FM Approved Stone Wool Roof Board for US Commercial Roof Systems
TSW high-density roof board manufactured under FM Approvals Class 4470 (Hardroof 180 single SKU, verifiable on RoofNav). A1 non-combustible per EN 13501-1 + GB 8624. Direct China-factory pricing, 30-50% below European brands. Container MOQ from Qingdao Port. We are transparent about what we hold and what we do not — see the honest disclosure section below before specifying.
Why Stenvak for US Commercial Roof Projects
Direct China-Factory Pricing
Skip importer and master-distributor margins. 30-50% below European brand pricing for the same A1 fire-rated stone wool. Container MOQ from Qingdao Port direct to your US port of entry.
Real FM Approval, Not Marketing Claim
FM Approvals Class 4470 listing is for the Hardroof 180 SKU specifically — verifiable on the FM RoofNav directory. We also hold CCS Works Approval (valid through 2028), CE EN 13162 (Intertek NB 2649), KS L 9102, and GOST. Every certificate has a downloadable PDF.
Independent Lab Tested
Tested by SGS and Intertek (NB 2649) for CE EN 13162 conformity. Detailed test reports available on request — your engineers can independently verify any spec before approving the product.
Manufacturing Since 2011
Powered by Taishi® — more than a decade of stone wool production, 600,000 tons annual capacity, ISO 9001 / 14001 / 45001. Stenvak is the authorized Taishi distributor for international markets.
Roof System Product Lines
TSW Roof Board (Hardroof 180 Single SKU)
Dense stone wool roof board sized for foot-traffic during installation and standard membrane bonding. The Hardroof 180 SKU specifically is FM Approvals Class 4470 listed. Hydrophobic surface treatment to resist incidental moisture during construction.
TSF Composite Slab
Pre-faced composite slab for fast roof installation on automated panel production lines. Combines core insulation board with factory-bonded facing for membrane systems.
Standards & Certifications (Verified)
All certificates listed below are physically on file with downloadable PDFs. None are pending or in-progress.
What We Hold — and What We Do Not
We believe spec-conscious US commercial buyers deserve honest answers up front, not after the proforma invoice. Here is exactly what is on file today, and exactly what is not.
What We Currently Hold
- FM Approvals Class 4470 listing for the Hardroof 180 SKU specifically (verifiable on RoofNav)
- Class A non-combustible per international standards (EN 13501-1 Class A1 + GB 8624 A级)
- CE EN 13162 conformity assessment by Intertek (Notified Body 2649), with PDF on file
- KS L 9102 (Korea) and GOST Fire Safety (Russia) certificates with downloadable PDFs
What We Do Not Currently Hold
- ASTM C612 test report (US mineral fiber thermal insulation standard) — not currently on file
- ASTM E84 surface burning characteristics report — not currently on file
- Factory-level FM Approved designation — only the Hardroof 180 product SKU is FM listed, not the factory program
- NFPA 285 wall assembly test report — not applicable to roof scope but listed here for full transparency
If your project requires a spec we do not currently hold, we will tell you up front and you can choose accordingly. We do not pursue or imply compliance we cannot evidence with a PDF on file.
Commercial Roof Use Cases We Support Today
Low-Slope Commercial Roof
Single-layer or two-layer insulation under bonded or mechanically fixed membrane (TPO, PVC, EPDM). TSW density sized for foot-traffic and wind-uplift. Local engineer of record verifies wind-uplift assembly based on tested system data.
Tapered Roof Insulation Layups
Stone wool board layered with tapered polyiso or used as a non-combustible cover board over polyiso. Provides A1 fire performance at the membrane interface where the local code requires non-combustible cover.
Re-Roofing & Tear-Off Replacement
Direct supply for re-roofing projects where the spec calls for A1 non-combustible insulation. Container shipments timed to project mobilization — typical lead time 35-45 days FOB Qingdao Port.
High-Wind Coastal Roof Systems
Higher-density TSW (≥160 kg/m³) for wind-uplift-sensitive coastal commercial roofs. Hydrophobic treatment >98% resists driving rain during construction window.
Request a Commercial Roof Quote with Honest Disclosure
Sample available · Free quote within 24 hours · MOQ 1 container · FM listing PDF + EN 13501-1 report on request · Shipping from Qingdao Port to any US East Coast or West Coast port