White spots all over vinyl siding

dinosaur1May 22, 2011


Can anyone assist me with what might be causing these white spots all over my vinyl siding?

Home was built in 1997

Builder still around

Original siding contractor our of business

Homes around me have no siding issues

Original contractors son point to to oxidation and a reflection of light off of windows. Behind the white spots are the nail heads. Is it possible there is no tyvek underneath?

Mastic.com is the manufacturer. Their warranty covers defects 100% to the original owner. 10% for the 2nd homeowner. Were the 2nd homeowner unfortunately.

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looks like the nailing pattern for plywood
not tyvek.
even with tyvek you have exposed nail heads.

it is possible that tyvek isn't installed
impossible to know without taking a piece of
vinyl off to see.

what is your location?

    Bookmark   May 23, 2011 at 8:53AM
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Depending on the pH of the rain it could just be zinc from the nails holding the siding itself.

Does it wash off?

You could even try some white vinegar and see if that takes it off.

    Bookmark   May 23, 2011 at 1:05PM
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the 3 things I thought of were
frost on nail heads if the condition happens in cold weather.

oxidation of nails

acid rain

post back OP and let us know where you are located.
and if you are near salt water...

    Bookmark   May 24, 2011 at 7:05PM
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We live in Milwaukee, WI. Is it worth doing an insurance claim?
They can't get rubbed off or washed off.

    Bookmark   May 24, 2011 at 7:42PM
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It does not appear to be a sudden problem, but a long term maintenance issue.

Not what insurance was designed to cover, but you might get luck and your rates not go up excessively (or your house get branded 'not insurable').

Did you try some distilled vinegar?

It dissolves zinc leaching nicely.

    Bookmark   May 25, 2011 at 10:00AM
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You've been asking this question for years. I thought the siding contractor's son was going to help you make a claim for defective siding.

Vinyl/PVC is not particularly strong or durable; it's main claim to fame is that it is inexpensive. If the plasticizers used are not of high quality, or the manufacturing process went awry, the PVC can become prematurely brittle and perhaps that process is affected by the support brackets or nails. Thin PVC can be dissolved by certain solvents used in sealants and self adhering waterproofing membranes. Also that strange texturing that makes PVC siding look like poorly surfaced wood clapboards is a good surface for fungus/mildew to grow.

    Bookmark   May 25, 2011 at 8:02PM
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I misread the date of another post on another forum so perhaps this problem is a new one.

I found your lack of patience and courtesy with people offering free advice to be troubling.

    Bookmark   May 25, 2011 at 8:10PM
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I haven't been asking this question for years. Lol. Wow

    Bookmark   May 25, 2011 at 11:44PM
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