That way you can reuse miscuts for the smaller windows and not run out of material.
How to trim out windows metal siding.
Changing out windows tricky with aluminum siding.
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.
Provide increased spacing along the trim if specified by the siding application instructions.
See diagram 2e 4a.
Do not miter corner joints of band boards fascia corner trim etc.
Trim out the biggest windows first.
To prevent splitting avoid nailing closer than 2 in.
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Nails for the framing and 18 gauge 2 in.
Install the trim by nail the longer side of the j to the framing lumber with the washer head metal siding nails.
Brads for nailing to the jamb.
Attach the j trim along the line that will form the upper edge of the metal siding.
When nailing 3 4 in thick trim use 15 gauge 2 1 2 in.
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.
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Trim around the new window.
The third option is to cut between the side of the window frame and the edge of the siding with a metal cutting.