Ratings & Reviews for ROCKWOOL Comfortbatt R- 30.0 Attic Wall Unfaced Stone wool Batt Insulation 30-sq ft ( 23.0-in W x 47.0-in L )

You can't go wrong . . .

Unless you are trying not to insulate something. But, if you are - this is your stuff. And it comes in easy to handle 23"x47"x14" plastic wrapped package. Plus, it does not promote fungi or mildew! Who could ask for more?

Insulation 5 Stars, Delivery 2 Stars

I just finished installing this over the existing blown fiberglass (I only had around 4"-5" of blown insulation that was 20 years old). Installed perpendicular to the studs as suggested as to not mat down the blown insulation too much. The most difficult part was getting all the bags in the attic. I had to move my whole house fan to get a hole large enough to fit the bags. They measured about 21" x 24" x 47". I was also surprised at the weight of the batts over the fiberglass insulation, ea...

Best Insulation

Best insulation, not itchy, easy to cut, and well worth the extra cost. Make sure you have the right blade/knife to cut this insulation and the blade will dull quickly on big jobs.

Great Insulation

Dense packed. Easy to cut and install. Fit nicely and doing its job in our home.

warm and cozy

this insulation is so easy to cut and best of all you dont have that itch for days, no itch at all!!!!

Millions of tiny fibers hang in the air for weeks

Beware. I do NOT recommend this product. I put 4, just 4, of these batts in my attic. It has made a huge mess of the air quality. Several weeks later there are millions of these tiny fibers that still hang in the air. When I go up in the attic first of all I start to cough and it hurts my lungs. I noticed when I got back down from the attic that on my glasses there were hundreds of these tiny fibers 1/32" long or shorter, maybe 1/64". That is what was getting in my lungs and making me cou...

A great way to insulate

Rock wool is so much easier to install than fibreglass batts. Maintains its shape, and is easily cut with a bread knife leaving a flat edge.

Great for my Attic Renovation Project

I am in the process of making my attic into a bedroom and this was the first product that I looked at, and after doing my research on the products from other companies and chose this product for its value and for the quality of this product.

Easy To Install

I literally just installed this an hour ago. Very easy to hang in my crawlspace but due to some slightly uneven framing I tried to use hangers. This is way heavier than fiberglass insulation so the hangers didn't hold it. Ended up cutting the batts to the length I needed and putting them in that way in a few trouble areas. Supposed to be very cold tonight so I'll know if my investment paid off in my very drafty new kitchen soon.

why is fiberglass still even used?

Didn't know this type existed till I found it in my attic. Its about 50 years old and appears to have settled A LOT so we were looking to replace it. Thought it is was fiberglass till I read the vapor barrier. This stuff is way more superior to fiberglass! NO itchy skin from fiberglass fibers, highly fire resistant so less worry when used around recessed lighting fixtures, denser than fiberglass and not easily compressed when handling which can lower r value in fiberglass insulation, water res...

Easy soundproofing and insulation

I learned from a woman friend how to use this product for my shed to art studio conversion. It was easy to install, not itchy or messy, and I put it up myself. So much better than fiberglass, and because it soundproofs, excellent for a noisy rural neighborhood.

It Rocks!

We haven't had the product long enough to see a difference in our heating bill but it was MUCH easier to install than fiberglass. Rockwool was very easy to cut through to maneuver around wires and pipes with only a small amount of dust and mess. We highly recommend this product.

Good product

Overall a good insulation. Very good sound absorbing qualities. 24” construction was a little difficult to install into new construction ceiling. Did not want to stay in the rafters with friction alone. 16” Was not a problem. Wider stuff must just be to heavy. Little itchy when you have to cut it and work over head. Over all seams like really good insulation.

Rockwool Review

Great product to work with and has made a huge difference in retaining heat in our Florida room. Place this between the joists ofnthe deck the Florida room was built on top of. Only critique is that I had to by this in 23 inch width and then combine pieces. The 15inch width was no longer available in R30

Great insulation. Easy to cut and install without all the itching of fiberglass. Got 24” to cut in half to use in 12 “ center floor joists. Found very easy to cut using the 14 back cut hand saw, alot easier than using a knife.

Does what it says.

Had to redo an addition on my home, practically no insulation at all originally. Once this added, the room now doesn't lose cooling like it used to and it feels much better on the rare cold spell.