The insulating formwork slab combines prefabricated joists and expanded polystyrene infill blocks. Light, it is laid without lifting equipment: the compression slab and the joists are poured in a single operation.
The benefits
- Insulation built into the floor and reduced thermal bridges
- Manufactured and delivered to the length required
- Clear span of 8 m and more, load up to 600 kg/m² and more (subject to study)
- Laying plans and strength calculations carried out by the manufacturer to the standards in force
- False ceilings, ducts and lighting are easy to fix
Where to use it?
- Upper-floor slab: better temperature management per level, possible separation of day and night areas
- Crawl-space slab: thermal barrier, particularly suited to clay or flood-prone ground and seismic zones
- Roof-terrace slab: continuous insulation of walls and parapets, a solution for green roofs
- Intermediate slab: adjustable false-ceiling height
Standard range (housing with compression slab)
| Clear span | Total infill height | Thermal resistance | Heat loss (U) |
|---|---|---|---|
| 0 to 4.80 m | 17 + 4 = 21 cm | 2.86 m².K/W | 0.304 W/m².K |
| 4.80 to 5.50 m | 17 + 8 = 25 cm | 2.99 m².K/W | 0.287 W/m².K |
| 5.50 to 6.20 m | 17 + 10 = 27 cm | 3.07 m².K/W | 0.275 W/m².K |
Thermideck range: four performance levels
| Level | Thermal resistance (4.50 m span) | Heat loss (U) | Total thickness |
|---|---|---|---|
| Standard | 2.60 m².K/W | 0.38 W/m².K | 17 cm |
| Higher (Thermideck 6) | 5.70 m².K/W | 0.17 W/m².K | 27 cm |
| Passive (Thermideck 7) | 6.95 m².K/W | 0.14 W/m².K | 31 cm |
| Passive + (Thermideck 9) | 9.45 m².K/W | 0.10 W/m².K | 39 cm |
Points to check
- The clear span between load-bearing or internal walls
- Permanent loads: floor covering, partitions, staircase, chimney, hot tub…
- Climatic loads and waterproofing for a roof terrace
- Openings and propping, defined on the laying plan
Does the manufacturer carry out the calculations?
Yes, it states that it produces the laying plans and strength calculations free of charge, to the standards in force, from your project data.
Is it suitable for a renovation?
The manufacturer presents it as suitable for floors in new builds or renovations. Feasibility depends on the existing structure.
Discover the other uses of the system
- WallsInsulating concrete formwork blocks
- RoofSelf-supporting insulating panels
- Swimming poolsInsulating blocks for the pool basin
- Passive houseComponent certified by the Passive House Institute
Values and performance come from the manufacturer’s documentation. They depend on the site configuration and are confirmed by the study of your project.
Let’s talk about your project
New build, extension, swimming pool or heavy renovation: an adviser studies your project with you and checks whether this process is suitable. No automatic price.