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Old 10-18-2013, 12:20 PM   #1
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New Windows, Old Siding


We replacing 7 double hung windows in our home. The windows are new construction, with the nailing flange. We currently have steel siding. Obviously to properly install the windows, we're going to have to either remove some of the siding or cut back the siding so we can install the window with flange and add flashing tape, etc. The question I have comes with the trimming of the window.

We'd like to use 1x4 pvc to trim the exterior of the window. The way I figure it, we have two options

1. Install the 1x4 trim then slide a j-channel piece under the siding and screw into the 1x4 all around the window.

2. Rabbit or build out the 1x4 pvc to act as a j-channel where the siding would slide behind the trim.

Any ideas or opinions on either?

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Old 10-18-2013, 02:10 PM   #2
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Option 2 would be fine for appearance, but not for shedding moisture. Simply caulking the siding to the trim would be better than that, but option one is better.

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Old 10-18-2013, 02:40 PM   #3
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J moulding is never screwed.
It will crack and bowed if screwed.
They sell PVC trim that's all ready dadoed. Any real siding supply can get it.
http://www.certainteed.com/products/trim/j-pocket
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Old 10-18-2013, 03:44 PM   #4
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J moulding is never screwed.
It will crack and bowed if screwed.
They sell PVC trim that's all ready dadoed. Any real siding supply can get it.
http://www.certainteed.com/products/trim/j-pocket
I'll look for that. The j-channel would be slipped underneath the siding (we couldn't nail it in properly with the siding already in place) and be attached or fixed somehow to the trim to keep it in place.
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Old 10-18-2013, 04:12 PM   #5
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Not the way I would do it but your going to be stuck with using trim nails and a pea shooter.
http://malcoproducts.com/product/roo...m-nail-punches
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Old 10-18-2013, 05:12 PM   #6
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You can make your own J-channel out of coil stock or form'able vinyl.

Homesealed is right that just making the trim J-channel'ish isn't going to work. Look at some of the options that Joecaption mentioned that are premade.
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Old 10-18-2013, 08:21 PM   #7
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You can make your own J-channel out of coil stock or form'able vinyl.

Homesealed is right that just making the trim J-channel'ish isn't going to work. Look at some of the options that Joecaption mentioned that are premade.
Thats exactly what I had in mind, metal would be appropriate since you already have steel siding. The other stuff that Joe mentioned is a viable option as well, you just really need to make sure that you still take care of the flashing details.
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Old 10-19-2013, 08:05 AM   #8
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The certainteed stuff looks fine. Do you install the window like normal covering the flange with flashing tape? Then is there extra flashing added elsewhere?

As far as getting coil stock, would I just need to rent a metal break and customize the j channel?
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Old 10-19-2013, 10:14 AM   #9
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Thats exactly what I had in mind, metal would be appropriate since you already have steel siding. The other stuff that Joe mentioned is a viable option as well, you just really need to make sure that you still take care of the flashing details.
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Old 10-24-2013, 11:59 AM   #10
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One more question....

What would be the best way to cut the metal siding? Would I circular saw with metal blade be better or snips or an angle grinder? Other?
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Old 10-25-2013, 08:43 AM   #11
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Circular with appropriate blade, hands down. The cordless models are very light and work great in that application.
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Old 10-25-2013, 08:59 AM   #12
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I like pvc to trim exterior window out .I think its a great maintenance free look. The wider the more aesthetic pleasing to the eye.
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Old 10-25-2013, 12:06 PM   #13
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Thanks.

Any preference on 4/4 or 5/4 pvc trim? Is one more preferred or does one have any advantages/disadvantages over the other?
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Old 10-26-2013, 10:53 AM   #14
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It depends on what you use at that interface and its depth (j-channel, siding,, etc). 5/4" is most common. What you want to avoid is the trim coming out flush with the j-channel or siding as that would make for difficulty in laying a nice bead of caulk.
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Old 10-26-2013, 11:24 AM   #15
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So here's what in looking at...i thinking it might be better to pull and replace the siding with new stuff. New Windows, Old Siding-image-3977958734.jpg

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