What’s the best way to trim out casement windows when standard trim doesn’t fit in the dormer?
Asked by Perpétuo Nogueira 
7 months ago
Last Updated: May 15, 2024
Thanks for including me in the group. I’m having trouble figuring out how to trim these casement windows. The regular trim just doesn’t work in the dormer. I have a few ideas, but I’m still working on it.
You can either buy longer extension jams or try making them yourself.
I think you should purchase a piece of MDF and trim it to fit.
Spend a couple hours at a big store looking for the only two pieces of straight “white wood” available, then cut to size for the window frame. Next, add trim that matches your home decor. You might need to cut the trim to fit around the window closely.
That’s the main issue I’m facing. The space between the window and the wall is really small. There’s no way to find something that matches the current trim. That’s fine.
Once you extend the jamb, you’ll know the exact width you have to work with. Matching trim might look great, or it might look silly and you might prefer a plain board instead. It all depends on the trim style of the rest of the house.
I’m not sure where you’re at, but you might want to check out Home Depot for primed finger-jointed boards that come in different widths, perfect for casing, trim, and window sills. Maybe you can find something similar nearby
Yep. I have 2 Lowes stores and a Home Depot nearby. I’ll be spending some time at one of those.
You should definitely get rid of that insulation and use foam to seal up those gaps. Air goes right through insulation.
Start by installing the extension jambs before adding the trim around it
Make sure to align the extension jambs with the Sheetrock, insulate, and cut the trim to the right size
If it were me, I would use a 5/4 sill for the bottom and create a frame around the rest using shimmed 1x boards. Finish by adding trim to your preference. Cut the regular casing and miter it with a piece for the sill.
Using a table saw makes this project easy, just make sure to remove the pink material and use low expansion foam first. Let it dry before cutting. One person suggested using MDF.
Thanks to all of you for the support. Ever since we got those new windows, this room has been a bit of a mess. Putting in a new floor and baseboard became a top priority.