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Expanded polystyrene composite panels allow the thermal insulation of floors on high basements (garage, cellar...), open passages and accessible crawl spaces.

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These panels are composed of a block of expanded polystyrene sandwiched by two plates of wood wool.

The installation of these panels is feasible according to two techniques:

1 / directly by mechanical fixing (screws, nails...) in the ceiling when it is:
good plan (concrete slab, hollow-core slab, beamed floors with interlocking concrete or ceramic),
thick,
without electrical conduits and without pipes.

2 / either on rails that you have previously fixed to the ceiling in all other cases.

In both cases, make sure that no floor heating or cooling is present in the floor located above the ceiling.

Difficulty level: Way

Technique n° 1: direct fixing in the ceiling

Tools and materials needed:
Composite panels,
A screwdriver drill,
A hammer,
Stays,
Planks
A hacksaw or thievesaw,
One meter,
A grinder or sander,
A chalk line,
Nails,
Screws,
Mechanical anchors,
A stepladder,
Protective glasses.

Step 1: Prepare the media

Start by checking that your support is perfectly healthy, clean and clean.
If the support is not level, it will then be deburred with a sander or a grinder without forgetting to protect the eyes with glasses.
Once the deburring is done, dust off the whole thing.

Step 2: Lay the panels.

Install the first panel against one of the corners of the room and hold it in place with a strut associated with planks to avoid damaging the panel.

Insulation of a ceiling with expanded polystyrene composite panels

Drill your panel at least 2 cm from its edges, following the manufacturer's instructions, then fix the panel to the ceiling using mechanical anchors. Allow about eight pegs per square meter.
Then do the same for the other panels, positioning them edge to edge, joints tight and staggered.

Storing Expanded Polystyrene Composite Panels

Step 3: Make cuts.

If necessary, make a cut for any ducts and other pipes with a hole saw or thievesaw.

Cut out expanded polystyrene composite panels

Finally, if a flue passes through the ceiling, you will have around a reserve of about 16 cm, which you fill with cement mortar.

Insulation of a ceiling with expanded polystyrene composite panels

Step 4: the finishes

Several finishes can be considered. The panels can remain rough or receive a coating or paint. You choose!

Technique n° 2: fixing on rails laid before the ceiling

Tools and materials needed:
Composite panels,
A screwdriver drill,
A hammer,
Stays,
Planks
A hacksaw or thievesaw,
One meter,
A plasterer's rule
A grinder or sander,
A chalk line,
Nails,
Screws,
Wooden wedges,
Rails or frames in wood or metal
A stepladder,
Protective glasses.

Step 1: Prepare the media

Start by checking that your support is perfectly healthy, clean and clean.
If the support is not level, it will then be deburred with a sander or a grinder without forgetting to protect the eyes with glasses.
Once the deburring is done, dust off the whole thing.
Using a chalk line and mason ruler, draw the location of the rails on the ceiling.

Step 2: Fix the frame.

Following your markings, nail, screw or anchor the rails into the ceiling as directed by your supplier.

Check that the frame is level with a spirit level. Place shims if necessary.

Insulation of a ceiling with expanded polystyrene composite panels

Step 3: Install the panels.

Install the first panel against one of the corners of the room and hold it in place with a strut associated with planks to avoid damaging the panel.
Drill your panel to fix it to the rail following the manufacturer's instructions. Provide 3 screws or 3 dowels per rail, installing these fixings at least 2 cm from the edges.

Storing Expanded Polystyrene Composite Panels

Then do the same for the other panels by positioning them edge to edge, joints tight, offset and perpendicular to the rail.

Storing Expanded Polystyrene Composite Panels

Step 4: Make cuts.

If necessary, make a cut for any ducts and other pipes with a hole saw or thievesaw.

Cut out expanded polystyrene composite panels


Finally, if a flue passes through the ceiling, you will have around a reserve of about 16 cm, which you fill with cement mortar.

Insulation of a ceiling with expanded polystyrene composite panels

Step 5: make the finishes

Several finishes can be considered. The panels can remain rough or receive a coating or paint. You choose!


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