Insulate Plenum Attic

I don t see any mold or mildew on the joists the floor insulation is dry and there is no condensation anywhere except the supply plenum covered in condensation soaked on bottom and to lesser extent the return plenum.

Insulate plenum attic. Attic hatch or door. Hello i have a difficult situation. Should you always insulate the plenum on an attic furnace ac horizontal setup. Pull down stair or ladder.

Insulating the plenum on a forced air system. In a vented attic this can happen when the duct is in close proximity to conditioned space i e the ceiling and also thermally isolated from the hot attic beneath the ceiling insulation. Two other companies both use internally insulated and claim they are the way to go. My crawl space is averaging 72 humidity right now raleigh nc.

Typical ducts install between a plenum or large supply duct and. This isa recently installed system performing well indoor humidity steady at 45. 6 8 insulated fleixible duct lines come off of the plenum. After ripping everything out in the house and basement now the trunk is.

Two of the competing companies are rated second and third in a recent local area service rating guide one of which. In this case the temperature gradient between supply air and the ceiling can be such that the duct surface could be cooler than the local dew point. Affix rigid foam insulation to the attic side of the hatch or door. Then you ve got r318 4 to consider.

Insulating exposed heating ducts in attics basements and under subfloors can improve the energy efficiency of a heating system. Try r316 3 r316 4 r316 5 4 you might claim an exemption under r316 5 4 1 and 2 but could really piss an inspector off. Getting a new complete system inside and out. The plenum is about 7 feet long x 2 feet wide x 1 foot high.

Especially applicable in humid southern climates. Mine is an 80 furnace 92 ac. Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120. One company is touting externally wrapped insulation for the metal plenums as their key value proposition over internally insulated metal plenums.