If the ducts of the HVAC
system run through unconditioned spaces in the house, such as a
crawlspace or an attic, then the ductwork should be insulated.
The ductwork should not leak air. Leaking joints should be repaired
with mechanical fasteners and then sealed with water-soluable mastic and
embedded fiber mesh. Gray-cloth duct tape should never be used for
this purpose. It degrades, cracks and loses its integrity and bond with
age. If the joint is going to be opened up in the future for
maintenance or other reasons, then aluminum foil tape might be
installed.
A.T.Martin Home Inspection
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