How thick is ductboard?

The 11/2” (38mm) and 2” (51mm) thickness provides superior thermal value. Mean temperature is the average of two temperatures: that of the air inside the duct and that of the ambient air outside it. Note: Specified design thickness should be adequate to prevent exterior surface condensation.

What is the R-value of 2 inch duct board?

8.7
Thermal Performance Thermal resistance (R-value) of 2″ fibrous glass duct board is 8.7, which enables it to comply with energy codes requiring duct system R-values of at least 8.0.

What are the most popular thickness for duct board?

Duct board is a pressed fiberglass sheet with a binder that is commonly used in heating and cooling systems. The sheets are typically available in three thicknesses (1″, 1.5″, or 2″) with R-values of either 4, 6, or 8 and the sheets have dimensions of 4′ x 8′, 4′ x 10′, or 8′ x 10′.

Can you use duct board on a furnace?

Standard uncoated fibrous glass duct board may be used after the first four feet of coated duct. For a horizontal supply system with a horizontal return, again, standard uncoated fibrous glass duct board may be used in the return adjacent to the furnace fan, as shown in Figure 4.

What R-value do I need for HVAC ductwork?

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). There are no R-value requirements for ductwork installed in an indirectly conditioned space.

What insulation is best for ductwork?

fiberglass insulation
When insulating HVAC ductwork, use a foil, faced fiberglass insulation with an R-6 or higher R-value. Use the type of metallic foil duct tape recommended by the insulation manufacturer to seal and hold the insulation in place.

What is the minimum R-value for ductwork?

“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.

Can duct board be used in commercial buildings?

Duct board is a semi-rigid fiberglass insulation material often used for residential or light commercial heating and cooling applications in lieu of metal duct.