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Old 07-11-2013, 05:39 PM   #1
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T1-11 siding mildew growth


Hello All. I'm dealing with a very neglected N. facing exterior wall with T1-11 siding that has got some kind of mildew or growth on much of it. It's red in some places and gray in others. Please see pictures. I've tried scrubbing and power washing a small area and while it's lighter, it's still present. It's even 'infected' some exterior plastic conduit! I'm sure we shouldn't just paint over it, and I'm hoping someone can suggest a remedy short of replacing the siding. Any help would be much appreciated. Cheers!
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Last edited by scottmcll; 07-11-2013 at 06:27 PM.
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Old 07-11-2013, 06:09 PM   #2
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T1-11 siding mildew growth


Looks more like iron oxide to me. Do you have sprinklers with untreated water that spray on the side of the house?

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Old 07-11-2013, 06:27 PM   #3
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T1-11 siding mildew growth


Hmm, that side does get sprayed by sprinklers and it's well water, but other exterior walls get similarly sprinkered on and don't have this. It's only the N. Facing wall. CORRECTION - my original post mistakenly said S. Facing.
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