Adding plywood/ new wrap around existing windows

803 Views 10 Replies 3 Participants Last post by Nealtw, Apr 30, 2020

ckbell

Discussion Starter · Apr 29, 2020

We purchased an old house that needs the siding/wrap replaced and there is currently no plywood underneath, but the windows have already been replaced. We would like to leave the new/existing windows, remove the siding/old wrap, and add plywood and new wrap prior to doing the siding. What is the best way to accomplish this while leaving the existing windows in place? Does anyone have any tips or a good video on how too? Thanks

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Nealtw

· #2 · Apr 29, 2020

I would pull the window and prep the hole properly and re install them.

Often replacement windows are not installed correctly and if they were you are throwing good work away.

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ckbell

Discussion Starter · #3 · Apr 29, 2020

Are there options that don't involve removing the windows and starting over? The kitchen has a brand new quartz countertop and and the window sills are the same quartz

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Nealtw

· #4 · Apr 29, 2020

ckbell said:
Are there options that don't involve removing the windows and starting over? The kitchen has a brand new quartz countertop and and the window sills are the same quartz

Maybe you could find a way to cheat, once you see what you have.

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carpdad

· #5 · Apr 29, 2020

Maybe house wrap can be taped to the window flanges, then plywood, then pvc trim around the window, osi quad caulk around the window/trim joint, use window drip edge and side. This gives double leak protection. If caulk fails or such, vinyl siding always lets some water in, house wrap will keep the leak away from the stud bays and inside. This wrap should be continuous under the window to foundation and to outside. Once vinyl start course is installed, cut away the excess.

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ckbell

Discussion Starter · #6 · Apr 29, 2020

Thank you!!

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Nealtw

· #7 · Apr 29, 2020

carpdad said:
Maybe house wrap can be taped to the window flanges, then plywood, then pvc trim around the window, osi quad caulk around the window/trim joint, use window drip edge and side. This gives double leak protection. If caulk fails or such, vinyl siding always lets some water in, house wrap will keep the leak away from the stud bays and inside. This wrap should be continuous under the window to foundation and to outside. Once vinyl start course is installed, cut away the excess.

It is about trapping the water around the window and giving it a path out. :wink2:

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carpdad

· #8 · Apr 29, 2020 (Edited)

Well, if mohamed won't go to the mountain, mountain must go to him, or some such saying.:smile:

I think osi quad caulk will serve well over long term. Caulk the joints between the window and the trim. I caulked the window edges before vinyl j channel was applied so the caulk wasn't just sitting on the surfaces. Also when using channels around a window, top and sides got j channel and the bottom was finished with finishing trim. I was guessing it presents less chance for water to find its way behind. I caulked the bottom edge first, this trim and caulked the joint again.

Window bottoms get a flashing. This flashing is wide enough to go over the lip of one course below. Check vinyl siding manuals. This way, if water leaks, water won't be using the house wrap as a drainage plane. This time, I'm planning to drill (no such punch) some holes at the locking joints so water has some immediate places to drain.

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Nealtw

· #9 · Apr 29, 2020

carpdad said:
Well, if mohamed won't go to the mountain, mountain must go to him, or some such saying.:smile:

I think osi quad caulk will serve well over long term. Caulk the joints between the window and the trim. I caulked the window edges before vinyl j channel was applied so the caulk wasn't just sitting on the surfaces. Also when using channels around a window, top and sides got j channel and the bottom was finished with finishing trim. I was guessing it presents less chance for water to find its way behind. I caulked the bottom edge first, this trim and caulked the joint again.

Window bottoms get a flashing. This flashing is wide enough to go over the lip of one course below. Check vinyl siding manuals. This way, if water leaks, water won't be using the house wrap as a drainage plane. This time, I'm planning to drill (no such punch) some holes at the locking joints so water has some immediate places to drain.

Have you seen a window pan installed for rainscreening the window?

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carpdad

· #10 · Apr 30, 2020

Window pan is nice to have but there are times when not everything one wants will work. Window pan assumes that the window WILL leak. I can't refute that, but with double and triple uses of after thought flashing

smile

and caulking, there is no reason to think that window WILL leak. The op must understand the ideas of keeping water away, though. Window pans and tapes assume standard construction where materials are assembled with the time and profit in mind, but if diy and taking time, other ways can work too, imo.

https://www.diychatroom.com/f9/vinyl-siding-diy-project-leave-professional-540890/

http://inspectionwerx.com/home-inspection-quality-vinyl-siding-installation/

OP: around j channel is very weak areas for vinyl siding. Learn about extra flashings around here.

Mastic vinyl siding has many colors. Find out which outlets (roof/siding stores) and ask which color choices have matching caulk colors. Other brands probably about the same quality. Homedepot may not. White caulk on white vinyl maybe easy but show up as dirt catcher too quickly.

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Nealtw

· #11 · Apr 30, 2020

carpdad said:
Window pan is nice to have but there are times when not everything one wants will work. Window pan assumes that the window WILL leak. I can't refute that, but with double and triple uses of after thought flashing smile and caulking, there is no reason to think that window WILL leak. The op must understand the ideas of keeping water away, though. Window pans and tapes assume standard construction where materials are assembled with the time and profit in mind, but if diy and taking time, other ways can work too, imo.

https://www.diychatroom.com/f9/vinyl-siding-diy-project-leave-professional-540890/

http://inspectionwerx.com/home-inspection-quality-vinyl-siding-installation/

OP: around j channel is very weak areas for vinyl siding. Learn about extra flashings around here.

Mastic vinyl siding has many colors. Find out which outlets (roof/siding stores) and ask which color choices have matching caulk colors. Other brands probably about the same quality. Homedepot may not. White caulk on white vinyl maybe easy but show up as dirt catcher too quickly.

Vinyl siding leaks, house wrap stops the water.

Your link is showing a how to, that would almost guarantee a leak.

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