Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers overwhelmingly praise this insulation knife for its exceptional cutting performance through rockwool, fiberglass, and foam with minimal effort, delivering smooth, precise, square cuts that transform a tedious task into a manageable one. Reviewers consistently highlight the durable, razor-sharp blade that maintains its edge through extended use, paired with a comfortable, lightweight, non-slip handle that reduces hand fatigue and prevents blisters. Many appreciate the high value for the low price point, calling it a must-have for insulation work. A few note the handle could be larger for bigger hands or mention limitations with thicker foam, but these minor concerns are vastly outweighed by overwhelming satisfaction.
Customer review summary generated by AI, including incentivized reviews.Owens Corning R30 Unfaced is the best!
Would RecommendAbsolutely the best insulation you can buy. Had to reinsulate my entire attic 40x40! The blown in insulation had deteriorated and settled and I had to use the R30 to install over it. It was a tough job, bought 55 rolls and took two weekends but the results were instant. You will definitely need to the insulation knife to cut the R30 as it is thick. The knife was a necessity and couldn’t do it without it. Make sure you use a mask and and insulation suit also. My central air ran non stop and would...
Verified Purchaser
Must have
Would RecommendThis is a must have tool if dealing with rock wool. Cuts greats and makes it easy to handle.
Verified Purchaser
Cuts through insulation like butter!
Would RecommendThis knife worked great! We were installing Rockwool and this cut through it like cutting bread! It was smooth and easy.
Verified Purchaser
Grip-Rite for Cutting Stone Wool Batt Insulation
Would RecommendThis knife was purchased to cut Rockwool ComfortBatt insulation and did its job well. However, a cheaper alternative would do just as well (i.e., large cheap serrated knife). The best characteristic about this knife was the comfortable plastic handle and the fact the handle was red making it easier to locate when you lay it down.
Verified Purchaser
Makes it simple
Would RecommendI used this for cutting rockwool Works like a champ.
Verified Purchaser
Get more than 1 if you have a lot to cut
Would RecommendOther than the impression that it became duller over time, this worked great on RockWool. I bought 2 while working with 144 batts and should have probably gone for 3. I am sure they can be sharpened but who wants to stop and sharpen a knife when you are on a roll?
Verified PurchaserVerified Pro
Sharp
Would RecommendIt worked well. For my 1700 sq feet it worked as needed. I used it as well for cutting excess fire foam that would have been in the way of drywall.
Verified PurchaserSweepstakes
Good Value
Would RecommendThis knife did its job. It was a very good value. It cut through the insulation. I was able to use it without much of a problem. I would recommend this to any do-it-yourselfer.
Verified PurchaserSweepstakes
Insulation knife
Would RecommendWorks excellent for cutting insulation down to size. Much better than hacking through it with a utility knife.
Verified PurchaserSweepstakes
Worked for cutting insulation
Would RecommendI used this to cut rock wool insulation batts. It worked much better than a regular utility knife.
Verified PurchaserSweepstakes
Very Nice item, and Sharp
Would Recommendused it to cut my insulation,very sharpe and easy to use!!
Verified PurchaserSweepstakes