It checks today's price at every store, compares the alternatives and answers in about a minute.
This is a single fiberglass batt, 24 by 28 inches, rated R38 for high-resistance thermal performance in ceilings and tight attic spaces. It is formaldehyde-free and carries Asthma & Allergy Friendly and Verified Healthier Air certifications, which no other fiberglass insulation line holds. The 24-inch width suits wider joist spacing than standard 16-inch batts, so fewer pieces cover the same area. Owners rate it highly for easy cutting, low dust and quick recovery from the pack.
In stockSold by Supply the HomeReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Buyers rate it 4.9 out of 5 and mostly praise handling: it cuts cleanly, springs back after unpacking and leaves little dust. The allergy and air-quality certifications come up as a reason to choose it over ordinary fiberglass.
This is a fiberglass insulation batt in the Knauf line, sold under the Guardian Building Products name. It acts as a thermal barrier in both hot and cold climates, which can lower energy use and bills. It also provides acoustical insulation and helps make a home or commercial structure more comfortable indoors.
Knauf Performance+ products are Asthma & Allergy Friendly Certified and Verified Healthier Air. The certification program was established by the AAFA and Allergy Standards Limited (ASL). It involves physical and chemical testing to confirm that products reduce allergen exposure and limit indoor pollutants.
Knauf's residential Performance+ insulation has a formaldehyde-free binder. It leaves extremely low dust levels after installation. It also has extremely low VOC emissions at 24 hours and at 14 days after installation.





