Mylar Insulation R Value

Some products say r4 r6 or r8.

Mylar insulation r value.

The down r value also known as the summer r value is a measurement of an insulation s ability to resist heat flow from coming into the house. A tennessee valley authority study based on radiant barriers used in the summer found that. The higher the r value the more resistant a material or building assemblage is to conductive heat transfer. R value is a term to describe how quickly heat will pass through or be absorbed by a product.

The reason it is sometimes called the summer r value is because in summer you want to keep the heat out. Because of this i often get questions about which type of foam board insulation to use and what r values these products provide. Notes on the r value k values of different forms of asbestos. What about r values for a reflective insulation and why do they vary with application.

Notes to the table above. This testing to designate an r value only applies to conductive heat flow not radiant heat flow. Foam board insulation types. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

1 when joints penetrations detailed appropriately. Reflectix can provide verification for all r values stated for all products and applications. Air space equals r value. Conductive heat will only pass through a solid object or several objects that are.

See also material data sheet msds 1511 or msds 1911. An r 1 1 is provided from the product itself for the reflective double bubble material. There are three basic foam insulation board products on the. R values for reflective insulations are dependent.

I ve written several posts about how to insulation basement walls in which i promote the use of foam board insulation as the first line of defense against moisture and mold. If you don t provide air space this product provides almost no insulating value. The rubber meets the road on reflectix s website where it says no air space no reflective insulation benefit. Insulation companies who make metallic bubble wrap or their distributors like to boast about their products attributes and often add the equivalent reflective r values to the conductive values giving an overall equivalent r value.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. What is the r value or r rating of radiant barrier foil insulation. The down r value. Studies have found the following about radiant barriers to be true.

The information on this page is based on data considered to be true and accurate based on periodic internal.