PERM-A-BARRIER® S100 Sealant

One part neutral curing, ultra low modulus silicone sealant

Product Description

PERM-A-BARRIER® S100 Sealant is a one part neutral curing, ultra low modulus silicone sealant that reacts with atmospheric moisture to form a durable and flexible building sealant. S100 sealant is designed for a variety of uses with GCP Applied Technologies' air and weather barrier systems. The Volatile Organic Compound (VOC) content is <100 g/L.

Typical Air and Vapor Barrier Application

Product Advantages

  • 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 


S100 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
  • For sealing between window flanges and the air and weather barrier system.

Application Procedures

Safety, Storage and Handling Information

Refer to product label and Safety Data Sheet (SDS) 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 before use. SDSs are available at

S100 Sealant is available in 29 fl oz (0.858 L) cartridges. S100 Sealant has a shelf life of 12 months from the date of manufacture when stored in the original unopened cartridges between 40°F (4°C) and 80°F (27°C).

Surface Preparation

All surfaces must be clean, dry and free from dirt, grease oil, dust or other contaminants. S100 Sealant may be applied at temperatures of 20°F (-6.67°C) and above. When installing S100 in temperatures below 40 °F (4°C) the material should be kept in a heated truck or trailer prior to application.

Product Application

Apply S100 Sealant with a caulking 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.


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.


S100 Sealant should not be used in the following applications:

  • Below grade
  • End of day terminations
  • Under GCP air and weather barrier membranes and flashing, except when used as a joint treatment for GCP fluid-applied membranes.
  • When terminating against PERM-A-BARRIER® VPS
  • Not for use with building materials that bleed oils, plasticizers or solvents
  • Firestopping applications


Unit size 29 fl oz (0.858 L) cartridge
Packaging 10 cartridges/carton; 42 cartons/pallet

Physical Properties

Color Green
Tack Free Time 1-2 hours
Cure Time 7-14 days*
Full Adhesion 7-14 days*

*Curing and full adhesion time will vary depending on temperature and humidity

Physical Properties

Typical Cured Properties After 7 days cure at 77ºF (25ºC), 50% R.H.

Hardness (Shore A) 20 ASTM C661
Elongation 1000% ASTM D412
Modulus @ 100% Elongation 30 psi ASTM D412
Ultimate Tensile Strength 120 psi< ASTM D412
Tear Strength 30 pli ASTM D624 | North America customer service: 1-877-4AD-MIX (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 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.

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

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.
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 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: 2023-06-29