Toprock® DD Plus
ROCKWOOL Toprock® DD Plus is a high-density bitumen-coated insulation board for low-slope roof applications. It is compatible as the substrate for torched, hot mopped and self-adhered membrane systems.
1/2
Popular applications
- Roof insulation
- Low slope roof insulation
About this product
ROCKWOOL Toprock® DD Plus is a high-density, bitumen coated stone wool insulation board for low-slope roof applications. Toprock DD Plus is compatible as the substrate for torched, hot mopped, or self-adhered membrane systems.
Toprock DD Plus is noncombustible, will not develop toxic smoke or promote flame spread even when directly exposed to fire. Also offering improved sound absorbency and dimensional stability, Toprock DD Plus is designed to maintain performance for the long-term as part of your building envelope.
- Noncombustible and fire resistant
- NCC (Non Combustible Core) Rated Roof Insulation
- Torched or hot mopped solutions
- Water and moisture repellent
- Dimensional stability to maintain performance
- Excellent acoustic performance
Why use stone wool insulation
- Stable long-term R-values for superior thermal performance.
- Naturally fire resilient stone, will not develop toxic smoke or promote flame spread, even when exposed to a fire.
- Stone wool provides excellent noise reduction and sound absorption to help you create quieter, more productive environments.
- Water resistant, stone wool does not rot or promote the growth of mildew, fungi or mold.
- Dual-density boards minimize damage from foot traffic and weather.
- Dimensionally stable, stone wool does not expand or contract due to temperature variances.
Applications
- Versatile insulation for low-slope roof applications.
- Compatible with torched or hot mopped membrane systems.
- SBS or modified bitumen membranes.
- A component of fire-rated low slope roof assemblies.
- Used in applications with very severe hail (VSH) conditions.
Product certificates
FM Approved
ULC Listed
Miami-Dade County Approved
UL Classified - CA/USA
Toprock® DD Plus sizes, dimensions & packaging
Find Toprock® DD Plus thickness, width, length and pack quantities—everything you need for accurate specification and ordering.
- All
- 7.6
- 9.5
- 11.4
- 13.3
- 15.2
- 17.1
- All
- 2
- 2.5
- 3
- 3.5
- 4
- 4.5
Specifications & testing
Explore Toprock® DD Plus specifications and test results, based on relevant industry standards.
| Name | Value | Unit | Test standard |
|---|---|---|---|
| NCC (Non Combustible Core) Rated Roof Insulation | Passed | FM 4470 | |
| Flame spread index | 0 | ASTM E84 | |
| Smoke Developed Index | 0 | ASTM E84 | |
| Combustibility of Materials at 750 °C | Non-combustible | ASTM E136 | |
| Determination of Non Combustibility of Building Materials | Non-combustible | CAN/ULC S114 | |
| Fire Tests of Roof Coverings | Class A | CAN/ULC S107-03 | |
| Heat Release Rate of Roofing Assemblies with Combustible Components | Class 1 | NFPA 276 | |
| Corrosion of Steel | Passed | ASTM C665 | |
| R-Value / inch @ 75 °F | 3.8 | hr.ft².F/Btu | ASTM C518 (C177) |
| RSI value / 25.4 mm @ 24 °C | 0.67 | m²K/W | ASTM C518 (C177) |
Toprock® DD Plus technical documents & resources
Download TToprock® DD Plus technical documents and resources, including the product data sheet, to support accurate specification and efficient project planning.
Toprock DD Plus flat roof insulation - Data sheet
Toprock tapered, flute filler and cant strip components
Construction Details - Industrial Commercial Masonry Construction with Exterior Insulation up to 4 stories
Construction Details - Existing Multi Wythe Masonry Retrofit with Interior Insulation
Construction Details - Commercial Steel Frame Construction Heavyweight Cladding
Construction Details - Wood Frame Construction Heavyweight Cladding
Toprock DD Plus_072200 Roof and Deck Insulation GUIDESPEC EN_US
Guidelines for cutting stone wool insulation
Related products
Explore more stone wool insulation solutions for similar applications.
Roof
Toprock® Tapered, Flute Filler and Cant Strips
Fabricated stone wool insulation components for low-slope roof applications are engineered for compatibility with a variety of membrane types, air/vapor barriers, fasteners, and adhesives, for both new construction and re-roofing applications.
Roof
Toprock® DD
ROCKWOOL Toprock® DD is a high-density uncoated insulation board for low-slope roof applications. It is compatible as the substrate for mechanically-attached membrane systems.
Roof
Multifix™
ROCKWOOL Multifix™ is a high-density insulation board with a mineral-coated fiberglass facer for low-slope roof applications. It is compatible as the substrate for torched, hot mopped, self-adhered, cold-adhered, and liquid membrane systems.
Attend a ROCKonnect Masterclass
Earn CEUs and gain expert insights into high-performance building envelope design—all in a live virtual format built for commercial building professionals. Learn from award-winning experts and apply real-world solutions to your next project.
Product support & insights
From expert technical guidance to real-world case studies and certified sustainability documents, access the tools and insights that support confident, high-performance building with stone wool insulation.
Speak to an expert
Contact our technical team for product, application, and building science support on stone wool insulation.
View our case studies
Discover some of our case studies to learn more about applications of our products in various projects across North America.
Access sustainability documentation
Explore ROCKWOOL’s certified products for transparency and sustainability, including EPDs, HPDs, GREENGUARD, and Declare labels.
