When to Use Rock Wool Board？

ROCKWOOL Comfortboard® 80 is a rigid stone wool insulation board designed for use as an exterior continuous insulation in residential and commercial construction.

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Comfortboard 80 does not produce smoke or propagate flames, providing a critical line of defense that keeps occupants safe and reduces property damage in the event of a fire.

This stone wool product has been certified by the California State Fire Marshall's Building Materials Listing Program (BML). Vapor permeable, Comfortboard 80 has the added benefit of allowing fast outward drying. The insulation also reduces thermal loss resulting in improved long-term thermal performance.

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Properties:

• Can be easily cut with a bread knife
• Non-combustible with a melting point of approximately °C  (°F)
• Excellent sound absorbency
• Vapor permeable
• Does not rot or promote the growth of fungi or mildew 
• Low moisture sorption
• Chemically inert; non-corrosive
• Water-repellent
• CFC- and HCFC-free product and process
• Made from natural & recycled materials
• ROCKWOOL® can contribute to earning LEED® points

Here, we cover the major benefits of Rockwool, its shortcomings, and what other options are available to insulate your walls in your home or commercial project.

Benefits of Rockwool Board

Rockwool has a number of things going for it. Here are some of the benefits of choosing Rockwool Comfortboard 80 to insulate your project:

• Made from natural and recycled raw materials

• Excellent fire resistance with no smoke production or flame spread

• Termite and insect resistant

• High compressive strength

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• Provides acoustic sound absorption

Where to Use Rockwool Comfortboard 80

Rockwool Comfortboard 80 is designed for use on the exterior side of the wall for continuous insulation. It&#;s installed with 3-inch washers and nails, and is attached to sheathing over a vapor barrier or house wrap. Other applications can include foundation walls and under concrete slabs.

Disadvantages of Rockwool Insulation

Rockwool is a great option for some projects, however this type of insulation isn&#;t always the best for every application. Some of the shortcomings of Rockwool Comfortboard include:

Weight

It&#;s heavy, at over 50 lbs. per 4&#; x 8&#; board at 2&#; thickness, which makes installation laborious.

R-Value

At R4.2 per inch, Rockwool Comfortboard 80 is a middle-of-the-road option when it comes to thermal R-value performance.

Cost and Availability

Rockwool Comfortboard 80 can be difficult for homeowners to obtain because it is not typically stocked in big box stores, so it can be a challenge to obtain, and pricier to purchase.

An Alternative to Rockwool

Luckily, there is an alternative to Rockwool Comfortboard 80. Polyiso is a comparable option to Rockwool when it comes to installing insulation on walls. Taking it a step further, polyiso outperforms Rockwool when it comes to installability, thermal performance, and price point. If you&#;re looking for a less expensive, lightweight alternative to Rockwool&#;without sacrificing on performance, consider polyiso.

Easier Installation

Polyiso can be installed in the same locations and applications as Rockwool as a continuous insulation, but with significantly less weight bearing on your installers and your walls. Since polyiso is made out of foam, it&#;s inherently lightweight and can be carried and maneuvered easily by a single installer without suffering from the fatigue of lifting heavy Rockwool boards, which may require two installers per board, or smaller board sizes.

R-Value Thermal Performance

It&#;s hard to beat the thermal performance of polyiso. At R6 per inch, it&#;s one of the best thermal insulation options for walls. With polyiso products like Rmax Durasheath® building envelope insulation, you can achieve an R21.8 with just 3-½&#; thickness, whereas achieving this same R-value with Rockwool Comfortboard 80 requires over 5&#; thickness.

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