Need some advice on triming windows when using fiber cement lap siding. Read through the certainteed instructions last night and am confused about their recommendation to use a 1/2″ minimum “sub trim” piece.
Can anyone shed some light? Thanks. Andy
Need some advice on triming windows when using fiber cement lap siding. Read through the certainteed instructions last night and am confused about their recommendation to use a 1/2″ minimum “sub trim” piece.
Can anyone shed some light? Thanks. Andy
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Replies
I like 5/4 Miratec. Install corners and trim first, then butt the siding. No need to use any build up material.
Miratec is heavy and you can't countersink into it. But then again so is your siding! :)
An alternative is 5/4 x 6 cedar decking. Rip 3/16" from either side to square it up (or use a jointer if you're lucky enough to have one). More work but means you can countersink.
Edited 10/25/2007 7:38 pm ET by canoehead2
Whatever you use, you might want to bevel the top edge of bottom window trim to allow water to shed. 1" is a pretty big shelf for water to collect on right next to your nice new window frames.
When I've used 5/4" cedar, it was easy to do with a jack plane - nice smooth finished surface.
We put a 30 degree bevel on the top of sill trim and a rabbit on the bottom so the siding tucks underneath . Rabbit should be about 3/4 x 3/4" so that two laps of siding ar able to fit under. If you choose this option 1 1/2 " material should be used .
Sub trim could also be used so your trim sits flat instead of being cocked by the window flange. What the manufature means by sub trim is if you are overlapping the trim over the siding,you will need somthing 1/2" for the trim to sit on as each lap of siding is 1/4" each
Have you used this method before? Using 1/2 plywood for sub trim?