This is where game-changing building begins

Join now
R‑Class login
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 great pride in their craft and are always looking to learn about better materials and installation techniques that will ensure their homes are comfortable, beautiful, efficient and built to last. When you join the R‑Class, you’ll receive support and training by 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.

R-CLASS BUILDER BENEFITS

Membership benefits that are in a class of their own

When you join the ROCKWOOL R‑Class Builder Program, we’ll help you expand your building science knowledge, broaden your network, grow your business and earn money back from product rebates and incentives. Receive premium access to ROCKWOOL builder support on products and technical questions and even schedule jobsite visits. Get additional perks including access to our live R‑Class building science webinars and exclusive welcome kit.

R-class community

Connect with our high-performance building community on our virtual R‑Class platforms and at in-person events in your region.

See benefits

Products

Discover what we’re made of that makes all the difference in high-performance insulation.

See benefits

Support

Receive premium access to ROCKWOOL builder support on products and technical questions and even schedule jobsite visits.

See benefits

And Much More

Get additional perks including access to our live R‑Class building science webinars and exclusive welcome kit.

See benefits

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 & 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

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

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

Circularity

Is 100% recyclable

Contains up to 50% recycled content

Last more than 50 years

Can be manufactured from secondary materials

Meet the R‑Class

Connect with our high-performance building community

Matt Risinger

Risinger Build – Texas, US
Climate Zones 1–2
General contractor Matt Risinger is one of the highest-profile custom builders in the US — and he’s earned it. An expert in building science and high-performance homebuilding, Matt and his team have been a driving force in elevating the standards of the building industry by educating builders through The Build Show Network, live events and multiple digital platforms including YouTube and Instagram.

Jeff Harvey

Harvey Homes & Interiors – Ontario, Canada
Climate Zones 5–6
Toronto carpenter and custom homebuilder Jeff Harvey leads one of the city’s best custom framing crews. His company, Harvey Homes & Interiors, focuses on a transparent building process, quality craftsmanship and developing highly skilled tradespeople. Named “One to Watch” by BUILD magazine, Harvey Homes & Interiors has been featured on HGTV’s Property Brothers and Forever Home.

Jason Mollak

JPM Construction – Nebraska, US
Climate Zone 5
Jason Mollak, owner of JPM construction based in Omaha, Nebraska, is currently acting as general contractor on his fourth custom home build. Jason started as a carpenter at 18 and moved into remodeling and additions, honing his skills as a finish carpenter. His attention to detail in educating the homebuilding community is evident on his social media platforms. Keep up with Jason’s current build on the Fine Homebuilding House 2021 Nebraska.

Randy Williams

Willcon – Minnesota, US
Climate Zones 6–7
An energy auditor who comes from a family of builders, Randy Williams has shared his expertise as a contributing writer for Fine Homebuilding magazine and as a consultant for power companies and the building community through the Midwest Building Symposium. Randy primarily works with homeowners and fellow builders on existing homes, conducting energy audits and blower door tests. Randy shares his insight each month as a part of the ROCKWOOL R‑Class Webinar series.

Travis Brungardt & Joe Cook

Catalyst Construction – Kansas, US
Climate Zone 4
Based out of Prarie Village, Kansas, Travis Brungardt and Joe Cook are well-known in the high-performance building community. They take every detail of the build into consideration, carefully managing resources to minimize the impact on the environment. Their passion for sharing what they’ve learned with other builders led them to co-found the Kansas City BS + Beer group and the Midwest Building Symposium. You can also catch these two each month on the ROCKWOOL R‑Class Webinar series.

2021 Fine Homebuilding House – Nebraska

Our thermal and acoustic stone wool insulation materials release the natural power of stone to provide fire resistance, water repellency and durability that sets the standard for high-performance building insulation everywhere.

Rockwool Comfortboard® 80

Rockwool Comfortbatt®

Rockwool Safe'n'Sound®

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, this batt features a unique flexible edge for an easy install.

Rockwool Comfortboard® 80

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

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, this batt features a unique flexible edge for an easy install.

Rockwool Comfortboard® 80

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

2021 Fine Homebuilding House - Nebraska
Jason Mollak, JPM Construction
Rendering by Design Level 4

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.

Join R‑Class
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

PREMIUM SUPPORT

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.

Sales

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.

Contact us

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.

Learn more

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.

Learn more