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white chalk like substance on roof rafters


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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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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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