Attic Duct Insulation R Value

Duct insulation recommended r values by climate and duct location.

Attic duct insulation r value.

C403 2 9 duct and plenum insulation sealing 1 supply and return air ducts and plenums shall be insulated with a minimum of r 6 insulation where located in unconditioned spaces and where located outside the building with a minimum of r 8 insulation in climate zones 1 4 and a minimum of r 12 insulation in climate zones 5 8. Unheated basement or crawlspace. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 7 948 btu hour 0 66 ton the numbers are even higher for the additional heating load.

R value is a measure of insulation s ability to resist heat traveling through it. The table below shows what levels of insulation are cost effective for different climates and. Return ducts ductwork that brings expended air back to the hvac system to be filtered reconditioned and redistributed require insulation with an r value of 3 5 for exterior ducts and ducts in a ventilated attic or unvented attic above an insulated ceiling. Some other factors to consider.

Insulation level are specified by r value. Mixed moderate heating and cooling. How often do you think you get the full labeled r value. The duct insulation r values i mentioned above are what s on the product label.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. When insulating ducts understanding the meaning and impact of r values and insulation thicknesses is essential to getting the most efficient affordable outcome on your heating installation project the ratings provide a guide for homeowners that determines the effectiveness of the insulation making it easier to choose the right insulation for your home. The higher the r value the better the thermal performance of the insulation. Prescriptive attic options climate zone hvac duct insulation leakage radiant barrier r 30 at ceiling attic floor r 38 at ceiling attic floor fiberglass below roof deck between rafters air handler ducts in the attic option b 1 r 6 or r 8 depending on cz all with 5 leakage 2 3 5 7 10 16 r 13 4 8 9 11 15.

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. How often do you think you get the full labeled r value. Warm cooling and minimal heating. The duct insulation r values i mentioned above are what s on the product label.

Recommended home insulation r values. 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.