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Old 05-18-2014, 08:19 PM   #1
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Installing Replacement Window and Existing Wood Siding

Hello everyone,

I'm new here and I love DIY. I want to replace the old windows myself but want to hire a contractor to install the siding at a later date. My question is with the placement of the windows. Most installers suggest to leave the old wood siding on and they will go over top with the new siding.
Now my question is if I replace the windows with windows that have the J channel formed into them do I install the window against the sheathing behind the siding or should I shim out the window the thickness of the wood siding 3/4".
I would think that the outside dimensions of the new windows is probably larger than the old ones although I could cut the wood siding to make it fit.

Any help would be greatly appreciated.



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Old 05-19-2014, 07:58 AM   #2
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Are you installing this as a replacement (as it says in your post title), or new construction? If the former, scratch the intgral j-channel and get an appropriate replacement window. If you want the integral j-channel and new construction style install, it is really design to have the siding torn off and start from scratch. I suppose you could build it out to accept new siding over the wood, but I am not crazy about that at all. Leak waiting to happen IMO.


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Old 05-19-2014, 08:51 AM   #3
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Only time I'd suggest removing the old siding is if it's in really bad shape, or it's over balloon construction framing and you need to rewire and insulate.
More commonly the window and door trim is built out and is wrapped in coil stock to cover the wood, then a replacement window is installed. Siding is installed last.
Only reason in most cases to go with a new construction window would be if all your sills are rotted out.
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