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Rostwerk foundation

U-shaped EPS formwork is used for the construction of rostwerk foundation.

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This type of foundations are commonly used when unstable and weakly bearing soils go to a sufficiently large depth. These are karst, forest, peat soils, quicksand, plant and fertile soils of great thickness (more than 1.4-1.5 meters). Also, this is an option in permafrost or clay soil as well as in areas with large differences in elevation. U-shaped EPS is a two in one solution – it is a precisely dimensioned formwork for reinforced concrete, which also performs as the thermal insulation of a new foundation. This system allows to insulate rostwerk not only from the sides, but from the bottom as well. Moreover, it reduces construction time by eliminating the assembly of the formwork as well as disassembly and cleaning after the construction. It is recommended to use EPS 200 for the insulation of rostwerk foundation. This type of EPS shows lowest water absorption after immersion as well as the highest mechanical resistance. Additionally, rostwerk foundation from BalPol EPS 200 has the highest thermal resistance on the market.

Technical parameters

Type of polystyrene foam

done EPS 100-200

Standard length and height

done 2000x560mm

Standard dimensions

done According to the project

Possible options

done L-shaped, other non-standard shapes

Technical properties of polystyrene foam according to EPS type

EPS type	EPS100	EPS150	EPS200
Average density (kg/m3)*	18,5	23,4	27,5
Long term water absorption by total immersion, WL(T)	≤ 3 %	≤ 3 %	≤ 2%
Thermal conductivity, λD (W/m·K)	≤ 0,035	≤ 0,034	≤ 0,033
Compressive strength at 10 % deformation, (kPa)	100	150	200
Bending strength (kPa)	150	200	250
Reaction to fire	E	E	E

*Density is not relevant for the classification of polystyrene foam.

All properties are declared in accordance with the requirements of the EU standard EN 13163: 2012 + A1: 2015 and related documents

Installation instruction

U-shaped insulated formwork installation:

After the pile foundation has been formed, the rostwerk is prepared by levelling ground to the required altitude and compacting it if required.
The installation of the permanent formwork starts from the corner of the building, using the BalPol corner part. An opening is cut in the base part to allow the reinforcement of the pile to pass through.
Next, the base plates and corners are assembled along the perimeter of the foundation.
Rostwerk reinforcement is installed by tying it to the pole reinforcement.
After completion of rostwerk reinforcement, the installation of the side panels begins. The side panels are assembled from the corner of the building. All joints must be additionally glued with polyurethane glue. Side panel joints should not intersect with base plate joints.
The assembled insulation layer is fastened together with a long-threaded system, installed through a plastic pipe between the side panels. Wood planks are placed outside of the formwork 20 cm from the top of the panel, long threads are installed every 0.8 m and a whole contraption is tied together.
It is recommended to support the formwork with wood studs every ~ 1 m. and strengthen the corners to prevent possible movement during concreting.