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Styrofoam slabs on the ceiling

Sticking polystyrene slabs to a ceiling is a simple operation, except for contortions related to any ceiling work.
As is done for laying carpet tiles on the ground, it is first necessary to draw the two axes of the room, starting from the center of the ceiling.
Also make sure to choose an adhesive compatible with expanded polystyrene. For example, do not use Neoprene glue that attacks and dissolves this material.

Necessary material

  • Brush to brush or broom
  • Polystyrene adhesive
  • Powder cord
  • Plasterer's knife
  • Cutter
  • Mesureing tape
  • Flat metal ruler
  • Spatula


  1. Prepare the ceiling and slabs
  2. Lay the tiles glued to the ceiling

Prepare the ceiling and slabs

Dusting with the brush to rub.

Dusting with a brush

1. The slabs should not be considered as "miseries". Therefore, the ceiling must be cleared of any coating that sticks badly: old paint, wallpaper, plaster...
Then dust off the ceiling with a broom or brush to rub the wallpapers. Once these operations are completed, bring a string to determine the center of the ceiling.

Position control of the ceiling slab.

Position control of the ceiling slab

2. The first slab should be placed by aligning its upper left corner with the angle of the two axes.
Position each slab before gluing. Make sure during this check that each slab is quadrangular. Eliminate those that are not, keep them nevertheless for cutting areas.

Application of glue points.

Application of glue points

3. It is essential to work with a special glue, suitable for expanded polystyrene.
In order for the slab to rest on its entire surface, apply a small amount of glue to the center of the plate as well as in each corner.
If the adhesion is instantaneous, it takes 48 hours for the bonding to be final.
In the case of a raw concrete ceiling, it is first necessary to apply a universal base fixer.

Lay the tiles glued to the ceiling

Placement of a glued slab.

Placement of a glued slab

1. Once the tile is glued, it must be laid quickly, or a film of glue will form and damage the adhesion.
Position the slab in its final location, but without squeezing it for the moment. To avoid fingerprints, use a clean cloth or piece of slab to press under each point of glue.
Begin by pressing at the level of each pad at the corner of the two lines. Finish with the central stud and the one on the opposite corner.

Cutting end slabs.

Cutting end slabs

2. Move to the next slab, adjusting it following the previous one. First compress the pads closest to the newly laid slabs.
When the ceiling is almost completely covered, it remains to treat the peripheral slabs that most often require cutting. This is where slabs with defects can sometimes be reused.
For each of them, measure the remaining space and postpone the rating obtained on the back of each slab. Then, cut the slab with a cutter with the help of a metal ruler.

Recessing the last pieces of slab.

Recessing the last pieces of slab

3. Put in place and glue these pieces of slabs, cut side towards the wall.
Slowly rub the pieces of slab along the entire length of the room.

(photos / visuals: © DIY-Prod, except special mention)

On the same topic

  • Questions answers
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    • How to perform a dubbing in a buried room?
    • How to solve the problem of a ceiling that crack?
  • DIY tips
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    • Molding and rosette
    • Install a false storage ceiling
    • Suspended ceiling with clips
    • Insulated ceiling made of plasterboard
    • Fix a false ceiling in removable slabs
    • Line a ceiling with paint paper or polystyrene

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