The actual dimensions of the door are 30-1/4 x 22-1/4 and is designed for rough openings of 30-1/2 x 22-1/2
Hi Ed, The regular R-50 EZ Hatch will not work in a vertical application. However, the Deluxe (locking) R-50 EZ Hatch will work in a vertical application.
There is a lightweight hard-foam the is part of the access hatch. This insulates effectively. The entire system is sturdy, as long as you fasten it securely to the attic beams. There are no joints at the corners, the molding that you see is one continuous surface. As to specifically, how heavy the Access Door is, it is not heavy to work with. Given enough strength to place spacers, fasten clamps and drive screws with a power drill. With only one person doing the install, it is more difficult to get the panel up to the ceiling opening. It has been a couple of years since I installed the hatch, perhaps 20 lbs?
The rough opening dimensions are correct and the overall height is about 14 inches that protrudes into the attic.
The E-Z Hatch access door is unrated and meets IRC and IECC Code requirements. Check with your local Code official for acceptance if your project requires a rated door. It may be acceptable to add layer of sheetrock to the door face.