How to install a cornice on a laminated plaster ceiling 2026

Learn how to install a cornice on a laminated plaster ceiling in an easy and practical way with the following tutorial that we leave you.

Due to their light weight and easy installation, polystyrene cornices are very suitable for decorating a laminated plasterboard ceiling. That is why today we bring you an excellent job done by our colleagues at hogarmanía teaching us how to do this lightning work using the precise technique of every expert.

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Procedure of how to install a cornice on a laminated plaster ceiling:

Step #1

The first thing we will do is measure the length and width of the room, to calculate the amount of material we will need. We advise you to buy some more strips, since some material is lost in miter cuts.

Step #2

Next, we go over the surface on which we are going to work with a brush so that it is very clean.

Step #3

To align the moldings correctly, we will mark the exact points around the perimeter of the room.

Step #4

We place the cornice next to the angle of the corner that we want to cut and we mark the line that will serve as a guide to know the inclination of the cut that we will have to make.

Step #5

We place the cornice in the miter box so that the side of the piece that has to touch the ceiling rests on the base of the box. With the hand saw for metal we will carry out the task slowly, so that we get clean cuts.

Step #6

We present the piece on the ceiling again and mark the angle that we will give to avoid the corner.

Step #7

Using the metal hand saw and the miter box, we cut it.

Step #8

We apply mounting adhesive on the moldings; As this product does not contain solvents it will not damage the polystyrene. We will apply the adhesive on the faces that go to the ceiling and the wall, as well as in the joining areas between pieces.

Step #9

Later, we will complete the remaining sections of the roof, perfectly adjusting the bevel joints; This type of joint is better hidden than those cut at right angles, since they overlap.

Step #10

We will cover the joints with a flexible filling paste, which does not shrink or crack, and let it dry before finishing the job.

An explanatory video on how to install a molding.

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