Frequently Asked Questions

What is the reflectivity?

RoofingFoil™ reflects 97% of radiant heat.

What is the foil made of?

RoofingFoil™ is 99% pure aluminum foil with an inner woven polyethylene scrim. It will not rip or tear – it’s tough!

Can I get a sample of the foil?

Yes, we mail out free samples of our radiant barrier foil. Fill out the information on this page to request your sample: Free Radiant Barrier Sample.

Is there a top or bottom? Are both sides the same?

For the double-sided products, both sides are the same.
For the single-sided products, the foil side faces the air space/gap.

Can I install radiant barrier between my shingles and my roof deck?

No! This will not work; radiant barrier must have an air space in order to block heat. If you sandwich the foil between the decking and the shingles, there is no air gap and the foil doesn’t help you.

Will the foil affect my cell phone reception?

Typically a modern-day cell phone won’t be effected by radiant barrier foil. Also, radio waves travel in all directions and, with the ever expanding network of cell towers, foil on your roof contributes very little, if at all, to interrupted service.

Is RoofingFoil™ fire rated?

Yes, it has a Class A/Class 1 Fire Rating.

Please Note: Class A/Class 1 does not mean the radiant barrier is fireproof; under the right conditions (ie. open flame on an exposed corner) the product can burn.

Can this be placed directly under shingles?

No, radiant barrier foil must have an air space on at least one side in order for it to work. In the case of a shingled roof, the foil would be sandwiched between asphalt shingles and the roofing deck/underlayment. In this set up, there is no air space, so the aluminum radiant barrier layer will not be effective in any way.

The only way to make this work is to have an air space (ie. a double-deck system or installed below the decking, draped between the rafter cavities).

What is the warranty on RoofingFoil™?

We offer a 25 year limited warranty against failure or defects in our products. To see the complete manufacturers warranty, please click here.

Can I put foam board on top of the RoofingFoil™ before the metal?

No, the RoofingFoil™ must face an air gap/space in order to work properly. If the air gap is not there, the product will not work. More info here: Why is an air space required?

What is the minimum required air gap/space for this product to work?

The foil side of the RoofingFoil™ must face an empty air gap/space of at least 1/2″. This is the bare minimum that we’ve seen work, although we like to encourage people to aim for a 3/4″ gap as the minimum to ensure the foil is able to work properly.

This air gap must be a true air space – nothing can be touching that foil side except air. No insulation, no vapor barrier, no foam, etc. For more info on why this has to be an air space for the product to work, watch this video about the required air gap for radiant barriers.