Jet Black Floor Joists With Creote-like Substance? - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 01-22-2014, 12:19 PM   #1
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Jet Black Floor Joists with Creote-like substance?

We live in a 2-story Georgian (w/ basement) built in the early 1950s.

We recently discovered a busted drain pipe running thru an interior soffit in our Kitchen. The plumber suggested it was a longstanding problem (many years) even though we just started noticing any evidence of the problem (water leaking into the kitchen thru the wall/soffit).

When the plumber opened up the soffit to replace the pipe we noticed that the underside of the floor above the kitchen and the floor joists were jet black - almost if they had been sprayed with something.

At first, from a distance, we also thought there was a significant amount of black mold, however, upon looking closer, it looked more like the creosote buildup you might find in a chimney. In some sections, it looked almost like it was 1/2 inch to 1 inch thick.

The plumber thought it might be insulation sprayed with some sort of black tar.

Any thoughts on what it could be? Harmful?

(I apologize for not having photos to share at the moment)
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Old 01-22-2014, 01:07 PM   #2
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Never heard of black spray insulation. Could it have been the remains of a past fire?
I think if it was creosote you would smell it. What is it like if you scape it? hard? soft? black all the way through or painted spray foam? Can you post a picture?
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Old 01-22-2014, 05:52 PM   #3
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start checking for insect damage. that sounds like what wood looks like after capenter ants or termites come over for dinner.
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Old 01-22-2014, 08:40 PM   #4
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There would be no reason for creosote on a second floor.
And it would never be that thick, it was just a brushed on coating.
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
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