Tremco Willseal STC Sound-Control Joint Seal

Name: Tremco Willseal STC Sound-Control Joint Seal
Brand: Tremco
SKU: WILLSEAL-STC

Price on request

Project-quoted product — pricing depends on size, profile and quantity. Call 250-233-3000 or email order@canopussupply.com. Pickup in North Vancouver; ships across Canada and the USA.

Authorized Distributor

Sized & Quoted Per Project

Pickup & Delivery Across BC

Trade & Professional Grade

Need volume pricing, system advice or a trade account?

Call 250-233-3000 Contact / Trade Account

Technical Documentation

Technical Data Sheet
TDS (PDF)

Always confirm values against the current TDS & SDS before specifying or ordering.

📐 Project-Quoted Product — North Vancouver, BC. Expansion joint systems are sized to your joint width, depth and run length and priced per project. Send us your joint schedule and we confirm pricing and lead time within one business day. Call 250-233-3000 or request a project quote.

Request a Project Quote

Willseal STC — Sound-Control Joint Seal

Compressible, acoustically tested joint sealant for static interior joints | Brand: Tremco (Willseal) | Model: Willseal STC

Willseal STC is a compressible joint sealant for static interior joints that need sound control, built from fire-resistant, acrylic-impregnated polyurethane foam with a factory silicone coating on one, two, three or four sides. The foam is black; the silicone comes in standard Spectrem colours. Browse the full Tremco range at Canopus Supply.

Professional note: Willseal STC is for static joints only — it is not rated for dynamic movement or traffic. Tested to ASTM E90: STC 51 in a 55-STC wall and OITC 40 in a 42-OITC wall.

Performance Highlights

Sound Transmission STC 51 in a 55-STC wall (ASTM E90)	Outdoor-Indoor Transmission OITC 40 in a 42-OITC wall (ASTM E90)	Joint Sizes 1/2 in. to 6 in.
Stick Length 6.5 ft	Temperature Stability −40 °F to 248 °F short term	Silicone Coating 1, 2, 3 or 4 sides; standard Spectrem colours

Typical Applications

Window-to-wall connections
Partitions and curtain wall installations
Offices, conference and quiet rooms

Limitations

Static joints only — not for dynamic or traffic-rated joints; confirm against the current TDS.
Not for submerged joints; confirm against the current TDS.

Health & Safety

The Safety Data Sheet for Willseal STC is aligned with GHS requirements. Refer to the manufacturer's Safety Data Sheet for complete information.

Purchasing Note: All sales are intended for professional and trade purchasers. Expansion joint products are ordered to project-specific sizes — confirm joint width, depth, movement class, quantity and delivery requirements when requesting your quote. Product use and installation are the responsibility of the purchaser and installer.

Sizing an expansion joint? Contact Canopus Supply — 250-233-3000

Tremco — Professional Sealants & Waterproofing Systems

Technical information is provided for professional reference only. Product selection, joint sizing, substrate preparation, application and final performance remain the responsibility of the purchaser, installer and project specifier. Always confirm against the current TDS, SDS, project specification and site conditions before use.

Available at Canopus Supply — North Vancouver, BC. Authorized distributor in British Columbia.