baltimore wrote:

I have a project that involves substantially shortening solid exterior
doors by about 90mm (from the bottom). The doors are Jen weld Windsor
win21 with a single glass panel. My question is, can I comfortably cut
that amount from the bottom of the door and still retain integrity?
These doors are to be used as bi folds.

If it's a solid-core door, you can pretty much cut off as much as you
want with not problem.

If it's a hollow-core door, you'll probably cut off the whole solid
piece that reinforces the bottom edge, leaving skins and insulation.
You can then peel the skins off the solid piece, then glue it inside
the new bottom.

--
Steve B
New Life Home Improvement
Arlington, TX USA