Kevin
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Underground ductwork
19 Replies

Do you think the air loss will be minimal in the following situationUnderground duct with some separation at the joints, trenched and encased in pea gravel but surrounded with clay soil. There is…Continue

Started this discussion. Last reply by Bob Blanchette Oct 8, 2013.

 

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Bob Blanchette replied to Kevin's discussion Underground ductwork
"If the ductwork is damaged and/or has water in it, that needs to be addressed right away. If the ductwork is dry and not collapsed then go for the A-coil cleaning."
Oct 8, 2013
Dennis Heidner replied to Kevin's discussion Underground ductwork
"I disagree with cleaning the A-coil being more effective than fixing or moving away from underground ducts.  Huge difference. In ground ducting - if rotted out will leak air into the ground - even through the clay.  The clay may be…"
Oct 8, 2013
Diane Chojnowski left a comment for Kevin
"Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you! Don't…"
Sep 27, 2013
Eric Kjelshus replied to Kevin's discussion Underground ductwork
"look in to its like sewer liner Air Duct Restoration Duct Armor: Non-Destructive Air Duct Restoration Non-toxic Repairs rusty, moldy and deteriorated ducts Quick and easy 15 year transferrable warranty A Quality Solution For Both Rust And Mold In…"
Sep 20, 2013
Bob Blanchette replied to Kevin's discussion Underground ductwork
"Not sure how much if any air is leaking. If it is leaking where does it ultimately go? I agree, doubt it's worth messing with. If the A-coil is over 5 years old and not been cleaned, cleaning would yield a much quicker payback time."
Sep 20, 2013
Doug Garrett replied to Kevin's discussion Underground ductwork
"Seriously, underground ducts?  I've never seen it done where it didn't end up with rotted ducts, condensation standing in the ducts and growing healthy mold, attracting rodents who like the conditioned and safe nesting areas, and…"
Sep 20, 2013
jack Bartholomew replied to Kevin's discussion Underground ductwork
"So...the subslab duct is supply, which would provide dilution to the subslab zone through the existing air leaks. The non-operational system would provide pressure relief venting when the furnace is operating and potentially allow outside air to…"
Sep 19, 2013
Kevin replied to Kevin's discussion Underground ductwork
"The house is a long ranch and had a 220 cfm radon system. The system has vertical 3" pipe and a horizontal 2" branch pipe to another vertical penetration. The installer felt he needed two suction points. The 2" suction point is within…"
Sep 19, 2013
jack Bartholomew replied to Kevin's discussion Underground ductwork
"Wow. The radon monitor can be considered a good one but it is always best to use other devices that can be calibrated to compare the results. Pro-sirens seem to have a life and after 5 years the data can get iffy...especially when you are bouncing…"
Sep 19, 2013
jack Bartholomew replied to Kevin's discussion Underground ductwork
"When considering where the bottom (air barrier) of this house is, the clay soil is it because of the relative leakage of the ductwork. Without the duct system, the clay soil could still represent that due to leakage through the concrete slab at the…"
Sep 19, 2013
ken Neuhauser replied to Kevin's discussion Underground ductwork
"Moldy cheerios, mice poop, marbles and matchbox cars.  M-m-m-m!  Plus lots of cat hair if the house has cats.  I'm not a fan of floor registers even if they are not associated with below-slab ducts."
Sep 19, 2013
David Williams replied to Kevin's discussion Underground ductwork
"What about Mold??? "
Sep 19, 2013
Kevin's discussion was featured

Underground ductwork

Do you think the air loss will be minimal in the following situationUnderground duct with some separation at the joints, trenched and encased in pea gravel but surrounded with clay soil. There is also a 4" layor of pea gravel under the slab. The perimeter of the house is CMU block with clay backfill.i.e. do you think the clay will stop the air flow leakage like clay stops water flow.He wants to seal the ducts and I tell him he is wasting his money.See More
Sep 17, 2013
Dennis Heidner replied to Kevin's discussion Underground ductwork
"Unless you use a plastic like material - they rot out.  HVAC also is used for air conditioning.  Older 60's, 70's, 80's houses weren't as careful about insulating the foundation,  drainage, etc.  Even some of…"
Sep 13, 2013
ken Neuhauser replied to Kevin's discussion Underground ductwork
"Kevin, I agree, he would be wasting his money to seal the sub-slab ductwork. There is only one appropriate retrofit measure for ducts below a slab: fill with concrete and relocate ductwork within the building. I've put a camera in a sub-slab…"
Sep 13, 2013
Jose Macho replied to Kevin's discussion Underground ductwork
"I have seen in a 30yr old condo  below slab PVC pipe ductwork had major problems with the galvanized metal boots or couplings connecting the floor registers cut into the slab floor. The boots simply rusted out so most of the air…"
Sep 13, 2013

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At 2:34am on September 27, 2013, Diane Chojnowski said…

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