insulation for ducts
insulation for ducts
(OP)
I am new here. I am currently distribute ducts from a roof top unit. I am told to add a 1" insulation from the output of the roof top unit in a distance of 25'. I donot know why it should be 25'. what should I do if my main duct are less than 25'???





RE: insulation for ducts
RE: insulation for ducts
RE: insulation for ducts
The codes / standards are based upon physical location of the building and location of the duct inside or outside the structure. The codes / standards have tables of minimum R value required.
RE: insulation for ducts
RE: insulation for ducts
RE: insulation for ducts
Depending on the length of supply air duct the tail end also need to be insulated to ensure the room temperature is same all around.This insulation is to limit the temperature rise to minimum.
All the above is external Thermal insulation .
RE: insulation for ducts
There is nothing to stop anyone from using better than R8 if that would provide a beneficial bang for the buck.
But the bottom line is R8 on the roof is a minimum, i.e. usually about 2" of good insulating material on the inside.