Attic Duct Insulation R Value

R 8 inside thermal envelope.

Attic duct insulation r value.

When determining how much insulation you need don t guesstimate calculate. 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. N a all other ducts. The higher the r value the greater the insulation performance.

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. 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 value of r 6 is required for exterior ductwork or ducts installed in a ventilated attic or an unvented attic above a vented ceiling. R 6 and r 4 2 are common r values for ducts.

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

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. Here s how that 3 500 sf house would come out with those. Existing 3 4 inches of insulation. Know exactly how much you need with our project calculators.

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. Recommended insulation levels for retrofitting existing wood framed buildings. 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 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.

With multiple layers of product and airspaces between each layer enhanced performance will be gained. 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. R 10 at 2 ft. How often do you think you get the full labeled r value.

For most applications a rating of r 6 or better will provide the best efficiency and long term cost effectiveness. Add insulation to attic. R 6 supply in attic. The duct insulation r values i mentioned above are what s on the product label.

R value measures how well certain building insulation materials can resist heat.