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Frequently Asked Questions

Frequently Asked Questions

Below you will find the answers to see some of our most frequently asked questions - about the ROCKWOOL Group, about our solutions and our product categories.

General questions

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.

Walls

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

ROXUL SAFE’n’SOUND® is designed specifically for sound attenuation. The density and thickness of the product is optimised for acoustical performance. SAFE’n’SOUND® is not branded with an R value as it’s typically used in interior partition walls that do not require an R value. Therefore, SAFE’n’SOUND® would not pass an inspection if used in an exterior wall.

ROXUL COMFORTBATT® is used in exterior walls and so the quality control performed on the product is done to meet the standards required per R value labelling. It is also branded with an R value and so would pass a home inspection so long as the R value as per the building code is met. Like all our products, ROXUL COMFORTBATT® is made out of mineral wool and therefore offers some acoustical performance.

What fastener would I use with ROXUL COMFORTBOARD®?

The fastener type used should be appropriate to the substrate [concrete wall, wood stud, etc.] Please refer to the fastener guideline document found on our website. 

Can glue or an adhesive be used to attach ROXUL COMFORTBOARD®?

You can use a construction grade glue/adhesive to temporarily attach the insulation in a situation where the stud wall is being built on top/after the insulation. In this case, the stud wall would hold the insulation in place. We do not recommend permanently attaching the insulation using glue as this may cause the insulation to peel/fall off once the glue dries.

May I still use ROXUL SAFE’n’SOUND® in an exterior wall?

Yes, you can but if inspected, would not pass the inspection as a product with a labelled R value is required.

Roofs

Floors & Ceilings

Attics

How would I insulate my attic?

We recommend the use of ROXUL COMFORTBATT® to insulate an attic. The insulation used would depend on the constraints of the application [space/required R value as per building code, etc]. Be sure to use a vapour control layer when required. Please see our YouTube channel for how-to videos as well as the DIY Energy Star guide for more information.  

How would I insulate my crawl space?

You can insulate your crawl space using ROXUL COMFORTBOARD® or COMFORTBATT®. The specific type of insulation used would depend on the constraints of the application [space/required R value as per building code, etc]. Be sure to use a vapour control layer when required.  Please see our YouTube channel for how-to videos as well as the DIY Energy Star guide for more information.  

Do you offer a loose-fill product for attics?


We used to offer a product called RockFill®, however it was a business decision to discontinue this product.  Due to the nature of our product there were also issues with the blowing equipment and so we discontinued RockFill®. 

Fire Protection

Sound Absorption

Does the fibrous nature of your products help with sound proofing? How well does ROXUL sound proof?

ROXUL is designed to reduce sound attenuation through the wall which is the process of reducing the sound energy through the wall. Sound proofing is the process of keeping sound contained in a space preventing the sound moving from one part of the building to another. ROXUL AFB®, SAFE’n’SOUND®, CAVITYROCK®, COMFORTBOARD® 80/110, CURTAINROCK®, SAFE®, and ROCKBOARD® all provide sound attenuating properties. Please see product technical data sheets for specific information. 

How much sound can I expect to be decreased with sound attenuation?

Sound “loudness” is measured in decibels [dB]. Sound frequency is the number of vibrations caused by the sound per unit time. The amount of sound decreased is expressed as an STC rating which is a measure of a material’s or an assembly’s ability to resist sound transfer. The higher the STC rating the more noise is blocked from transmitting through a wall or material. The decibel reduction of a wall that has an STC rating of 50 depends on the frequency of the sound. At a high frequency [baby crying, church bells] there may be a reduction between 40 – 50 dB while at a low frequency [bass drum] there may be a reduction of 10 – 15 dB. 

How does ROXUL compare to the competition in terms of sound attenuation?

Looking at a perfectly insulated structure which would affect mid-high frequency sound, when compared to fibre glass, ROXUL insulation provides a difference of 3 – 7 dB. However, differences in the installation between products can make an impact on the sound attenuation. 

Core Solutions (OEM)

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Get in touch for technical and customer support, media requests or to find your nearest ROXUL expert.
Get in touch for technical and customer support, media requests or to find your nearest ROXUL expert.
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