Reflective Attic Insulation R Value

This works to slow conductive heat.

Reflective attic insulation r value.

Batts and rolls are available in widths suited to standard spacing of wall studs attic trusses or rafters and floor joists. Basically a product with a higher r value is better than a simliar product with a lower r value. Energy saving residential applications include. Most estimates for installing radiant barriers reach in the thousands of dollars.

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. R values themselves don t mean much alone unless they are used to compare the effectiveness of different r. An easy to install double reflective double bubble insulation.

Recycled glass or sand that s melted and spun into fibers. But for the homeowner who already has r 30 to r 38 insulation in the attic it won t help much. Achieving greater r values in exterior walls. 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.

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. Air space equals r value if you don t provide air space this product provides almost no insulating value. 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. As such a radiant barrier has no inherent r value.

2 inch x 6 inch walls can use r 19 or r 21 products. 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. The higher the r value the better the thermal performance of the insulation.

If you install 2 layers of a reflective insulation does the r value double. Radiant barriers reflect radiant heat. With multiple layers of product and airspaces between each layer enhanced performance will be gained. 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.