Verified construction product
ROCKWOOL Toprock DD
A dual-density, high-density uncoated stone wool insulation board for low-slope roof applications as a substrate for mechanically attached membrane systems.
Published technical facts
Specification record
- Flame spread index (ASTM E84)
- 0 index
- FM 4470 NCC roof insulation
- Passed (manufacturer-reported)
- Material
- Dual-density uncoated stone wool roof insulation board
- R-value per inch at 75 °F (ASTM C518)
- 3.8 hr·ft²·°F/Btu
Decision summary
What professionals need first
- What is this product?
- Dual-density stone wool roof insulation board for mechanically attached membranes
- Where is it used?
- Low-slope roof insulation. Documented as a high-density uncoated stone wool substrate for mechanically attached TPO, PVC, EPDM or KEE membrane systems on low-slope roofs.
- Who manufactures it?
- ROCKWOOL
- Product category
- Building Envelope
Construction use
Construction applications
Low-slope roof insulation
Documented as a high-density uncoated stone wool substrate for mechanically attached TPO, PVC, EPDM or KEE membrane systems on low-slope roofs.
Official source
Specification support
Technical resources
Official documentation grouped by purpose. Duplicate links are omitted.
Product Data Sheets
Supporting Technical References
Evidence-backed attributes
Sustainability & compliance
Only manufacturer-documented or independently verified attributes appear. Evidence class distinguishes manufacturer declarations from third-party verification, certification, and building-rating contribution documentation. Product LEED or WELL certification is not implied.
Certifications & design standards
- FM 4470 NCC ratingToprock DD product page / technical data
NCC (Non Combustible Core) Rated Roof Insulation — Passed (manufacturer-reported)
FM 4470
Product certification
Connected network
Relevant connections
Direct manufacturer and documented system relationships only. Manufacturer exhibition participation does not imply that this product was exhibited.
- ManufacturerROCKWOOL
Company construction expertise, related products and verified exhibition participation.
- Same manufacturerROCKWOOL Cavityrock
Additional published ROCKWOOL product profile. Not a compatibility claim.
- Same manufacturerROCKWOOL Comfortbatt
Additional published ROCKWOOL product profile. Not a compatibility claim.
- Same manufacturerROCKWOOL Comfortboard 80
Additional published ROCKWOOL product profile. Not a compatibility claim.