Austrotherm EPS – elementi za krovni nagib

Depending on the chosen solution, the type of flat roof and the insulation materials planned, the slope of the roof surfaces (by the definition of a "flat roof" in the Austrian standard B 7220) ranges from 1% to 22%. In practice a fall of up to 5% is most common. Architects, designers and contractors are the main groups we address with our tapered EPS boards.

The fall (slope layer) is an essential part of every flat roof. In the past it was usually made as a layer of cement screed, lightweight concrete or concrete, placed either on the structure or on the insulation (below the finish). The main drawback of these materials is that it is a "wet" process that needs drying time. It also needs machinery (which adds cost), the work depends on the weather (water and moisture from rain can stay in the structure and evaporate for a long time), and installation errors are likely.

As building materials improve, so do building methods: on the European market Austrotherm already offers (and will soon offer in Serbia too) a "two in one" principle — insulation that is at the same time the fall layer of the flat roof!

The EPS boards are cut to order for each flat-roof plan — both for the designed insulation thickness and for the slope. After the vapour barrier has been laid on the reinforced concrete slab, to keep vapour and moisture out of the insulation, the insulation is installed. The two hardest Austrotherm EPS grades are used for this: Austrotherm EPS® 120 and Austrotherm EPS® A150; which one depends on the design load. The boards are laid in two levels: the lower level of standard flat boards (rectangular section), the upper level of tapered boards (trapezoidal section). The thickness of the flat boards in the lower level is set for each building according to the required minimum insulation thickness. The slope of the upper boards follows the specified fall, i.e. the geometry of the roof and the exact positions of all outlets. Standard sizes of the tapered boards: 500 mm x 1000 mm, 1000 mm x 1000 mm and 1000 mm x 1250 mm. Alternatively, Austrotherm XPS® 30 can be used in the lower level instead of standard EPS boards — a more expensive option with all the known advantages of our pink boards. A geotextile is laid over the insulation, then gravel ballast, or a waterproofing membrane (PVC or EPDM).