Attic Duct Insulation R Value

Recommended insulation levels for retrofitting existing wood framed buildings.

Attic duct insulation r value. For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness. Some other factors to consider. 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. R 6 and r 4 2 are common r values for ducts.

Value r 10 continuous or r 13 cavity r15 continuous or r 19 cavity slab r value and depth ft r 10 at 2 ft. R value measures how well certain building insulation materials can resist heat. The duct insulation r values i mentioned above are what s on the product label. Add insulation to attic.

Existing 3 4 inches of insulation. Crawl space wall r value r 10 continuous or r 13 cavity 15 continuous or r 19 cavity duct r value supply in attic. R value of 3 5 is required for buried ductwork and ducts installed in an unvented attic with roof insulation or in an unconditioned space including both ventilated and unventilated crawlspaces. Know exactly how much you need with our project calculators.

Here s how that 3 500 sf house would come out with those. R 6 supply in attic. R value of r 6 is required for exterior ductwork or ducts installed in a ventilated attic or an unvented attic above a vented ceiling. Microlite fsk duct wrap comes with an fsk foil scrim kraft facing designed to help ensure a closed system that prevents moisture drive and offers condensation control.

The higher the r value the greater the insulation performance. N a all other ducts. R 8 inside thermal envelope. R 10 at 2 ft.

Purchasing the ducting and the insulation separately is often more cost effective and has a greater variety of options when it comes time to choose the r value of your insulation. 7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load. 6 305 btu hour 0 53 ton r 4 2 duct insulation. With multiple layers of product and airspaces between each layer enhanced performance will be gained.

Table 1 shows effective r values for 8 inch round ducts at three attic insulation levels and three duct insulation levels r 4 2 r 6 and r 8. When determining how much insulation you need don t guesstimate calculate. The effective r value of a buried duct installation depends on the size of the ducts the r value of the duct insulation and the depth of the loose fill insulation. How often do you think you get the full labeled r value.

If you install 2 layers of a reflective insulation does the r value double.