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.

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

Recycled glass or sand that s melted and spun into fibers. Traditional attic insulation has r value. 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.

Most estimates for installing radiant barriers reach in the thousands of dollars. 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. This works to slow conductive heat. With multiple layers of product and airspaces between each layer enhanced performance will be gained.

Basically a product with a higher r value is better than a simliar product with a lower r value. If you install 2 layers of a reflective insulation does the r value double. R values range from r 3 7 to r 21 depending on the applications. 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.

2 inch x 4 inch walls can hold r 13 or r 15 batts. 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. Radiant barriers reflect radiant heat.

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. Energy saving residential applications include. Achieving greater r values in exterior walls. But for the homeowner who already has r 30 to r 38 insulation in the attic it won t help much.