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Question DetailsAsked on 10/26/2014

Our Air ducts are in the slab and we have difficult access in our home- what should we do- repair or replace? how?

We just purchased a home 2 months ago with ducts in the slab. The home was built in 1974 and is a post and beam deck house where retrofitted ducts would be a very difficult task. We were first told that they might be an issue for our radon system- but this wasn't an issue- our levels went from 5.1 to 2.6 after the system was installed. Then we had our ducts cleaned and were told there was a significant amount of mold in them (wish we had pictures but they didn't do that), so we had someone come out and scope them and it looks like the in slab ducts show signs of rust just on the bottom and mainly around the perimeter of our home (just for 3-4 feet in the basement ducts b4 exiting to room). I have had water/foundation experts tell me that because there are no signs of water damage in our home, they do not feel that there is an underlying water issue that needs to be re mediated. We plan on staying in this home long term. Do you recommend Aeroseal, Duct Armour, New system, or ??? Thanks!

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Since putting ducts in the walls/floors would be tough or excessively unsightly and certainly replacing the system in-place is expensive andtear the heckout of your floors, so I would say cleaning and AeroSeal or equal would be a minimal possibility but proably not a long-term soluton.

A higher-end and far more permanent solution is in-place relining of them, the same way sewers and large water mains are relined - with a pipe reliner system that basically inflates a resin-saturated fiberglass or synthetic fabric sock inside-out in the duct which then hardens in place, then they go back and cut out the intersections and reseal the joints there. Other systems use a spray resin system using a wand in the duct, basically building up a liner inside the duct. These sort of relining systems get past the inevitable rust-through that will occur with the ducts over time - and since you have rusting in the bottom now, that probably means you have ground moisture getting into the ducts from the concrete as water vapor, contributing to your problem - whcih will only get worse with time if you do not replace them one way or another- relining or total replacement, and the latter does not sound like your preferred solution here.

Answered 6 years ago by LCD

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