Core Insulation Supply ReviewsSee store reviews

The acoustic performance is excellent. We installed it in our home office and it blocks out most of the household noise. Would definitely recommend.

This insulation really performs. We added it between rooms, and now we barely hear the TV from the next room. Plus, its fire resistance makes it a smart choice.

Used in my crawlspace. ROCKWOOL Comfortbatt® gave me peace of mind with its fire resistance and mold-proof qualities.

Comfortboard® is my go-to for sustainable builds. It’s made from stone wool and works across a range of applications.

ROCKWOOL Comfortboard® gave our new home exterior walls excellent insulation. It’s dense and solid—feels like it’ll last forever.

I installed Comfortboard® on my basement walls and it made a noticeable difference. It's rigid, easy to cut, and keeps moisture out. Great for below-grade applications!

The stone wool really holds up to moisture and pests. Great for exterior continuous insulation. Love the peace of mind.

This product made my pitched roof insulation simple. It has a rigid texture but is easy to work with and cut.

Really happy with this insulation. We used it for both below-grade and roof areas. Top-tier thermal and sound control.

Great insulation for slab-on-grade builds. Holds form under pressure and doesn’t degrade like other materials I’ve used in the past.

I’m very impressed with how ROCKWOOL Comfortboard® handles moisture. No signs of mold or damage even after heavy rain.

ROCKWOOL Comfortboard® is incredibly durable and easy to install. It fits perfectly for my basement walls and helped keep my home warm during winter.

Used it for below-grade foundation insulation. Super impressed with the rigidity and thermal performance. Would recommend to professionals and DIYers alike.

The fiber structure from rock materials really helps with insulation and soundproofing. I used it in my home theater. No regrets!

I’m all for sustainable materials, and Rockwool delivers. Basalt rock and recycled slag are clever choices. Keeps the house quiet and warm.

Great insulation product! It keeps our house warm in the winter and cool in the summer. The quality is evident.

This product is exactly what my renovation needed. It's dense and performs well. Love that it’s made from volcanic rock—feels super solid.

The product density and fire resistance of Comfortbatt are clear advantages. Installation was smooth, and I’m confident this insulation will perform well for years to come.

The quality and density of ROCKWOOL ComfortBatt are impressive. It helps regulate temperature indoors and feels durable. The flexible edge is a smart design element that made installation easier.

We used this product for our home renovation, and I couldn’t be happier. The insulation fits perfectly and works great for thermal performance. Knowing it’s fire resistant is reassuring.

I installed this insulation myself, and it was manageable even for a beginner. It’s dense, provides excellent thermal protection, and the fire resistance is a reassuring feature.

The combination of basalt and recycled slag fibers in Rockwool insulation makes it a durable, fire-resistant, and eco-friendly choice for any home insulation project.

Rockwool uses basalt rock and recycled slag to create a robust, fire-resistant insulation. It’s denser than traditional fiberglass and provides excellent soundproofing.

I recommend Rockwool for anyone looking for mineral fiber insulation. The volcanic basalt and recycled slag mix is innovative, and the product is non-combustible, giving excellent fire protection.

Using basalt rock and slag makes this insulation unique and environmentally responsible. It offers excellent fire resistance and thermal protection, helping my house stay comfortable year-round.

The density and composition of this batt make it a great choice for energy savings. I installed it myself without any trouble and saw immediate benefits.

If you want effective insulation that’s easy to install, this is it. The stonewool density prevents gaps and energy loss well. I’m very satisfied with my purchase.

I recommend Rockwool ComfortBatt to anyone who wants a reliable, easy-to-install batt. It’s thick but not overly difficult to handle, and it really works

The ComfortBatt R30 has improved my home’s climate control noticeably. It’s dense enough to prevent gaps, and cutting it to size was hassle-free. Definitely worth it.

Installing the Rockwool ComfortBatt was simple, and I appreciate how it doesn’t compress easily. The thermal efficiency is excellent — my energy bills are much lower this season.

ROCKWOOL Safe'n'Sound is durable, effective, and environmentally friendly. It’s a must-have for any renovation focused on safety and comfort.

I used this insulation in my basement walls and noticed reduced noise from the street. It’s also great for fire safety.

I feel much safer in my home thanks to the fire resistance of Safe'n'Sound. It’s a reliable and eco-friendly product.

This stone wool insulation was easy to handle and fit snugly in my walls. The acoustics in my home improved dramatically.

This insulation board is dense yet easy to cut. It has excellent moisture control, which is critical for our climate.

We used Comfortboard 110 for our basement walls. It’s solid, effective, and noticeably reduced moisture problems. Highly recommend for exterior insulation.

Works great! Love that it was free!

Great product

Easiest purchase for insulation I can imagine. Far Easier and cheaper than the big box stores

Great product and service!