dimpled siding

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Old 11-11-07, 01:41 PM
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dimpled siding

we just bought a 7-year old house w/vinyl siding. The siding has quarter shaped dimples up and down in vertical lines around the pedestrian door, windows and garage door and they are discolored to be a little darker. They are only on the south facing side, where the sun hits the house. What could cause the siding to dimple in like that?
 
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Old 11-12-07, 04:08 AM
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I was hoping for an earlier response from someone who may have seen this before. In the meantime, how about posting a few pictures of this on a site such as photobucket.com and give us the urls, so we can see what you are seeing.
 
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Old 11-12-07, 01:52 PM
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Yeah, without a picture all I can do is guess that maybe someone had drilled a bunch of holes in the siding to hang christmas lights on hooks. When the owners needed to sell the place they might have called Dr. Vinyl, who came out and attempted to repair all those little holes and he didn't get an exact match on the siding because most siding colors fade with time.
 
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Old 11-14-07, 04:12 AM
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They're definitely not patched holes; more like something beneath the siding caused it. Hasn't been enough sunshine here in the northeast in about 5 weeks to make the discoloration really stand out so photos won't come out real well. Thanks for the replies anyway.
 
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Old 11-14-07, 05:19 AM
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You just reminded me of what you are seeing when you said, "something underneath the siding". It's probably the roofing nails under the siding. Sometimes you can see exactly where those nails are- especially if they are underdriven. The nails are good conductors of heat from the home. So in the early morning, when the dewpoint is very close to the ambient temperature, you get dew on the siding- but often, not where those nails are located- because they actually warm the surface of the siding slightly above the dewpoint. That explains why the surface is a little different color- it does not have years and years of oxidation on it. Sometimes you'll also see this on homes where you can see exactly where the STUDS are behind vinyl siding, and it's for the same reason.

There's no real solution- you could ensure the nails are properly driven- you shouldn't see or feel a big bump where they are located. But other than that, the only thing you could do is scrub the surrounding siding with some Zud or Bon Ami, and see if those are simply "clean spots" on your siding. Actually, all you siding should be that bright. Perhaps siding wash and a powerwasher would return ALL of your siding to its original brightness.
 
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