When making longitudinal cuts score with a knife and break along the score line.
Cutting hole in vinyl siding.
A clean way to cut vinyl siding is to score it with a utility knife and then bend the vinyl at the score.
Cut a scrap piece of siding to a length that is several inches longer than the hole.
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Fit a circular saw with a fine toothed plywood cutting blade.
A hole saw tin snips etc will slice right through it.
The best way to cut vinyl siding circular saw.
For the smoothest cuts put the blade in.
That said the hole is the least of your effort.
Use tin snips or a rotary tool to make curved cuts.
Cutting the vinyl siding is easy.
It should snap apart.
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You can also use tin snips to make crosscuts.
When we cut with a circular saw we often install the blade backwards to minimize ripping and tearing of the vinyl.
Place a strip of siding on the work table and align the place you plan to cut it with the edge of the table.