We got a new air conditioning/heat pump system. It was recommended
that we get an energy audit from our electric company (free) and they
recommended a door blower test. The door blower test is paid half by
us, half by power co. One of the things they look for are leaks in
the ductwork. Our house was built in 1983. Does the tape they use at
the seams just start to deteriorate at some point? My husband thinks
its a waste of money to have this done and I don't know....any
opinions from people who work with this kind of thing. Thanks.
I doubt if it is a waste of money, but no one can guarantee it.
There have been and are various types of tape and sealer used on ducts.
Some are lucky to last a couple of years and others usually last a life
time. I must add that in addition the materials the workmanship is very
important as is the design.
If you are getting the blower door test paid for 50% by the power
company, Id strongly suggest you do it.
Keep in mind though.........
IF you arent interested in saving money or doing the actual "repairs"
to stop the air leakage then its a complete waste of time and money.
Also, as with any other company or service, its only as good as the
company/tech performing it. You might want to do a little research and
get some references by the company/s doing it.
In the past most approved 'duct tapes' were rubber backed cloth tape. As
time passes, the adhesive looses it's ability to "stick" and the seal at the
joints is lost.
Currently the industry standard is to use tape which carries a UL-181
approval [printed on the tape backing.] This newer breed of tape adhesive
has a much higher degree of quality and longevity. As well, it is
recommened that a mechanical restraint [zip tie] be used to keep the joint
solid and leak free.
Most homes with older duct systems have a leakage rate of around 30%. If
you reduce that rate, the amount of heating and cooling will now be directed
into the home where you and your family will benefit.
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