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Unread 10-04-2017, 06:56 AM   #12
Carbidetooth's Avatar
Join Date: Mar 2010
Location: Boise, ID
Posts: 1,472
I drew the radii on illustration to bisect the grout lines on the jamb.

Assuming you're OK with that skinny keystone and you want grout joints to align with jamb, tape your template to the wall and pencil along the inside radius and mark where your grout joints are. From there you can do the rest on a table with a straight edge and "compass" which could be a string or trammel.

Silicone (not silicon) Sealant Ranger

Last edited by Carbidetooth; 10-04-2017 at 07:24 AM.
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