Window trim question

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Forum topic by DandD posted 02-18-2015 07:07 PM 932 views 0 times favorited 3 replies Add to Favorites Watch
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2 posts in 1975 days

02-18-2015 07:07 PM

Topic tags/keywords: question joining traditional

I have a question. I am trimming out a set of 8 windows in my living room and I am wondering if I should biscuit joint all the pieces together to have seamless joints as much as can be. I am tying all of the windows together to make a nice wow factor for the room. The problem i foresee is uneven walls. I am also staining/poly rather than painting. I have completed the interior trim on all eight windows and am trying to decide to joint or not to joint.

The span of the window area is 14’. SO, obviously there will be a lot of pieces. I have a 98 degree slope rise to the apex on each side.

3 replies so far

View Ghidrah's profile


667 posts in 2003 days

#1 posted 02-19-2015 12:02 AM

1st the extension jambs should always stand out from the wall by a 1/16 to 3/32” to account for uneven plaster, joint compound and wall paint. If the walls are really bad I’d suggest doing a mock up of the wind trim, set it in place and trace the outline. Use the outline to slice the offending areas then pare them down with sand paper and or drywall rasp. Not knowing what your trim is I can’t say, (sill, no sill, apron, no apron, Picture frame?) colonial and ranch are too thin to even take the chance trying it. If you’re adamant on assembling the trim for each prior to installation, glue and clamp with band or pinch. If sill, make a temp bottom that will help hold the top square for glue and clampage.

-- I meant to do that!

View mcase's profile


446 posts in 3910 days

#2 posted 02-19-2015 12:50 AM

I’m a bit confused – You have completed the interior trim on each window? Do you mean you trimmed the jambs before the side trim. Some trimming methods employ side-stop trim which covers the jamb and extends beyond the jamb to cover part of the side trim. This solves some of the problems you foresee because it hides the less than perfect the gap between the side trim and the jamb created by uneven walls In other words the window stop molding that trims the jambs goes on after the side molding. It is in fact the last piece of trim you install. If your using another trim method that resembles door trim and demands that the side trim meets perfectly with the walls and the jamb trim then it is a more difficult install. Gidrah says it all. Also all of Gildrah’s questions are relevant. But whatever method your using I would recommend a good book on interior trim and finish carpentry as the best place to start. Aside from all that and to answer your question on biscuits – if you don’t mind the extra work, and your molding is beefy enough to accept them, then biscuits will definitely help prevent the gaps that often show up as wood drys and moves. In fact on high-end work architects often specify biscuit joining of trim.

View runswithscissors's profile


3100 posts in 2806 days

#3 posted 02-19-2015 01:17 AM

Another possibility, if you mean to join pieces end to end, is to use finger joints made with appropriate router bits. Most mfgs. seem to offer one. Quite a bit stronger than biscuits for end joining.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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