Is there a way to cover a large crack in the sheet rock across sunroom

I would first be concerned with WHY it is cracked, and if there is something going on structurally, see to that ASAP. As for the crack, depending on how severe it is, it can either be covered with tape and compound or you may have to patch in a new piece.

Use fibreglass drywall tape to cover the crack, then with a trowel squish drywall compound onto the tape. Allow to dry, repeat if necessary (the compound will shrink) once filled completely, sand down the compound to be flush with the rest of the wall. Paint.

need to find out why it 'cracked' -- or if the seam came apart --- but Sheetrock tape/mud/sand and paint -- but this would only be a cosmetic fix -- not the underlying problem. It might be better to remove that one sheet and replace.

One choice is to remove any seam tape add new drywall mud and retape the seam. Apply several coats then sand to finish before Painting. Another choice is create a board and batten look on the wall or all walls in the room. Using inexpensive 1 x 2 boards cut to fit and carry pattern around the room. Adhere with finishing nails and liquid nails fill any nail holes before painting. Photo to get you started. Hope the helps

If its a wide (not just long) crack you may want to have someone check your foundation. Cracks are common, but if it is wide enough to put a coin in that might indicate a more serious issue

contact paper

Hi Suzy. You can repair the crack. First you need to scrap the crack to make sure all of the loose material is off. Then I use drywall compound and drywall tape. You put the compound on with a larger putty knife made for drywall and then put the tape over it so it sticks. Make sure there aren't any bubbles and that the tape has the compound behind it completely. Otherwise you will have the tape sticking out once finished. Then you take the compound and put a coat over the tape so it starts to blend with the rest of the ceiling. Let it dry and sand to smooth and blend. When I did this I had to do a few coats and sanding so it completely blended. After it is all done prime and paint. The sanding does create a lot of dust. I have read that some people take a damp sponge before the compound dries to get it to blend in with the rest of the ceiling. I never tried it but it is supposed to work. Good Luck!

This article should help you get started! https://www.diynetwork.com/how-to/rooms-and-spaces/walls-and-ceilings/how-to-repair-cracks-and-holes-in-drywall