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Insulation under mortar screed

Insulation under a conventional mortar screed consists of laying on the ground EPS or extruded polystyrene panels, insulators chosen according to the required performances then to make a screed intended to receive either a bonded floor covering or a sealing mortar for tiled floor coverings. This technique is also applicable for liquid-cooled heating / cooling floors or electric radiant floors. This type of thermal insulation also allows significant improvements in acoustic performance, so often undermined in collective housing.

Necessary material

  • Water and Bubble Levels
  • Meter and pencil
  • Rule
  • Cutter
  • Shovel
  • Rake
  • Trowel
  • Float

Steps

  1. Laying of the insulation on the ground
  2. Laying the mortar screed on the insulation

Laying of the insulation on the ground

Floor to isolate before laying the screed

Floor to isolate before laying the screed

1. Check with the big rule that the floor does not have irregularities of more than 7 mm or that it is necessary to incorporate before, pipes or conduits. In this case, perform a restoration. On a plank floor (without crawl space), place a polyane before laying and put it on the edge of the skirting boards.

Place a resilient tape around the bottom of the walls of the room

Place a resilient tape around the bottom of the walls of the room

2. Place a sufficiently wide resilient strip (thickness of the plates + thickness of the screed + safety margin) all around the bottom of the walls of the room, band that you will maintain by putting up the insulating plates. Take into account the jambs, the thresholds and any emergences (poles, pipe sleeves...) to separate the screed from the structure and limit the thermal bridges.

Arrange the polystyrene plates on the floor

Arrange the polystyrene plates on the floor

3. Place the first panel at an angle and continue laying by juxtaposing the EPS plates to their profiles (groove and tongue assembly). Being here on a floor of floor, the plates can be directly arranged on the floor.

Filling of irregular fittings of insulation

Filling of irregular fittings of insulation

4. On irregularly shaped areas, it is important to fill in all the connection gaps. Do not hesitate to perform these fillings with cut falls, since this level of soil will be completely covered.

Cleared site, ready for next step

Cleared site, ready for next step

5. Complete the installation of the insulation by making the cuts (the most precise possible) imposed by the various obstacles that may encounter this type of site. Make the surface clear before any other intervention.

Laying the mortar screed on the insulation

Laying Polyane and Reinforcing Mesh

Laying Polyane and Reinforcing Mesh

1. Place a polyane sheet over the entire surface of the piece, then the reinforcement to isolate and reinforce the screed. Make fairly wide cover joints (minimum 20 mm).

Spreading the mortar screed

Spreading the mortar screed

2. You are ready now to receive the mortar and distribute it regularly, covering the reinforcement of the agreed thickness according to the required performance. This step is easier to implement with the help of another person.

Spread mortar screed

Spread mortar screed

3. The rest of the operation, once all the mortar has been spread out, consists in making the draft of the screed and its finishing in the rules of the art of the profession.

(photos / visuals: © Afipeb, except special mention)

Insulation under mortar screed: insulation

On the same topic

  • Questions answers
    • How to redo and isolate a ground floor?
    • How to isolate the floor of a house on crawl space inaccessible?
    • How to insulate cold tiled floor?
    • Can we pour a screed on an existing slab?
    • How to make a screed on a concrete support?
  • DIY tips
    • Panel floor on dry screed
    • Insulating concrete slab and screed

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