Flat roof
Warm roof
A "warm roof" is a flat roof in which all roof layers are bonded together. Its defining feature is that the waterproofing lies above the Austrotherm insulation layer.
Recommended products
We recommend our harder grades of standard "white" EPS:
EPS / EPS PLUSAustrotherm EPS A100
Thermal insulation board of expanded polystyrene (EPS)
- λ
- 0.035 W/mK
- Compressive strength
- 100 kPa
- Permitted load (2%)
- 20 kPa
- Fire class
- E
EPS / EPS PLUSAustrotherm EPS A120
Thermal insulation board of expanded polystyrene (EPS)
- λ
- 0.034 W/mK
- Compressive strength
- 120 kPa
- Permitted load (2%)
- 30 kPa
- Fire class
- E
EPS / EPS PLUSAustrotherm EPS A150
Thermal insulation board of expanded polystyrene (EPS)
- λ
- 0.033 W/mK
- Compressive strength
- 150 kPa
- Permitted load (2%)
- 40 kPa
- Fire class
- E
Austrotherm EPS on trapezoidal metal sheeting
- 1protective surface layer (gravel, concrete slabs etc.)
- 2waterproofing
- 3Austrotherm EPS A120 (for example)
- 4vapour barrier
- 5trapezoidal metal sheeting
Austrotherm EPS in a green roof
- 1walkable top layer (e.g. concrete slabs)
- 2filter fleece
- 3drainage layer (e.g. Austrotherm EPS A30*)
- 4waterproofing
- 5Austrotherm EPS A120 (for example)
- 6vapour barrier / levelling layer
- 7reinforced concrete slab
* This application refers to use outside the Republic of Serbia, where the board is considered a construction product.
| Austrotherm EPS A100 | Austrotherm EPS A120 | Austrotherm EPS A150 | |
|---|---|---|---|
| Application: | insulation under mechanical load | insulation under higher mechanical load | insulation under very high mechanical load |
| Load: | non-walkable flat roofs | flat roofs – walkable, green, with vehicle traffic | flat roofs – walkable, green, with vehicle traffic |
| Thermal conductivity λd: | 0.038 (W/mK) | 0.036 (W/mK) | 0.034 (W/mK) |
| Permitted compressive load: | 20 kPa (2 t/m²) | 30 kPa (2 t/m²) | 40 kPa (2 t/m²) |
| Insulation thickness needed for U(k) = 0.15 W/m²K: | 200 mm | 200 mm | 190 mm |
| Insulation thickness needed for low-energy buildings, U(k) = 0.10 W/m²K: | 300 mm | 290 mm | 280 mm |
Insulation advisor
Describe the job — get the right boards
Tell us what you are insulating and with what. The advisor picks from Austrotherm products only and quotes our own data; the site then works out the packs.
- Describe the building element and the situation
- Get the element, the boards and the open questions
- Calculate packs and the indicative thickness
Indicative calculation
How many packs?
Packs from our own packing lists: area ÷ m² per pack, rounded up. With a target U-value the calculator shows the indicative insulation thickness d = λ × R.
Enter the area to see the number of packs.
Indicative only — the final choice and thickness are confirmed by your designer or Austrotherm technical support. The thickness estimate takes the insulation layer alone (R = 1/U) and does not check any regulation.
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Private customers and contractors
We sell wholesale only. Our products are on sale at hundreds of building-material dealers in Serbia and Montenegro.
Building-material dealers
Registered companies order directly from us — with the order form and the current price list.