Radiant Barrier Roofing Felt

Because a radiant barrier needs an air space on at least one side installing it directly below felt and shingles will not allow the radiant barrier to block any radiant heat.

Radiant barrier roofing felt.

Hello experts my experience in roofing is 0 if 100 is not possible recently we had some hail storm i need to replace my roof. This is one example why we cook with aluminum cookware. You are getting a new roof so why not scrape off the shingles put down roofing felt then radiant barrier. Radiant barrier under shingles scams bad information at first it sounds reasonable.

A radiant barrier reduces the radiant heat transfer from the underside of the roof to the other surfaces in the attic. I m not sure why you would use a 50lb felt with radiant barrier attached unless you were installing under a metal or tile roof. Here is how to install radiant barrier in metal and tile roofing products. A radiant barrier works best when it is perpendicular to the radiant energy striking it.

Aluminum is a unique element it is both reflective and very conductive. For example if you install a radiant barrier on top of roof decking between the felt paper and asphalt shingles it will not provide any benefits as the radiant heat would be transferred through the shingles through the felt to the radiant barrier and through the roof decking into the attic space see image below. The foil or radiant barrier is useless unless you have an airspace on one side of the foil. Instead the heat from the shingles and felt will conduct all the way through the barrier into the attic and eventually in the living spaces.

It conducts heat very well which is good for cooking but not so good for living spaces.