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Black Plywood


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This is in the attic of a circa 1960's ranch. Multiple layers of composition shingle over plywood. The underside of the decking at the rear roof with northern exposure is stained black. more so toward the eaves. The south side is relatively clean. Any idea on what would cause this? First pic is south side, second is north side.

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The good news is that the fix is cheap. A foot of cellulose will triple the R-value, affect enough air sealing to prevent any further condensation and staining, and present an adequate phisical barrier to keep all but the nosiest homeowners out of the attic. The vast majority of our cells jobs are under $2K.

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I'm a believer. The jobs we've done where a cheap layer of cells is applied all magically improve and the problems go away.

I remember when we all thought the stuff was crap because it compressed. Who'da thought in 1982 that was a benefit?

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