brendan713
Member
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- Nov 6, 2022
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- 17
Hi guys , I need to install head trim over my windows with dams on the ends. My question is do I still run J trim on top of it for metal siding ? If anyone had any pictures that would be great.
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Head trim on windows.
- Thread starter brendan713
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racecougar
Well-known member
Are we talking about R-panel or something else? Why wouldn't you use J-trim (assuming a vertical metal siding like R-panel) to receive the siding?
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brendan713
Member
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- Nov 6, 2022
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Where I’m from the building code requires a head trim ( drip cap ) with dams . Not just a J trimAre we talking about R-panel or something else? Why wouldn't you use J-trim (assuming a vertical metal siding like R-panel) to receive the siding?
racecougar
Well-known member
Right. You asked if you should install J-trim above that. I asked why you wouldn't.Where I’m from the building code requires a head trim ( drip cap ) with dams . Not just a J trim
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brendan713
Member
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- Nov 6, 2022
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- 17
Oh sorry , I just dint know if people still installed the J. If so is it usually same length as the drip ?Right. You asked if you should install J-trim above that. I asked why you wouldn't.
racecougar
Well-known member
Still assuming that we're talking about vertical steel siding like R-panel; the typical installation looks more like this: https://www.westernstatesmetalroofing.com/r-panel-part-ws-208-head-trim
Have you spoken with your inspector?
Have you spoken with your inspector?
When you say head "trim" I'm assuming you're talking about the flashing and not the actual window trim. The dam at ends complicate installing some sort of J-channel which typically need to drain at ends. If you cut the J channel inside of dams you'll need to leave a gap so the channel drains out front which isn't how it typically is done. Usually the top J channel will have tabs that go down into the J channel on sides. You'll also need to figure out how to cut face of the J channel so it appears to extend past the dam and look proper at connection on side.
If the head flashing incorporates the J for your metal siding, I don't see how it could include a dam if that's what is actually required. It will never drain. Suggest talking to your inspector you may not need the dam along with the J, which will drain out sides.
If the head flashing incorporates the J for your metal siding, I don't see how it could include a dam if that's what is actually required. It will never drain. Suggest talking to your inspector you may not need the dam along with the J, which will drain out sides.