Forum Title: Trim for aluminum windows
Hi, I'm a little puzzled by the final steps in an instruction pamphlet for installation of Jeld-Wen aluminum windows. I'm trying to figure out why I would want a 3/8 gap (see below, copied from the instructions) between the window and the siding, and how the exterior trim is installed to seal and hide this gap. I haven't installed windows before. The rest of the house has 2x2 cedar trim around the windows. I'm a little uncomfortable with hoping it'll all make sense as I do the installation and would like to understand how this works before starting. The windows have a slip-on nailing fin on the inside and another lip or fin on the exterior side of a j-channel. Should the trim cover this exterior fin? The full instruction sheet is at JELD-WEN Windows and Doors | Installation and Finishing (New construction aluminum windows (pdf)). Thanks! Steve From Jeld-Wen website at JELD-WEN Windows and Doors | Installation and Finishing (New construction aluminum windows (pdf)). AFTER INSTALLATION 4. Install exterior wall surface within seven days of window installation. 5. Maintain gap of 1/4-3/8 between window frame and fi nal exterior wall surface (siding, stucco, etc.). 6. Seal this gap on the sides and under the window sill with backer rod and sealant. Do not apply sealant on top of the drip cap 7. On the interior, insulate the void between the rough opening and the window frame with loose-fill fiberglass insulation. Do not use high-expansion foam.
Category: Windows & Doors Post By: SANDRA MOORE (Naperville, IL), 01/29/2019

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