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This is where game-changing building begins

Enter our exclusive sweepstakes

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Time to enter our Won & Done sweepstakes is limited! Enter today for a chance to win ROCKWOOL stone wool.

Jason Mollak, JPM Construction – Nebraska

About ROCKWOOL R‑Class

ROCKWOOL R‑Class is our premium partnership program for builders who demand more.

It’s a community for those who take pride in their craft. They use high-performance materials and installation techniques to ensure their homes are comfortable, beautiful, efficient and built to last. When you join the R‑Class, you’ll receive support and training from our team of residential building pros, samples, potential rebate savings and more. ROCKWOOL high-performance stone wool is in a class of its own — and so are the builders who make up the R‑Class.

Join the R‑Class

Join the R‑Class

The ROCKWOOL R‑Class Builder Program is 100% free. If you’re looking to level up to high-performance builds while building community, sign up today.

The 7 Strengths of Stone

There is something truly remarkable about the natural power of stone. Each of our high-performance products combines the 7 strengths of stone with one ambitious goal: to minimize the human impact on our surroundings while maximizing safety and well-being for anyone who interacts with our products.

Thanks to the unique durability and recyclability of ROCKWOOL products, we can help our customers create more resilient buildings and cities that ultimately enrich modern living.

01 Fire resilience

Fire resilience

Provides an excellent fire barrier for enhanced safety and protection

Will not burn, develop smoke toxicity or promote the spread of flames

Withstands temperatures above 2,150° F / 1,177° C

02 Thermal properties

Thermal properties

Engineered to provide an optimal indoor climate and reduce airflow and heat flow

Allows moisture to pass through walls for healthy indoor environments

Results in heating and cooling savings

03 Acoustic capability

Acoustic capability

Helps absorb sound and reduces noise transmission

Enables increased productivity in the workplace

Keeps your home quiet and comfortable

04 Water repellency

Water repellency

Does not absorb moisture

Repels water and allows vapor to pass through

Performs at its best even with moisture present

05 Durability


Lasts more than 50 years

Withstands fire, water, moisture and compression

Has no loss of performance over time

Resists mold and mildew

06 Aesthetics


Can be cut, bent or compressed without being damaged

Will carry the weight of a freight train

Is designed for individual applications to ensure the best performance

Fits in any space, preventing thermal bridges

07 Circularity


Is 100% recyclable

Contains up to 50% recycled content

Last more than 50 years

Can be manufactured from secondary materials

ROCKWOOL Stone Wool Insulation Applications

Our thermal and acoustic stone wool insulation materials release the natural power of stone to provide fire resistance, water repellence and durability that sets the standard for high-performance building insulation everywhere.
2021 Fine Homebuilding House
Nebraska Jason Mollack, JPM Construction Inc.
Rendering by Design Level 4

Click on each product to learn where it’s used in the home.

  • ROCKWOOL Safe'n'Sound®

    Inside interior walls for added soundproofing and fire resilience, designed for a friction fit into the wall cavity.

    Between floors, sized for dimensional lumber and I-joist construction to reduce sound transmission and improve fire performance.

  • ROCKWOOL Comfortbatt®

    In attic and exterior wall assemblies to improve a home’s energy efficiency. Featuring a unique flexible edge for an easy install.

  • ROCKWOOL Comfortboard® 80

    On exterior walls and basements for increased thermal performance and fire resilience, this rigid board is used as continuous insulation.

We constantly use ROCKWOOL insulation inside the cavity and the rigid insulation outside. We stand behind the product; we enjoy using it. We specify ROCKWOOL for our benefit and the project’s benefit.
Nick Schiffer
NS Builders

Join the R‑Class

There’s no better time to take your builds to the high-performance level. Join the ROCKWOOL R‑Class Builder Program today.


At ROCKWOOL, we’re all about building your success. From product and installation basics to technical questions about code compliance and building science, our team of professionals offers premium support to the R‑Class.


You’ll find our ROCKWOOL sales team on the road at jobsites just like yours, training and connecting directly with R‑Class builders. Reach out to the ROCKWOOL sales pro in your region to set up an in-person or virtual meeting to learn more about your build and where to find our products.

Technical Services

Whether you’re new to ROCKWOOL stone wool and just have some basic questions or need a deeper dive into details that drive the performance of your builds, our technical service reps are here to become a new valued member of your team. Reach our experts by phone or email five days a week.

Building Science

Whether you need help with code compliance evaluations, dew point calculations or energy modeling, this team of building science experts is next-level. ROCKWOOL Building Science works with our more advanced builders to perfect the thermal efficiency and resiliency of each building design, reaching far beyond insulation.