This works out great for a window without any BM. If its something odd we use a J that matches the window color. Then we add matching J channel or custom bend aluminum matching J. We cut out the old window and cut back the siding to match the new BM. The BM has a small removable cap built into it for fasteners. It's a vinyl window with an applied Brickmould (BM). I'm tired of Winter!!! Time to move South! Maybe Randy can put me to work down South! Rain and snow until Sunday with highs in the 40's. I can tell by the ache that we are in for another cold spell. Arthritis in my hands last night was stopping me from typing a bunch. It's good to hear from you all! Thanks for taking the time to type all that out Mike. YouTube flashing videos do a nice job of help selling these jobs if the homeowner wants it not to leak and be right. No worries other than trying to get a fair labor charge from the homeowners. Very time consuming, however Mike Holmes won't be using you as an example a few years from now and when done correctly you have improved upon 99.9% of what short cuts the builders took. Now, one can do all kinds of neat stuff with exterior window moldings like the stuff from Royal. I agin like a product like Dupont Straight Flash. After correct flange nailing and jamb anchoring which helps by the way to have the outside guy give proper jamb adjusting tension before he starts going nuts on the flange anchors, you then are pretty much set for proper flange taping. With the new window frame out I like to inject a nice bead of low-expansion spray foam so I can set the window into a wet bed of foam.
#Replace j channel trim built in window windows
After flashing the sill with something like Dupont Tyvek Flex Sill we will dry fit the first couple of windows without the sashes in so we can test the fit for shimming and squaring. With sheet rock new blades in utility knife are a good idea.
I keep cordless multi-oscillating tools with good blades for the corner cuts on the stool and generally make the longer rips with a 6. It's nice to have helpers with good shop vacs with new filters to keep the dust done in the house. The cut back is around 5/16" give or take 1/8". I've found that since the new construction replacement windows like the Imperial LS has the standard 3.25" thick frame with a different flange offset than that of builder's grade single new construction low-end vinyl, one does have to perform a cut back to either the sheet rock or wood jamb extensions and stool. I've been utilizing the Imperial LS by Soft-Lite Windows for these types of installs with great success.
#Replace j channel trim built in window install
I like to install the same sized unit with a welded integral fin without a built in "J" in your case. I would carefully remove the existing siding around those openings and redo the Tvek/house wrap with matching manufacturing tape as needed.
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