It checks today's price at every store, compares the alternatives and answers in about a minute.
Reflectix R21 is a radiant barrier made of two layers of air bubbles bonded between metalized aluminum film. It reflects about 97% of radiant heat and is fire rated Class 1/Class A per ASTM E84. It is fiber-free, so it installs without the itch and protective gear fiberglass needs, and it resists moisture, mold and pests. It works best as a radiant barrier in attics, walls and crawl spaces, not as a substitute for bulk insulation that slows conductive heat loss.
In stockSold by JTO Upstart NoveltiesReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Owners use it mostly for attic rafters, garage doors and crawl spaces and like the clean, itch-free install. Many note it helps with radiant heat but does not replace bulk insulation.
This is a reflective bubble roll insulation for attic walls. It is built from two layers of polyethylene air bubbles bonded between two layers of highly reflective metalized aluminum polyester film. The material is lightweight and durable, and it holds staples without tearing. It does not compress, collapse or disintegrate.
The insulation reflects 97% of radiant heat and emits less than 3%. It is a Class 1 / Class A fire rated radiant barrier that has passed the ASTM E84 and ASTM E2599 tests. It is not affected by moisture or humidity, inhibits condensation, and does not promote the growth of fungi, mold or mildew. It also does not promote nesting of insects or rodents.
It is non-toxic, non-carcinogenic and fiber-free, so installing it does not require protective clothing or respirators. It cuts with a utility knife or scissors and can be stapled, nailed or glued into place. It is maintenance free. By reducing stress on heating and cooling systems, it helps keep a home warmer in winter and cooler in summer.







