Attach the j trim along the line that will form the upper edge of the metal siding.
How to trim out windows metal siding.
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Install the trim by nail the longer side of the j to the framing lumber with the washer head metal siding nails.
This is step 17 in a 24 step video series that shows you how to install.
Trim out the biggest windows first.
When nailing 3 4 in thick trim use 15 gauge 2 1 2 in.
Do not miter corner joints of band boards fascia corner trim etc.
To prevent splitting avoid nailing closer than 2 in.
Provide increased spacing along the trim if specified by the siding application instructions.
See diagram 2e 4a.
The metal siding will slide into the j trim so install the channel with the opening of the j facing the direction of the siding.
Where edges of trim meet siding material windows doors or other finished openings leave a minimum 3 16 inch 5 mm space to allow for proper sealing.
The third option is to cut between the side of the window frame and the edge of the siding with a metal cutting.
That way you can reuse miscuts for the smaller windows and not run out of material.
Nails for the framing and 18 gauge 2 in.
Changing out windows tricky with aluminum siding.
Trim around the new window.
Brads for nailing to the jamb.