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Roxul Insulation FAQ

Roxul Stone Wool

What is stone wool?

bulletRoxul insulation is a rock-based mineral fiber insulation comprised of Basalt rock and Recycled Slag. Basalt is a volcanic rock which is abundant in the earth, and slag is a by-product of the steel and copper industry. The minerals are melted and spun into fibers.

What happens if Roxul insulation gets wet?

bulletRoxul insulation is moisture resistant yet vapor permeable. In the event the insulation becomes damp or wet, the insulation, when thoroughly dried, will maintain the original performance characteristics.

Are Roxul products mold resistant?

bulletRoxul products are inorganic which provide no food source for mold to grow. Roxul products are tested to ASTM C1338 – Standard Test for Determining Fungi Resistance – and pass with zero fungal growth.

Are Roxul products rodent resistant?

bulletThere is no test method to determine whether or not any product is rodent resistant. Roxul’s reputation as a rodent resistant insulation is mainly based on word of mouth and lack of negative feedback from numerous customers who use our products in “cottage country”. The majority of these applications are exposed floors, which are mainly above grade allowing rodents easy access to the insulation. As Roxul insulation has a higher density than other insulations and a multi-directional fiber orientation, rodents tend to avoid burrowing and nesting in Roxul insulation.

Does Roxul make blowing wool insulation?

bulletRoxul insulation is only manufactured in batt, board and pipe forms.

Basic Acoustic

Can Roxul soundproof my walls or ceilings?

bulletRoxul products can help to reduce airborne sound within your home when installed in both walls and ceilings. Possible sources of sound transfer can occur between adjoining floors, walls, ceilings and through electrical receptacles and furnace vents. Most sound in the home is airborne sound generated by music, voices, ambient noise, etc. Impact sound is the result of foot traffic or falling objects. If reducing impact sound is the primary concern, additional measures such as the addition of resilient channels or a sound absorbing layer between the sub floor and the joists are recommended. If you require a specific STC (Sound Transmission Class) Rating then you can contact us for for more information.

What is an STC Rating?

bulletA STC (Sound Transmission Class) rating is a number rating of an assembly’s ability to withstand airborne sound transfer at different frequencies. Generally, a higher STC rating will block more noise from transmitting through a partition wall or ceiling. If you require an STC rating, please contact us.

To reduce sound transmission is it better to double up on the Roxul Safe ‘n’ Sound or keep the air space (non-bridging gap)?

bulletDoubling the insulation will not double the STC value as an STC rated assembly incorporates all components of the structure with the insulation being one component of that system. Doubling the insulation will increase the STC rating somewhat and to determine by how much please contact us.


Can Roxul insulation go around the pipe of a gas fireplace where the pipe meets the exterior wall?

bulletAlthough Roxul is a non-combustible material, which has a melting point of 2150 ºF, Roxul does not have any approvals for this application. We recommend that you contact the manufacturer and/or follow local codes for this application.

What is the fire rating of a Roxul product?

bulletA fire rating is determined by testing a complete system, such as a wall with all its components, and not the insulation alone. Roxul products are non-combustible and have an approximate melting temperature of 2150ºF but cannot hold a fire rating by itself, as is the case with any other insulation. If you require a specific fire rating, please contact us.

Environmental - Health & Safety

Is there any "off-gassing" from Roxul products?

bulletNo, “off-gassing” is a term that was started when blowing agents were utilized in insulation materials and Roxul does not incorporate blowing agents in their products. The organic binders that are used in the manufacturing process are introduced to a high temperature curing phase, virtually eliminating volatile components.


What is the difference between ComfortBatt® and Roxul Safe ‘n’ Sound™?

bulletThe difference between ComfortBatt® and Roxul Safe ‘n’ Sound™ is density (weight) and batt size. Roxul Safe ‘n’ Sound™ is denser than ComfotBatt® and is manufactured to an approximate 3 inch thickness.

Can Roxul Safe ‘n’ Sound™ be used for thermal applications?

bulletSafe ‘n’ Sound™ is intended for acoustical and added fire resistance in interior wall applications. Interior walls have no R-value requirements so R-value information is not tracked or published for Safe ‘n’ Sound™. We recommend ComfortBatt® and RoxulPlus® be used in applications requiring thermal value.

Is a vapor barrier required on all applications using mineral wool insulation?

bulletA vapor barrier is only required when the application involves an exterior wall. A vapor barrier is meant to block water vapor transfer from the warm side and condense on the cold side of the wall. A vapor barrier is always attached to the warm side.

Will Roxul insulation products pass building code inspections?

bulletYes, the insulation will pass building code inspections as Roxul tests to CAN/ULC S-702 Standard For Mineral Fibre Thermal Insulation For Buildings, and ASTM C665 Standard Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing as required by the NBCC (National Building Code of Canada), the ICC (International Code Council) and IBC (International Building Code) . In addition, there are CCMC numbers on the ComfortBatt® and Roxul Plus® products. As a result, Roxul has met all the criteria needed for Canadian and United States residential codes.

Can I use ComfortBatt® in my attic?

bulletYes, ComfortBatt® is designed for your exterior walls and attics. Code requirements for attic R-value will vary from province to province, although, R-40 is quite common. To achieve R-40 in your attic using ComfortBatt®, it is recommended to use two layers of R-22 for a total of R-44. Lay the first batt between the roof trusses, then the second layer perpendicular to the first so as to cover up the roof trusses.

How much clearance is needed when insulating around pot/recessed lights?

bulletInsulating around pot lights can vary by manufacturer, as well as the type of pot light and it may be covered under your local building codes. Roxul has no set requirements for insulating around pot lights and would always recommend following the manufacturers recommendations and/or your local building codes.


What is the Specific Heat for Roxul products?

bulletThe heat capacity of Roxul products at 50ºC is 0.8kJ/kgºK (0.191 BTU/lbºF).

Will Roxul corrode metals?

bulletNo. Roxul products have been tested and conform to the stainless steel stress corrosion specification as per the ASTM test methods C871 and C692.

FAQ Information from Roxul

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