Tom Raymond Posted March 25, 2012 Report Share Posted March 25, 2012 This roof cover is clearly toast, but any idea what is going on here? This is the view from the ridge down. Click to Enlarge 28.81 KB This is a close up of an unstained shingle. Click to Enlarge 38.65 KB Close up of stained area. Click to Enlarge 32.66 KB It isn't clear what caused the stains, the only trees close to the house are evergreens, or why the stains would appear varnished. I look forward to learning something. Link to comment Share on other sites More sharing options...
hausdok Posted March 25, 2012 Report Share Posted March 25, 2012 The stains are a form of algae. It will grow in shaded areas right on the roof surface. The shingles look like they're either really old or are reacting to some kind of chemical. Did you test a corner of a tab to see if they're crystalized all the way through? ONE TEAM - ONE FIGHT!!! Mike Link to comment Share on other sites More sharing options...
Tom Raymond Posted March 25, 2012 Author Report Share Posted March 25, 2012 Did you test a corner of a tab to see if they're crystalized all the way through? ONE TEAM - ONE FIGHT!!! Mike No need, they crunched when I walked on them. The shiny-er, the crispy-er. Link to comment Share on other sites More sharing options...
Jim Katen Posted March 25, 2012 Report Share Posted March 25, 2012 Are you saying that the shingles weren't wet when you took those pictures? Link to comment Share on other sites More sharing options...
hausdok Posted March 25, 2012 Report Share Posted March 25, 2012 Maybe some kind of clear coat applied to the roof that's reacted with the shingles. ONE TEAM - ONE FIGHT!!! Mike Link to comment Share on other sites More sharing options...
Tom Raymond Posted March 25, 2012 Author Report Share Posted March 25, 2012 It was a bit misty, but the sheen wasn't from water. I did the whole exterior in a tee shirt and got little more than damp. Link to comment Share on other sites More sharing options...
Jim Katen Posted March 25, 2012 Report Share Posted March 25, 2012 It was a bit misty, but the sheen wasn't from water. I did the whole exterior in a tee shirt and got little more than damp. Never seen shiny shingles like that before. The black algae streaking is common around here. The brittle, buckled, crunchy shingles are just old. Link to comment Share on other sites More sharing options...
kurt Posted March 25, 2012 Report Share Posted March 25, 2012 Ugly and crispy, but that roof could last another 10 years if it was steep enough. I see a lot of crispy roofs that just won't die. Link to comment Share on other sites More sharing options...
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