Core Insulation Supply ReviewsSee store reviews

Installed it in my attic and I’m very pleased. My energy bill dropped slightly, and I feel the house retains heat better now.

Comfortbatt® works like a charm. It’s easy to cut and shape, and once in place, it stays put. Also great for soundproofing.

The best insulation if you want both sound and fire protection. Used it in a rental property and it’s a game-changer.

I installed Comfortbatt® in my attic and saw an immediate improvement in temperature control. Easy to cut and fit—no gaps, no fuss.

Noise control and thermal performance are both top-notch. It’s a bit heavier than other boards, but that’s because it’s built to last.

I installed it under a basement slab. Big difference in floor temperature after installation. No more cold toes in winter!

Used ROCKWOOL Comfortboard® for under my concrete slab. It performed well, preventing heat loss and making my floors warmer.

I’ve worked in construction for 12+ years, and this is among the best insulation boards I’ve used. Rigid, clean cuts, and no sag.

Great quality insulation. I used it above-grade on a home extension. Performs well in damp weather, and I felt the temperature control immediately.

Really solid insulation product. Rockwool feels more durable than other batts I’ve worked with. The volcanic rock composition makes sense for heat resistance.

Installed this in our garage studio. The soundproofing and thermal insulation are great. Plus, knowing it’s made from basalt makes it feel strong and safe.

I love that Rockwool uses volcanic rock and slag—it feels sustainable and strong. Installation was easy, and the thermal protection is amazing. It’s now my go-to insulation.

This insulation performs well in various applications, from walls to floors and attics. The dense stone wool material resists compression and moisture effectively.

I was surprised by how easy Comfortbatt was to work with during installation. It’s dense but flexible enough to fit well and provides great thermal protection.

Comfortbatt has good moisture resistance, which I needed for my basement walls. It installs neatly and provides consistent thermal insulation.

Installed this in my garage walls. The thermal and sound insulation is top-notch. I appreciate the use of basalt and recycled materials too.

Cutting and installing Rockwool was surprisingly simple. It fits well and stays in place. Excellent sound dampening as a bonus.

Rockwool ComfortBatt’s dense fibers provide excellent insulation without compressing easily. The flexible edge is handy for fitting in tight spaces. It’s been a great addition to our home.

I appreciate the sustainable materials in Rockwool insulation. The basalt rock and slag fibers deliver strong thermal and acoustic insulation without compromising fire safety.

I chose Rockwool because of its eco-conscious composition. The basalt and recycled slag fibers provide reliable insulation, and the product’s fire resistance is a major safety bonus.

Rockwool insulation has exceeded my expectations. The mineral fibers are dense yet flexible enough for easy installation. The fire resistance feature gave me peace of mind for my family.

The Rockwool ComfortBatt R30 is easy to install and offers great thermal efficiency. I’m happy with how much it helped reduce my home energy costs.

I’m impressed by how well this insulation performs. It’s thick, easy to cut, and fits perfectly to reduce heat loss and drafts in my home.

Easy to install and very effective insulation. The thermal efficiency has noticeably increased in my home since I replaced the old insulation with this ComfortBatt.

ComfortBatt R30 lived up to its claims. I installed it in my walls, and it cut down on drafts. It was easy to fit and helped reduce heating costs.

The product installs easily and fits well in tight spaces. I highly recommend Safe'n'Sound for both soundproofing and fire resistance.

As a contractor, I recommend Safe'n'Sound for its excellent fire resistance and noise control. It’s a solid choice for residential projects.

I installed this insulation in my new build and it exceeded expectations. Fire safety and soundproofing combined in one product.

ROCKWOOL Comfortboard® made a huge difference in our home’s insulation. Installation was straightforward, and the fire resistance gives me peace of mind.

I installed ROCKWOOL Safe’n’Sound in my home theater and the soundproofing is incredible. No more complaints from the rest of the house!

Happy with the product and delivery.

Prompt service, excellent price, customer service very responsive.

Product is just as expected. Delivery driver Jamal was amazing!

Great stuff easy to install.

Easy to cut and install. Shipping was professional.

I’m a contractor and always recommend Comfortbatt® to clients. It performs well and is easy to install even in tight spots.

The difference in noise is noticeable. If you want peace and quiet inside your home, this is the insulation to use.

ROCKWOOL Safe’n’Sound lives up to its name. It made our home theater soundproof and adds that extra layer of fire protection. Worth every penny.

Great product for interior walls. I used it between bedrooms and it made a noticeable difference in noise levels. Installation was a breeze.

Love the versatility. Used Comfortboard® in a few different parts of the house, and it worked well in all cases.