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white chalk like substance on roof rafters
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o'neill, middx
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[#1] Posted: 06/11/2012 - 04:11:16 AM		Reply with Quote
I have just been up in the attic and found patches of a white substance on some of the rafters. If you rub it with a cloth it comes away like chalk dust. Is it white mold and whats the best way of treating it?
sean o'neill
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Chicago, IL
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white chalk like substance on roof rafters
 [#2] Posted: 06/11/2012 - 06:19:36 AM		Reply with Quote


Maybe. Wipe it off.
Kurt in Chicago

"If I smell it, it goes in the report".............Phillip Smith...2012
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white chalk like substance on roof rafters
 [#3] Posted: 06/11/2012 - 06:59:16 AM		Reply with Quote
Or not.
Tom

http://clearcreekhomeinspection.com/

Life is tough enough as it is, it's tougher when your stupid. Don't do stupid things.
Dr Joe Lstiburek
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white chalk like substance on roof rafters
 [#4] Posted: 06/11/2012 - 07:28:44 AM		Reply with Quote
Get a gallon of BoraCare, mix it with a gallon of water and then go up in there and apply a light spray of BoraCare to the rafters and the underside of the roof deck. Make sure you're attic is well ventilated.

Go on with life.

ONE TEAM - ONE FIGHT!!!

Mike
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white chalk like substance on roof rafters
 [#5] Posted: 06/11/2012 - 07:54:13 AM		Reply with Quote
Older house, shiplap sheathing, could be concrete dust.
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Kenmore, WA
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white chalk like substance on roof rafters
 [#6] Posted: 06/11/2012 - 08:08:52 AM		Reply with Quote
Quote: Originally posted by John Kogel

Older house, shiplap sheathing, could be concrete dust.
That's true. Lots of old houses around here have the form boards recycled into the attic and they are covered with not only concrete but many have a layer of white efflorescence at the rim of the water stains.

ONE TEAM - ONE FIGHT!!!

Mike
   
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