Air space equals r value.
Reflective attic insulation r value.
The overall r value of a wall or ceiling will be somewhat different from the r value of the insulation itself because heat flows more readily through studs joists and other building materials in a phenomenon known as thermal bridging.
Because of the presence of the small insulating layer a reflective insulation product by itself achieves a small r value typically around 1 0.
When determining how much insulation you need don t guesstimate calculate.
An r value is a measure of an insulation product s resistance to thermal heat transfer.
For example insulation that is compressed will not provide its full rated r value.
The rubber meets the road on reflectix s website where it says no air space no reflective insulation benefit.
A reflective insulation product is a thicker product with an insulating middle layer such as fiberglass foam or air bubbles.
R value measures how well certain building insulation materials can resist heat.
What about r values for a reflective insulation and why do they vary with application.
If you don t provide air space this product provides almost no insulating value.
The higher the r value the more resistant a material or building assemblage is to conductive heat transfer.
Most people are familiar with the term r value when discussing insulation properties.
Reflectix can provide verification for all r values stated for all products and applications.
The higher the r value the greater the insulation performance.
It s a measure of how long it takes a heat absorbing product to absorb 100 of its potential and begin to transfer that heat out the other side of the product.