Insulating Attic Heating Ducts

Typical ducts install between a plenum or large supply duct and.

Insulating attic heating ducts.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. The duct insulation should include a vapor barrier cover. But the air in the ducts is facing a delta t of maybe 100 f or 120 f a greater delta t. Purchase duct wrap insulation that complies with the 2009 international energy conservation code iecc standards that specify an r value of 8 for attic ducts and 6 for ducts located anywhere else.

Department of energy attic insulation improvements combined with air sealing and proper hvac maintenance can cut your heating and cooling energy use by 20 to 50. Don t use standard cloth duct tape on hvac ductwork since the adhesive won t hold up to extreme temperatures. According to the u s. When the attic is 20 f that insulation is addressing a delta t of 50 f.

Get free shipping on qualified insulation or buy online pick up in store today in the heating venting cooling department. Read this before you start thinking about adding insulation to your attic. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. Made from 1 to 2 inch thick sheets of rigid glass fiber and coated with an aluminum laminate for a moisture air barrier duct board comes in sections that fit together like metal ducts.

Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. Proper insulation is a great place to start but it may not be enough to fully protect your home. Duct board much like the duct liner is also a fiberglass product. Press a continuous strip of foil tape to all longitudinal seams along straight runs of duct.

Insulating exposed heating ducts in attics basements and under subfloors can improve the energy efficiency of a heating system. Check the speed of the blower motor on the furnace. After all most new homes have r 49 insulation on the attic floor holladay continues. 911 attic insulation services 911 attic insulation helps keep your attic clean sanitary and properly insulated and vented.

If necessary switch the wires to reduce the blower to its lowest speed. When insulating hvac ductwork use a foil faced fiberglass insulation with an r 6 or higher r value. Use metal flex or fiber board ducts that are insulated to code. In this video this old house plumbing and heating expert richard trethewey helps a homeowner insulate his ductwork.

So logically the ducts deserve more not less insulation. For an added layer of protection you can apply duct mastic to the tape and duct.