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Are darkened areas on roof plywood & rafters a concern?

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Dark areas on roof plywood & rafters are on the North side only.  These areas have increased in size over the last 15 years.  Thge wood is still hard - no soft areas.  Should I be concerned?
asked in Attic Area by banasjo (120 points)
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1 Answer

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Hi banasjo,
I don't know if you had a chance to go over my articles in "Attic" category - http://checkthishouse.com/category/attic where I explain pretty much everything about attic mold. decking discoloration, etc.
Is the condition you're describing a reason to be concerned? I would do a little investigation / evaluation of the attic ventilation ports. Similar thing happened in my attic and the reason was a bunch of cottonwood trees surrounding my house. Every winter the decking and some rafters discoloration (North side) was getting darker and expanding significantly.
When I looked at the ventilation ports along the soffits they were all clogged up with cotton and dust, all it took was a powerful vacuum to remove all that contamination. One side of the soffit was easy since I have a first floor roof beneath, on the other side it took a few ladder trips to do the job.
Is it mold or not, toxic or not? You'd have to lab-test some samples to answer those questions.
In case you don't have any soffit vents, check for contamination whatever type of attic ventilation you have: upper and lower... and check my posts at the link above from more tips
answered by darekrudy (21,730 points)