Corrosive roofing shingles damaging painted siding?
Has anyone seen this before? The paint on my siding is being eaten away, and it appears to only happen in places where rain can either bounce off the shingled roof or run down onto the paint from a roof gully. This just started happening about a year ago in a couple tiny spots and is suddenly looking really bad.
The roofing is architectural shingles, but I don't know what brand. The siding is cement board that was pre-primed then painted about 6 years ago. You can see pictures at the following website: http://home.comcast.net/~pyecomber/paint.htm
I'm wondering if there is anything I can do to prevent this from happening again. Or any recommendations on repainting other than scraping off flaking paint, and using good quality primer and paint.
Thank you in advance for any help!!!