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foqus

08:54AM | 05/16/01
Member Since: 05/15/01
1 lifetime posts
Bvbasement
My girlfriend has a finished attic room with red cedar walls and ceiling. There seems to be a constant accumulation of grainy black stuff on the
floors all the time. She says that you can scrub the floors, and then the next day walk up there with white socks and your socks will be black. The
roofers said that it's certainly not from tar paper or anything like that.

Does anyone out there know what could be causing a black grainy substance like soot to be deposited on the floor of a room with red cedar walls
and ceiling?

thanks

marco

Jay J

06:29PM | 05/16/01
Member Since: 10/26/00
782 lifetime posts
Hi foqus,

If the windows are open during the day, it could be pollen. If you close up the entire room, and this still happens, then I really can't say. Maybe someone else has an idea.

My best to ya and hope this helps.

Jay J -Moderator

The Insulator

12:15PM | 05/17/01
Member Since: 01/25/00
14 lifetime posts
I would venture to guess that when the cedar was installed to the exterior walls & ceiling that there wasn't an air tight barrier put up first. It's common that mant will insulate such a situation with kraft faced insulation. Well the kraft batting is an adequate insulation & vapor barrier, it is not an air barrier (Poly accomplishes this service). The result is that air moves through the cracks in the paneling. Over time, black, fine, sooty dust accumilates. That dust falls back through the cracks & is carried by tha air currents back inside (If air can move our through a crack, when the wind changes, it can move back in).
Another variable is if blown or poured in insulation was used (Again without poly or another air barrier), some of the insulation could be falling through.
Unfortunately, short of tearing down the cedar & doing it right, it's a tough thing to solve. You could caulk the cracks, but that's a lot of caulk & as the wood expands & contracts, the seal is lost.
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