Core Insulation Supply ReviewsSee store reviews

Fantastic for foundation walls. Comfortboard® stays in place and provides a solid insulation layer that doesn’t degrade over time.

This board is a game-changer! We used it under the concrete slab, and the thermal performance is outstanding. No more cold floors.

Comfortboard is now part of all our new home builds. It’s code-compliant, safe, and high-performing in all weather types.

The board’s rigidity makes it ideal for large wall applications. Plus, it handles water and mold resistance better than foam boards.

I appreciate the versatility of this product. It’s perfect for pitched roof insulation and made a noticeable difference in my energy bills.

Comfortboard saved me time during a recent reno. Loved the fact it could be applied across multiple areas. Energy savings noticeable too.

I’ve used Comfortboard in pitched roof projects, and the results were top-notch. It's fire-resistant and easy to cut to fit tricky angles.

Rockwool Comfortboard is my go-to for insulating exterior walls. It’s tough, durable, and handles moisture extremely well. Excellent for long-term use.

Very durable and high-performance product. Feels industrial-grade but is perfect for homes. I’ll be using Rockwool again for sure.

Rockwool is impressive. It feels more substantial than fiberglass, and the origin story of molten basalt makes it sound as tough as it performs. 8.

Rockwool insulation is clearly engineered with purpose. Basalt and recycled slag? Genius. My attic stays much cooler now, even in peak summer.

I noticed a big difference in energy bills after using ROCKWOOL Comfortbatt. It provides strong insulation and sound reduction, which makes my home more comfortable.

This insulation is a solid choice for exterior wall cavities. The stone wool texture feels durable, and my home’s overall thermal comfort has improved significantly.

Comfortbatt has been fantastic in helping regulate temperature in my home. The material feels sturdy and fire-resistant, adding a layer of safety as well.

I installed ROCKWOOL Comfortbatt in my floors and walls. The product held its shape well and maintained insulation value even in tight spaces.

Comfortbatt is great for basements and crawlspaces. It resists moisture and molds better than my previous insulation, and it keeps my home warm and dry.

I appreciate that Comfortbatt works well in multiple applications—walls, floors, and attics. It’s a versatile product with great thermal properties and sound absorption.

Rockwool insulation was a great choice for our attic. It's durable, eco-friendly, and easy to work with. We noticed a difference in temperature control almost immediately.

I liked how quickly I could install Comfortbatt in my attic. It has a sturdy feel and fits tightly without gaps. I’ve noticed less heat loss since applying it.

The density of ROCKWOOL Comfortbatt stands out. It resists compression and stays in place well. My home’s heating and cooling efficiency improved noticeably after installation.

ROCKWOOL ComfortBatt exceeded my expectations. It installs easily, fits tight, and provides great thermal resistance. Plus, the fire-resistant feature is a huge bonus for peace of mind.

Rockwool insulation exceeded my expectations. The stone wool fibers made from natural and recycled materials ensure a high-quality, fire-resistant product that improves home comfort.

We replaced old insulation with ROCKWOOL ComfortBatt, and the improvement is night and day. The soundproofing is better too. Definitely recommend for anyone serious about energy savings and safety.

The basalt and slag fiber blend in Rockwool insulation offers excellent thermal protection and sound absorption. I feel secure knowing it also adds fire resistance.

I’m impressed with the thermal performance of this insulation. The product is thick but easy to cut and install. It’s made a clear difference in maintaining consistent indoor temperatures.

The mineral fiber composition of Rockwool insulation is a big advantage. It’s environmentally responsible and performs well for thermal and acoustic insulation.

Rockwool ComfortBatt is hands down one of the best batt insulations I’ve used. The quality stonewool makes it easy to install and very effective at controlling temperature.

The product was shipped quickly and arrived in perfect condition. Installation was simple, and the insulation performance is impressive — my home stays warm and cool as needed.

The density of this Rockwool batt makes it a superior choice compared to fiberglass. It’s easy to work with, and the thermal benefits are clear.

This insulation offers excellent value. It’s thick, dense, and easy to install. Since putting it in, my home feels much more comfortable, and energy costs have dropped.

I was surprised by how quickly the ComfortBatt improved my home’s insulation. The batt fits tightly, and I didn’t find any gaps afterward. Highly recommended!

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

fter installing this insulation, I noticed a big improvement in sound dampening between rooms. Also, it’s great knowing it’s non-toxic.

This product fits perfectly in wall cavities and noticeably reduces noise from neighboring rooms. Plus, it’s fire-resistant, which is a big plus.

I trust ROCKWOOL Comfortboard for its durability and resistance to fire and moisture. It’s a solid investment for any build.

The fire resistance rating was a deciding factor for me. Comfortboard lived up to its claims and was straightforward to work with.

As a contractor, I’ve used many insulation products. Comfortbatt stands out for its fire resistance and consistent performance. My go-to choice now.

I did not receive and still have NOT received my whole order. I received 11 bundles. I ordered 15. I have contacted you about this shortage and STILL do not have my complete order. I am not happy!

ROCKWOOL Comfortbatt® gave me peace of mind knowing my crawlspace was better protected. It's also moisture and fire resistant, which is a huge plus.

I used ROCKWOOL Comfortbatt® in my basement remodel, and it exceeded expectations. It's dense, fits snugly, and noticeably improved the temperature balance.