Radiant Barrier Roofing Felt

Radiant barrier under shingles scams bad information at first it sounds reasonable.

Radiant barrier roofing felt.

It conducts heat very well which is good for cooking but not so good for living spaces. This is one example why we cook with aluminum cookware. The hot roof material then radiates its gained heat energy onto the cooler attic surfaces including the air ducts and the attic floor. 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.

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. A radiant barrier reduces the radiant heat transfer from the underside of the roof to the other surfaces in the attic. A radiant barrier works best when it is perpendicular to the radiant energy striking it. If you take radiant barrier foil and sandwich it between the shingles and roof felt you have now created one solid assembly.

Aluminum is a unique element it is both reflective and very conductive. One roofer offered me to install polaralum as radient barrier over the deck for a aditional cost of 1600 and according to the roofer i can get the energy tax credit. The foil or radiant barrier is useless unless you have an airspace on one side of the foil. Here is how to install radiant barrier in metal and tile roofing products.

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.