Burnt Joist Plenum


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Old 10-01-17, 12:50 PM
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Burnt Joist Plenum

In 2 of my basement furnace returns they go between floor joists that had been fire damaged in the 50's. Thing is cleaning those ducts becomes problematic...the charred stuff seems to keep dust clung to it, and little black bits still fall into the ducts
especially when duct cleaning happens.

Is there a suggested way to seal off the charred wood to smooth it out? --Preferably one that doesn't stink up the house with chemical odor? Thanks!
 
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Old 10-01-17, 12:54 PM
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I would think anything would do a good job sealing.
Even expanding foam spray would work for that if there is a metal duct that runs between the burned joists.

If two of the floor joists are panned off and used as a return.... there is very little that can be done with that without removing the panning material.
 
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Old 10-02-17, 06:55 PM
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Yeah I figured on removing the pan. I'm not crazy about spray foam though. Is there a thick paint I can use? Preferably non-toxic. My wife and I have chemical sensitivities..
 
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Old 10-07-17, 02:12 PM
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How difficult would it be to install a full sheet metal duct between the joists?
Geo
 
 

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