whitish deposits on chimney from gas furnace

**Ken Meyer** · 09-08-2008, 09:44 PM

Any idea what is causing these whitish deposits on the chimney below the gas furnace flue? I know the chimney needs a lot of work. I could not get up to the top to take a good look, too steep for me!

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**Billy Stephens** · 09-08-2008, 09:48 PM

Ken,

Looks like Dryer Lint to me .

**Raymond Wand** · 09-09-2008, 04:40 AM

Could be efflorescence, caused by a gap in the liner spilling combustion gases which are laiden with moisture or rain entry into the damaged cap.

**wayne soper** · 09-09-2008, 05:14 AM

Ken, That looks like the cement paste they used to seal the liner connection mabey got rained on before it set up and some of it washed down the side of the chimney. You normally wouldn't have a round cap unless a new liner had been installed. If clay liner, square cap.

Brian Thomas · 09-09-2008, 06:00 AM

I would have thought efflourescense too. But that doesnt really look like it to me. It looks more like something that spilled up there like wayne said.

**Ken Meyer** · 09-09-2008, 06:54 AM

Thanks Wayne & Brian,
There is a stainless steel liner visible going into the chimney from the basement. Assuming it goes all the way up, your idea makes sense. I'm not familiar with the cement paste you mentioned, I'll do some research on that. I'm going to stay in touch with the buyer and find out what the chimney guy has to say when he gets up there.

**Jerry Peck** · 09-09-2008, 07:29 AM

Originally Posted by Brian Thomas

It looks more like something that spilled up there like wayne said.

Something spilled or wash(ed)(ing) off.

There is some on that wire wrapping around the chimney, so it looks like something 'ran off and over the edge'.