Depends on what type of sealing you are talking about. If you mean a liquid sealant sprayed inside the duckwork, what's the point? Unless you have degraded lined ductwork or, god forbid ductboard,then I don't understand what you would be sealing. I know there are lots of companies out there that promote this kind of larceny but the only thing it does is make the CEO's boat payment. Clean the ducts and keep them clean. That's the best solution. As for lined ductwork, not the best solution in residential or commercial situations. Ductboard is cheap and the worst possible idea in any situation.
Sealing duct systems is critical when they are located in unconditioned spaces (attics and crawl spaces). A good practice to provide temperature control and energy efficiency in all duct systems.The video did puzzle me, however. I don't believe use of UL 181 tape over mastic is an approved method and I can tell you from experience, it won't work. I suggest that in areas where a gap in the duct is to be bridged with nastic; a layer of fiberglass mesh tape be embedded into the mastic and another coat be applied over the tape.
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Originally posted by ProAdmin: Please share your thoughts on this Best Practice.
