Then you ve got r318 4 to consider.
Insulate plenum attic.
Describing the general internal insulation technique to stop your ac unit from sweating on the outside.
Typical ducts install between a plenum or large supply duct and.
Mine is an 80 furnace 92 ac.
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.
Getting a new complete system inside and out.
Especially applicable in humid southern climates.
Hello i have a difficult situation.
Insulating exposed heating ducts in attics basements and under subfloors can improve the energy efficiency of a heating system.
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.
6 8 insulated fleixible duct lines come off of the plenum.
Two of the competing companies are rated second and third in a recent local area service rating guide one of which.
One company is touting externally wrapped insulation for the metal plenums as their key value proposition over internally insulated metal plenums.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
My crawl space is averaging 72 humidity right now raleigh nc.
This isa recently installed system performing well indoor humidity steady at 45.
I had to completely gut the existing hvac system in my 1991 house due to numerous major issues flex tubing like swiss cheese facing into the plenum kinks leaks a branch off the end of the trunk returns in the wrong place missing registers in some rooms too many in others etc.
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.
Attic hatch or door.
Should you always insulate the plenum on an attic furnace ac horizontal setup.
Affix rigid foam insulation to the attic side of the hatch or door.
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.
Two other companies both use internally insulated and claim they are the way to go.
