Method 1: Hold it in the opening with shims underneith and verify directly.
There must be a reason that is difficult or I think you would have done that
already.

Method 2: Careful measureing. Check the diagonals to verify it is square

Method 3: Make a template out of cardboard. This seems like overkill IMO
and if you don't have a big box to get rid of, might even cost more than the
door did.

Method 4: Lay the old door on top of the new one and match it up. Seems
easy, cheap and reliable.

You can probably plane some off if it is a bit too big or if the frame is
funny but if it is too small you are out of luck. Hopefully this wasn't
already done to extremes.

Even a new replacement door would require almost as much work as your
putting into this one. (the handle would be easier)

You lost me with the 45 deg angle to the floor reference.

You can still use the hollow door, you just need to glue in some blocking
around the cutout, the trim on the cat door will cover the rest.


wrote in message
ups.com...
I want to replace an odd-sized lauan door leading to our cellar with a
used but solid wood door I got at a Habitat for Humanity store. I have
a cat who likes to go outside in warm weather, and I'm getting too old
to stay up all night with her , so I thought I'd build a "cat door."

The odd-sized original door is 1 1/4" thick, 29 3/4" wide, and
approximately 80" tall. I chose the $5.00 wooden door because its
width matches the lauan door exactly. However, it's only 1 1/8" thick,
74" tall, and has hinge placements and sizes in different areas than
the lauan.

I filled in the hinge areas with very thin panel board and can chisel
out new areas. What I'm concerned about, however, is possibly doing
all this work only to find the door out-of-level or (since it's
panelled) unable to be hung with the mullion and stiles at 45 degree
angles to the floor. The door has ancient skeleton key holes and needs
to be puttied and painted, and I don't want to waste putty or paint, or
TIME! on something that won't work.

So I just thought I'd ask if there are any tips for knowing in advance
if a particular replacement door will work in the area you need it.
Thank you.