Choose a subject of interest


ROXUL Stone Wool

What is stone wool?

ROXUL insulation is a rock-based mineral fiber insulation comprised of Basalt rock and Recycled Slag. Basalt is a volcanic rock(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?

ROXUL 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?

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

Are ROXUL products rodent resistant?

There 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”.

Does ROXUL make blowing wool insulation?

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


Basic Acoustic

Can ROXUL soundproof my walls or ceilings?

ROXUL products can help 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 and so forth. . 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, please call ROXUL at 1-800-265-6878 for more information.

What is an STC Rating?

A 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 ROXUL at 1-800-265-6878

To reduce sound transmission is it better to double up on the ROXUL SAFE‘n’SOUND® or keep the air space (non-bridging gap)?

Doubling 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 ROXUL at 1-800-265-6878.



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

Although ROXUL is a non-combustible material with a melting point of up to 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?

A 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 ROXUL at 1-800-265-6878.


Environmental - Health & Safety

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

No.  “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 at a high temperature curing phase, virtually eliminating volatile components.



What is the difference between COMFORTBATT® and ROXUL SAFE‘n’SOUND®?

The difference between ROXUL COMFORTBATT® and ROXUL SAFE‘n’SOUND® is density (weight) and batt size. ROXUL SAFE‘n’SOUND® is denser than COMFORTBATT® and is manufactured to an approximate 3 inch thickness. 

Can ROXUL SAFE'n'SOUND® be used for thermal applications?

SAFE'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® be used in applications requiring thermal value.

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

A vapor barrier is only required when the application involves an exterior wall and is required by code. 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?

Yes, 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 ROXUL COMFORTBATT® 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?

Yes, COMFORTBATT® is designed for your exterior walls and attics.  Code requirements for attic R-value will vary by region, 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?

Insulating around pot lights can vary by manufacturer, as well as the type of pot light being installed. This information 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.



Can wet insulation be reused after drying?

ROXUL stone wool is treated to be water-repellent and its thermal properties will be restored after drying, provided there is no physical and chemical degradation. However, when the risk of contamination with chlorides cannot be avoided, the insulation material should be removed and replaced with dry insulation to minimize corrosion risk

How can I determine the insulation type and thickness that I require?

ROXUL technical services team can assist you in determining the thickness required to meet personnel protection requirements and to minimize heat loss. If you provide the technical services staff with the following design conditions, they can determine the correct requirements. For inquiries, please contact 1-800-265-6878.
- Nominal Pipe size
- Operating temperature
- Ambient conditions (temperature and wind speed)
- Jacketing material

Will ROXUL prevent Corrosion under insulation?

ROXUL industrial insulation will not induce corrosion and complies to all relevant ASTM corrosion standards. For more information on designing and installing a system that will minimize corrosion risk, please see our ‘Corrosion Under Insulation’ brochure

How will ROXUL help protect personnel working at an industrial facility?

Surface temperatures in excess of 60°C can lead to skin burns if the surface is touched. All accessible installation components should be designed to prevent people being exposed to the risk of injury by burns. ROXUL stone wool is one of the safest insulation materials in the event of a fire as it is non-combustible, does not promote flame spread, and no harmful fumes or gases will be released.

What are the most important factors that need to be considered when selecting an industrial insulation material?

The most important factors in an industrial facility are reducing heat loss, protecting personnel and equipment, frost protection, process control, reducing CO2 emissions, fire protection, and acoustical performance. All of these factors need to be taken into consideration when choosing an insulation and designing an appropriate system.

How to install ROXUL industrial products?

Pipe insulation can be installed with or without impaling pins and is usually installed with a jacketing system and band strapping.
Board insulation is installed with impaling pins and/or between stiffeners. A fastener guide is available through the ROXUL technical services staff.