How are the cornices installed?
Cornices are first cut to length in a mitre box then glued with a plaster adhesive compound called Cornice Cement. If they are a large profile or are being installed onto a painted surface they may also require fixing screws through the cornice into the timber batons above the ceiling. It is best to use a qualified Fibrous Plasterer for this job as cutting & joining the miters & pattern matching can be complicated.