Messages and Online Forum Q&A

Re: Adding Foam Board Insulation and Effect on Window Trim

From: clpikley@yahoo.com
Category: Wallboard/Veneer Plaster
Remote Name: 70.105.9.231
Date: 20 Feb 2006
Time: 02:29 PM

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Question: I have a split-level home. The lower level has cinderblock walls behind the paneling. I want to remove the paneling, add foam board insulation, and then drywall. I know I need to remove the window trim but when I put it back, how will it be effected by the additional wall thickness? I cannot seem to envision how the additional thickness around the windows will effect the look. I don't want to start the project until I can work through this issue.

Builders Websource® Answer: If your existing windows have wood frames on the inside,  you can purchase standard jamb extensions tto extend the jamb flush with the new finish surface. Jamb extensions come in a few different widths typically optimized for 2x4 and 2x6 construction. As a result, you may need to rip these to a precise width using a table saw and a quality finish carpentry blade. You can drill small pilot holes in the jamb extensions and use finishing screws or a pneumatic nailer to anchor them to the existing window frames. If your windows are vinyl, fiberglass, or aluminum framed, you have a couple of choices. You could build wooden jambs to frame out a box and finish it off with casement molding that overlaps the drywall and window jamb, leaving about a 1/4" offset between the inner edge of the jamb and the edge of the casement trim. Or, depending on the style of the house, you can frame out the jamb with drywall, using either bullnose (rounded) or square corner beads. Bullnose corner beads look nice on Mediterranean-style or country-style homes, whereas square corner beads provide a more traditional look. You may need to use construction adhesive to secure the drywall to the window opening, particularly if there is no suitable wood framing substrate.

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