Foam board insulation types.
Mylar insulation r value.
There are three basic foam insulation board products on the.
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.
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.
R value is a term to describe how quickly heat will pass through or be absorbed by a product.
The rubber meets the road on reflectix s website where it says no air space no reflective insulation benefit.
What is the r value or r rating of radiant barrier foil insulation.
Reflectix can provide verification for all r values stated for all products and applications.
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 about r values for a reflective insulation and why do they vary with application.
Some products say r4 r6 or r8.
See also material data sheet msds 1511 or msds 1911.
The information on this page is based on data considered to be true and accurate based on periodic internal.
The down r value.
If you don t provide air space this product provides almost no insulating value.
A tennessee valley authority study based on radiant barriers used in the summer found that.
In summary you increase the r value of your existing insulation by installing a radiant barrier foil insulation product.
1 when joints penetrations detailed appropriately.
This testing to designate an r value only applies to conductive heat flow not radiant heat flow.
An r 1 1 is provided from the product itself for the reflective double bubble material.
Conductive heat will only pass through a solid object or several objects that are.
Air space equals r value.
The reason it is sometimes called the summer r value is because in summer you want to keep the heat out.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Notes to the table above.
R values for reflective insulations are dependent.
2 stated thermal resistance values are based upon conditioning requirements and test methodology found in astm c1289 and astm c518 for foil faced polyisocyanurate insulation.
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.
Notes on the r value k values of different forms of asbestos.
Studies have found the following about radiant barriers to be true.
