See diagram 2e 4a.
How to trim out windows metal siding.
Brads for nailing to the jamb.
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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Attach the j trim along the line that will form the upper edge of the metal siding.
Changing out windows tricky with aluminum siding.
That way you can reuse miscuts for the smaller windows and not run out of material.
Install the trim by nail the longer side of the j to the framing lumber with the washer head metal siding nails.
To prevent splitting avoid nailing closer than 2 in.
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.
When nailing 3 4 in thick trim use 15 gauge 2 1 2 in.
Corrugated pvc siding is used on many garden sheds garages and patio enclosures.
Do not miter corner joints of band boards fascia corner trim etc.
Nails for the framing and 18 gauge 2 in.
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.
This is step 17 in a 24 step video series that shows you how to install.
To install a window you cut an opening and install framing to mount the window and trim the outer edges.