Attic Duct Insulation R Value

For contractors looking for r 12 duct warp microlite fsk formaldehyde free duct wrap is the only duct wrap on the market with an installed r value of r 12 in a single layer.

Attic duct insulation r value.

The higher the r value the greater the insulation performance. 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. Some other factors to consider. 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.

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. Recommended insulation levels for retrofitting existing wood framed buildings. Know exactly how much you need with our project calculators. For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness.

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. Crawl space wall r value r 10 continuous or r 13 cavity 15 continuous or r 19 cavity duct r value supply in attic. 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. R value measures how well certain building insulation materials can resist heat.

N a all other ducts. Here s how that 3 500 sf house would come out with those. 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. 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 8 inside thermal envelope. 7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load. Existing 3 4 inches of insulation. With multiple layers of product and airspaces between each layer enhanced performance will be gained.

R 6 and r 4 2 are common r values for ducts. How often do you think you get the full labeled r value. R 10 at 2 ft. 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.

R 6 supply in attic. When determining how much insulation you need don t guesstimate calculate. If you install 2 layers of a reflective insulation does the r value double. R 6 duct insulation 6 305 btu hour 0 53 ton r 4 2 duct insulation 7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.

Add insulation to attic.