited for the following uses:

  • Sealing of finished terminations, edges of patches and overlaps in detail areas
  • Sealing penetrations through GCP air and weather barrier systems, such as plumbing or ductwork
  • As a sheathing joint treatment for GCP fluid-applied air and weather barrier membranes
  • Provides flashing at window and door rough openings
  • Counter flashes waterproofing and air barrier membranes
  • For AMMA 714-19, Level 3 compliant Liquid Flashing.

Product Advantages

  • Asphalt Compatible
  • No primer - fast and easy application with minimum surface preparation
  • No staining or residue rundown
  • High movement capability
  • Adhesion - Strong adhesion to common construction substrates, such as wood, block, concrete, OSB, glass mat sheathing, metal, vinyl and PVC
  • Compatibility - Compatible with most GCP air and weather barrier systems

Application Procedures

Safety, Storage and Handling Information

Users must read and understand the product label and Safety Data Sheets (SDS’s) for each system component before use. All users should acquaint themselves with this information prior to working with the material. Carefully read detailed precaution statements on the product labels and SDS’s before use. The most current SDS’s can be obtained from the GCP web site at

PERM-A-BARRIER® Universal Flashing & Sealant is available in 20 fl oz (0.59 L) sausages and has a shelf life of 12 months from the date of manufacture when stored in the original unopened sausages between 40°F (4°C) and 80°F (27°C).

The Volatile Organic Compound (VOC) content is <20 g/L.

Surface Preparation

All surfaces must be clean, dry and free from dirt, grease oil, dust or other contaminants. PAB Universal Flashing & Sealant may be applied at temperatures 20°F (-6.67°C) and above.

Curing Time: PERM-A-BARRIER® Universal Flashing & Sealant is a moisture cure sealant. Ambient air at 50% relative humidity and at 73°F, Silyl
Modified Polyether sealants will generally skin in less than one hour and cure 1/16 of an inch per day. Lower temperature and lower relative humidity will significantly increase the skin time and cure time.

Product Application

Apply PERM-A-BARRIER® Universal Flashing & Sealant with a caulking or sausage gun. When used as a seal for finished terminations, edges of patches and overlaps in detail areas, level the bead with a trowel to a minimum 0.125 in. (3 mm) thickness and 0.5 in. (13 mm) to 1 in. (25 mm) width.

When sealing penetrations, apply a 1 in. (25 mm) fillet to the base of the penetration and overlap onto the GCP air and weather barrier material and penetrant a minimum of 2.5 in. (64 mm).

When used to treat sheathing joints for GCP fluid-applied air and weather barrier membranes, completely fill the sheathing joint with sealant and then install a scratch coat of sealant with a margin trowel or similar onto the face of the sheathing approximately 1 in. (25 mm) on each side of the sheathing joint. Once the sealant is tack free, the fluid applied membrane may be applied, refer to the applicable product data sheets for detailed application instructions.

When used to treat rough opening of window/door penetrations, apply continuously at a minimum thickness of 25 mils, extended a minimum of 3” onto the surrounding wall surface.


Clean tools and equipment with mineral spirits. Mineral spirits is a combustible liquid and should be used only in accordance with the mineral spirits manufacturer’s safety recommendations. Do not use solvents to clean hands or skin.


    PERM-A-BARRIER® Universal Flashing & Sealant should not be used in the following applications:

    • PERM-A-BARRIER® Universal Flashing & Sealant has a maximum in-service temperature of 200° F (93°C).
    • As a sealant over PERM-A-BARRIER® VPS 30. 
    • Not for use with building materials that bleed oils, plasticizers or solvents
    • Firestopping applications
    • Below grade


    Property Typical Value
    Color Black
    Tack Free Time or skin time 1-2 hours
    Cure Time 7-14 days*
    Full Adhesion 7-14 days*

    Typical cured properties after 7 days cure at 77ºF (25ºC), 50% R.H.
    Lower relative humidity and temperature will significantly extend the curing time. 

    Property Typical Value Test Method
    Hardness (Shore A) >35 ASTM C661
    Elongation >600% ASTM D412
    Ultimate Tensile Strength 150 psi ASTM D412
    Modulus @ 100% Elongation 50 psi ASTM D412
    Elastomeric Joint Sealants Class 50 ASTM C920
    Water Vapor Permeance 15 perms ASTM E 96B1
    Water Penetration Around Nails Pass ASTM D 1970 section 7.9/AAMA 714-19
    Crack Bridging Ability Category I, Pass, ASTM C 1305/AAMA 714 section 5.6

    *Curing and full adhesion time will vary depending on temperature and humidity. lower temperature and humidity can significantly increase the curing time. 
    1. Tested at 10-12mils thick | North America Customer Service: +1 (877) 423 6491

    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 and BITUTHENE are trademarks, 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.

    © Copyright 2018 GCP Applied Technologies Inc. All rights reserved.

    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 United States. 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 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: 2024-06-21