Frontrock®
ROCKWOOL Frontrock® is a noncombustible stone wool insulation board engineered to be used in mechanically-fastened exterior insulation and finish system (EIFS) designs.
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Popular applications
- Exterior wall insulation
- EIFS
About this product
ROCKWOOL Frontrock® is a stone wool insulation board designed for mechanically attached Exterior Insulation and Finish Systems (EIFS).
Frontrock is noncombustible and supports improved energy efficiency, moisture control and acoustic performance for both new construction and retrofit projects.
Frontrock provides consistent density and high compressive strength, and is a component of tested and certified EIFS in the U.S. market.
- Noncombustible and fire resistant
- Water and moisture repellent
- Vapor Permeable to support drying
- Excellent acoustic performance
- Dimensional stability to maintain performance
Why use stone wool insulation
- Non-combustible, Class A insulation, stone wool works to contain a fire and prevent its spread.
- Provides a stable substrate without causing undesirable stress on the EIFS lamina.
- Vapor permeable enabling wall systems to have superior drying potential, and meets industry standards for drainage efficiency (ASTM E2273).
- Manufactured with tight dimensional tolerances and simple to cut on the job site or in prefabricated EIFS applications.
- Manufactured from one of the world’s most abundant raw materials without the use of blowing agents or toxic flame retardants.
Applications
- A component of tested and certified EIF systems.
- Meets requirements for use in fire-resistance-rated construction and any construction type.
- Helps to meet local building codes that add restrictions to combustible materials.
- Allows for construction without height or setback limitations.
- Ideal for new build or retrofit projects in WUI (wildland urban interface) zones.
Product certificates
UL Classified - CA/USA
Declare
Frontrock® sizes, dimensions & packaging
Find Frontrock® thickness, width, length and pack quantities—everything you need for accurate specification and ordering.
- All
- 6
- 8
- 10
- 12
- 14
- 16
- 20
- All
- 1.5
- 2
- 2.5
- 3
- 3.5
- 4
- 5
Specifications & testing
Explore Frontrock® specifications and test results, based on relevant industry standards.
| Name | Value | Unit | Test standard |
|---|---|---|---|
| Mineral Fiber Block and Board Thermal Insulation | Type IVA Compliant | ASTM C612 | |
| Mineral Fiber Thermal Insulation for Buildings | Type 1 Compliant | CAN/ULC S702 | |
| 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 | |
| Corrosion of Steel | Passed | ASTM C665 | |
| R-Value / inch @ 75 °F | 4 | hr.ft².F/Btu | ASTM C518 (C177) |
| RSI value / 25.4 mm @ 24 °C | 0.7 | m²K/W | ASTM C518 (C177) |
| Determination of Fungi Resistance | Passed | ASTM C1338 |
Frontrock® technical documents & resources
Download Frontrock® technical documents and resources, including the product data sheet, to support accurate specification and efficient project planning.
Frontrock exterior insulation finish system (EIFS) - Data sheet
ROCKWOOL Frontrock® products are semi-rigid stone wool insulation boards that are noncombustible and fire resistant, and will not develop toxic smoke or promote flame spread, even when directly exposed to fire.
EIFS with ROCKWOOL stone wool insulation brochure
Exterior Insulation and Finish Systems (EIFS) with ROCKWOOL stone wool insulation provide added performance to traditional systems that use rigid foam.
EIFS with ROCKWOOL stone wool insulation brochure - Canada
Exterior Insulation and Finish Systems (EIFS) with ROCKWOOL stone wool insulation provide added performance to traditional systems that use rigid foam
Dimensional stability of rigid board insulation products
Investigations often uncover irreversible dimensional changes in rigid foam board insulation, like EPS, XPS, and ISO.
Guidelines for cutting stone wool insulation
Properly cutting stone wool insulation ensures fit and maintains performance, preventing safety and efficacy issues.
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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.
