just looking for a little reassurance really – decorating the hallway in a house we have recently moved in to, The plaster coving has been done very poorly – very uneven, very visible joins etc. I was in 2 minds whether to remove and replace but knew if I didn't it would annoy me. The coving is plaster, I will replace with the polystyrene coving. As i started removing the coving there is quite a large gap between the sheet plaster on the wall and the sheet plaster on the ceiling – like an inch or so. I kind of expected the two to meet. There's no danger that the coving was helping support the roof sheets and by removing the coving I risk the roof sheets dropping?
Drywall – Did the cove molding that I’m removing support the drywall panels behind it
drywall
Related Solutions
Go ahead and place the drywall over the top edge of the crown moulding. Sounds like the wall was already re-plastered with it in place. If you tried to remove it, you may end up re-doing the walls as well. Even forgetting that, it's almost impossible to remove moulding without sustaining some loss. Without replacement material available, removal with intents of preservation is extremely risky, especially with stain grade material. You don't want to go there.
If your joists were flat, you'd still only need to shim down the first 4 feet or so along the walls, no one will see the resulting slight slope. Keep this in mind when planning your shims. It doesn't have to be perfectly flat, unless that gives you pleasure. You also don't need to shim to completely fill the gap. An 1/8" gap makes a clean shadow line that is not detrimental (assuming it is perfectly uniform) at all. It also makes finishing easier. The taped joints of drywall are normally not perfectly flat, despite the tapered edges. There is a slight bulge which is usually invisible. But against straight moulding, depending on the profile, this bulge may be visible. You might consider grinding down the edge tapers at the board corners against the wall so the joint tape can be completely buried and the yet the joint against the moulding can still be perfectly flat.
If you really want to securely hold objects that heavy to the wall using magnets, I think you need to be working with sheet metal on top of the drywall (or in place of the drywall).
The magnetic force will fall off very quickly with distance away from the plate, so even skim-coating with plaster will dramatically reduce the holding power of the magnet.
If you want the surface to blend in with the surrounding walls (you didn't actually state the finish on the walls, but I'm assuming it's painted sheetrock or plaster), try simply painting the steel sheet to match. The texture of the finish might be slightly different, but I'd imagine it wouldn't take away from the feeling that it "blends in" with the surrounding walls.
As others have stated, I'd also consider a polycarbonate mirror rather than glass.
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Best Answer
No, the decorative cove molding is not supporting your drywall sheets. They'll be securely fastened with nails or screws.