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Terence McCann

Water Stains on Exterior

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Along one wall you can see water stains coming out where the vinyl siding is. On the inside of this wall are two bedrooms and one bath with tub/shower.

Any thoughts on cause?

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The question is whether the moisture is on the surface of the house wrap or coming from the inner side of the house wrap, (or the 3rd possibility, no house wrap).

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Mine was a little easier to diagnose.

It was the bathtub water supply leaking. The supply was at the far end of the tub from the exterior wall but this was the only place the leak showed up.

Just another reason to (at least) walk the exterior AFTER you've finished the inside.

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I have found a few that the drain line from the tubs was leaking and where the shower pan was leaking.

Like Erby said walk the outside again after running the water.

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Sorry for not getting back sooner - was out of town with limited net access.

The stains/drip marks went the entire lenght of the wall which was apporx. 40 feet or so. No ac/line set located on this side of the home.

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It's crappy detailing and cheap vinyl. Did you pop a seam and see of there was a WRB under it?

No Tom, did not. I did however recommend that a siding guy unzips some of the siding on this wall a takes a look-see at what's going on.

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