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Old 07-12-2015, 03:57 PM   #1
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Window install help


Hello,

I purchased a block style vinyl picture window without a nailing flange for a new construction wall. I originally intended on getting brick laid on this wall but now and going to install siding surround the window. My question is how do I properly install a window without a nailing flange so that it's water tight? It's smooth around all the sides with no pre drilled holes. I don't know how to weatherproof the exterior prior to laying the J channel and vinly siding.


Thank you in advance!

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Old 07-12-2015, 04:08 PM   #2
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Window install help


Keep the wood sheathing 1/4" to the sides and top of the window.
Install tyvec/tar paper integrated with adhesive perimeter membrane flashing. There's a specific layering involved in this process. You need to follow it.
In your case the membrane will run up the sides of the window to compensate for the lack of a nailing flange.
Apply a drip edge over the window and under the membrane flashing.
You can check out the process on You Tube from one of the window manufacturers like Andersen, Marvin, etc...

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Last edited by Ron6519; 07-12-2015 at 04:10 PM.
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Old 07-12-2015, 08:31 PM   #3
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Window install help


Just hate to see you have to do it that way.
I've had to back way to may times and replace walls where someone tried to use a replacement window instead of a new constrution window.
If it was mine I'd be using 1 X vinyl lumber to trim it out not J molding around the window, main reason it's less flexable where it's most likely to leak. Use the J on the outside of the vinyl lumber.
Z molding over the top.
Window needs to be installed so it will sit out beyond the PVC lumber.
If not water will get in under the trim.
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