Reflective Attic Insulation R Value

Energy saving residential applications include.

Reflective attic insulation r value.

2 inch x 6 inch walls can use r 19 or r 21 products. Air space equals r value if you don t provide air space this product provides almost no insulating value. Recycled glass or sand that s melted and spun into fibers. If you install 2 layers of a reflective insulation does the r value double.

An easy to install double reflective double bubble insulation. As such a radiant barrier has no inherent r value. You can achieve better thermal performance in your attic by adding an additional layer of insulation. 2 inch x 4 inch walls can hold r 13 or r 15 batts.

Radiant barriers reflect radiant heat. Both conductive and radiant heat are trying to enter your home on a hot summer day or leave on a winter day when you are running the heat inside. This works to slow conductive heat. With multiple layers of product and airspaces between each layer enhanced performance will be gained.

A higher r value product takes longer to absorb 100 of it s potential and therefore is more effective at delaying the transfer of heat. But for the homeowner who already has r 30 to r 38 insulation in the attic it won t help much. If the product is simply doubled with no air space between the layers a very minimal benefit is obtained r 1 1 per layer for the reflective double bubble product. Traditional attic insulation has r value.

Most estimates for installing radiant barriers reach in the thousands of dollars. R values range from r 3 7 to r 21 depending on the applications. Basically a product with a higher r value is better than a simliar product with a lower r value. The higher the r value the better the thermal performance of the insulation.

R values themselves don t mean much alone unless they are used to compare the effectiveness of different r. Cathedral ceiling crawl space radiant floor wall hvac duct water pipe garage door knee wall r 21. Although it is possible to calculate an r value for a specific radiant barrier or reflective insulation installation the effectiveness of these systems lies in their ability to reduce heat gain by reflecting heat away from the living space. Achieving greater r values in exterior walls.