I will soon be doing my first sill replacement in extremely tall windows that I definitely don’t want to replace. My local yard carries a fiberglass replacement sill that looks very similar to the ones on the house (1980’s). My only problem is I’m concerned about the repacements fitting properly. I don’t want to remove the old until I’m sure the new will fit and I can’t be sure the new will fit until I remove the old. Have those of you with experience in this area found the replacements to be a universal fit with no or slight modification? If not, what course of action would you reccommend? Any other tips you could provide will be greatly appreciated as always. Thanks.
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Cut a 1/4" piece out of old one and match profile to new.
Another approach is to use a piece of modeling clay. Cover the surface with plastic wrap or wax paper and press the clay into it. If you need to fit more than 180 degrees, use two pieces (one top, one bottom) with a piece of wax paper between so the two piece don't stick together.
So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin
Whenever I have a profile to match w/o removing the object, I cut a kerf into the object. Then I slide paper or cardboard into the kerf and trace the profile.
"May the forces of evil be confused on the way to your house." -George Carlin