Duct encased in slab


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Old 10-01-11, 03:40 PM
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Duct encased in slab

Any issues I should be concerned with duct under the slab or formed right in the concrete itself? Thanks
 
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Old 10-01-11, 03:52 PM
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If it is steel, and in contact with the ground/slab, it will rust away. They make plastic ducting for running underground.This is what I have seen on jobs: PVC Duct


If it is just penetrating a wall then I would leave a gap that you can later fill with insulation.
 
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Old 10-01-11, 05:36 PM
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Issue will be dirt, moisture, IAQ issues and they will always leak sooner are later
 
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Old 10-01-11, 05:46 PM
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Does your question relate to something that you are thinking about doing or something that you already have.

A bit more detail surrounding your question may get more info.
 
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Old 10-02-11, 11:48 AM
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Its is in a home my son is considering buying. House was built in 1960. Its a down flow hot air gas furnace. I could see directly under the furnace. It looks like what would be the plenum is just formed into the concrete slab. It doesn't look like there is any type of coating on the concrete. The floor registers seem small to me 2 x 10. My main concern here is mildew, mold, odors and possible rodents. My suggestion to him was to get them scoped to see if there are any issues. If there are issues what are the options to repair it? How did they construct these ducts?

Thanks for the help!!
 
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Old 10-02-11, 12:35 PM
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No good options! Fill it it and relocate duct over head.
 
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Old 10-02-11, 02:27 PM
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Thanks for all the responses!!
 
 

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