A ceiling rose that cracks the plaster is usually the plate
I noticed a star of cracks around the sitting-room pendant in April, after I hung a slightly heavier shade. The fitting sat a fraction lower than the ceiling. I thought the plaster had just aged. I isolated as far as I know how, and I stopped there because I was not sure the circuit was dead. Later, with the room properly isolated and a person who could confirm it, we took the cover off. The plate was held by two screws in plaster. There was no pattress. There was no joist. The shade had been hanging on a crust.
A ceiling rose plate spreads the load of the fitting into something that can take a screw. That something is a joist, or a pattress, a block or a proper box fixed to the joist. Plaster is a skin. Screws in a skin pull. The plaster stars, the fitting drops a little, and every extra bit of shade makes it worse. People fill the cracks and put the same screws back. The cracks come back.
I will not write a rewire. I will not write live work. If you cannot isolate the circuit and be sure it is dead, stop. Leave the fitting. The kit can wait. If the box wriggles in plaster and you cannot see a sound fixing into timber, stop again. That is not a filler job. That is a loose box, and it needs someone who can put a pattress or a joist fixing in. I am writing about the plate and the screws, not about cables.
When I can look, I look at the plate. Is it sitting flat? Are the screw holes torn? Is there a timber or a box behind, or only a hole in the plaster? A fingertip in a void with no wood is the whole diagnosis. I do not lengthen the screws and hope. Longer screws in the same plaster are a bigger tear.
Filler that shrinks is usually the deep hole is what I do with the cracks once the plate is actually held. Layers, not one plug around a fitting that still moves. If the plate still rocks, I do not fill. Filling a moving crack is a dish with a pendant in it. A radiator that wrecks a wall is usually the one you painted around is the same habit on a different obstacle. Painting around a dropped rose, or filling around it, leaves a halo you will see every time the light is on.
Skip a heavy glass shade on a plate you already know is in plaster only. Skip rawl plugs in a ceiling crust. Skip a bigger decorative rose as a cover for the star. The cover hides the crack and adds weight. Skip taking the fitting down if you have not isolated. If you cannot isolate, you do not take it down.
UK year is mostly when you notice. Spring cleaning, a new shade, or a room you paint in May. I would rather sort the plate in the off season, with time, than on a dark afternoon in November with the only light in the room on that pendant.
A small, light shade on a plate that is truly into timber is a different story. The plate still needs to sit flat and the screws still need to bite. I check that before I buy a shade, not after the plaster has a map.
I do not need a new pendant because the ceiling cracked. I need the plate on a pattress or a joist, cracks filled after it holds, and a stop if the box is only in plaster.
If I later add a buy link here, it will be a paid promo.