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oldhomemystery 04-29-2012 04:22 PM

Mystery Substance leaking
2 Attachment(s)
Can anyone help me identify what this may be. I just noticed a little access hatch located behind my furnace- leaking. It appears to be orange/brown in colour and dries to some type of crust.

I live in a 55 year old house and we recently had some plumbing work done 5 months ago to replace the ceramic pipes running under the house. I wonder if it's related to the mystery substance?

kok328 04-29-2012 05:34 PM

Efflorescence. Minerals (calcium, salt, lime) being leached/washed out of the concrete due to moisture such as a water leak.
Is it possible that what ever plumbing work you had done was to correct a water leak or perhaps created a water leak?

JoeD 04-29-2012 05:48 PM

Open the hatch and take a look.

oldhomemystery 04-29-2012 08:13 PM

2 Attachment(s)
broke the hatch prying it open with a crowbar, but this is what we found

oldognewtrick 04-29-2012 08:22 PM

Is there a flue cap at the top of the furnace vent?

oldhomemystery 04-29-2012 08:24 PM

there's a new furnace installed - so as far as we know this access door isn't connected to anything inside the house. It only recently start leaking that crusty orange stuff so water must have gotten in there somehow.

oldognewtrick 04-29-2012 08:29 PM

What is the access door for? A chimney

oldhomemystery 04-29-2012 08:33 PM

That's the mystery, the access door is located on the wall behind where our furnace is installed. We have no clue where it leads to.

oldhomemystery 04-29-2012 08:54 PM


We googled chimney cleanouts and the pictures we found are exactly like what we're dealing with. Apparently all the raining recently caused the flooding. I need to get the chimney cap fixed and have something brought in to seal the cleanout permanently.

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