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Vinyl belly band / trim details.


Brandon Whitmore
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Looks like what you have there is all too often just what I see here. A job that looks good from the buyer's car but won't keep water out. The problem is that the damage won't likely show up until after all warranties are up. Around here it won't, anyway. Your neck of the woods sees more rain. The mfr admits that their siding will let water get behind it. Therefore, there must be additional flashing and barriers installed. The problem is that all too often no one takes responsibility for seeing that those things are done.

The horizontal bands are a particular problem. A board clad in aluminum with no head flashing and only an inverted "J" channel on the bottom side. Nothing to keep water from getting behind the siding.

But hey, it's vinyl...the ads say it's maintenance free!

Right????[;)]

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Originally posted by Brandon Whitmore

What do you guy's think of these details/

I think they're painfully common. They leak like sieves. If the water resistive barrier underneath the vinyl isn't detailed perfectly, it's a mulch farm in a year.

Ideally, head casings and drip caps at any horizontal break in the siding.

Never see 'em....

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Those are pretty ugly details. Unfortunately not too many people, installers incuded, realize that even properly installed vinyl allows up to 20% of the water that hits it to go through it. Underlayment is key to keeping the building dry.

With the level of detail on those buildings that siding should take in the range of 10-12 man hours per square to install and detail properly. I'll bet that there aren't that many hours into the siding you have pictured.

Tom

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I just noticed on the installation details I posted, that the manufacturer calls for the bottom piece of window flashing to overlap the piece of siding below. I have never seen that detail before. I can't grasp how that would be properly done.

Has anyone installed vinyl siding with the bottom piece of window flashing installed to drain directly to the exterior?

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While we are on the subject of vinyl, I thought this would be an interesting addition. My dad installed vinyl on the home he (we, kind of) build in the early '80s. I pulled off the siding on one wall to do some repairs and replacement of sheathing. The Tyvek housewrap was completely shredded along the entire wall. I looked like the expansion/ contractor of the vinyl was shredding the material. It makes me wonder how effective a properly installed housewrap is behind this material.

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