Tremco Willseal STC Sound-Control Joint Seal

📐 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.