Reflective Attic Insulation R Value

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.

Reflective attic insulation r value. 2 inch x 6 inch walls can use r 19 or r 21 products. But for the homeowner who already has r 30 to r 38 insulation in the attic it won t help much. If you install 2 layers of a reflective insulation does the r value double. You can achieve better thermal performance in your attic by adding an additional layer of insulation.

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. Radiant barriers reflect radiant heat. Achieving greater r values in exterior walls. 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.

As such a radiant barrier has no inherent r value. With multiple layers of product and airspaces between each layer enhanced performance will be gained. Most estimates for installing radiant barriers reach in the thousands of dollars. This works to slow conductive heat.

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. Reflectix s stated r 14 r values for exterior walls are good only if the reflectix is paired up with r 13 fiberglass batt insulation. R values range from r 3 7 to r 21 depending on the applications. Lighter in weight than cellulose or mineral wool but it settles more than those materials so you ve got to put in a thicker layer to get the protection you need.

Cathedral ceiling crawl space radiant floor wall hvac duct water pipe garage door knee wall r 21. The higher the r value the better the thermal performance of the insulation. Basically a product with a higher r value is better than a simliar product with a lower r value. 2 inch x 4 inch walls can hold r 13 or r 15 batts.

Traditional attic insulation has r value. Batts and rolls are available in widths suited to standard spacing of wall studs attic trusses or rafters and floor joists. Air space equals r value if you don t provide air space this product provides almost no insulating value. Energy saving residential applications include.