I'm in the process of replacing windows in my house. Two weekends ago I replaced a larger unit with a half round top. I now need to make the interior trim and get it installed this weekend. I've got multiple questions for those out there that have done this.
My plan is to do a segmented glue-up but I'm not sure what is best from a structural and cosmetic standpoint. Should I put a seam on the top center or would I be better spanning this with a board and place the seams at the 10:00 and 2:00 positions (see picture for example of what I'm asking)? I'm also wondering if there is a rule of thumb for how wide of boards I should use for the glue up as the old one I removed had split on both sides where there was cross grain as they had used some very wide boards to glue together the arch. I'm not against doing a glued up bent lamination but that seems like overkill for household trim.
Arch.png
If anyone knows of an online calculator to use to calculate angles and lengths for gluing together an arch, please post a link as I've been unable to find one so far in my searches.
Just for information I will be using a William & Hussey molder to run the arch with a standard 2-1/4" width casing profile.
Casing.JPG
Thanks in advance,
Wes Billups