Rostwerk foundation

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

Category:

Technical parameters

Type of polystyrene foam
EPS 100-200

Standard length and height
2000x400mm
Standard dimensions
According to the project

Possible options
L-shaped, other non-standard shapes

Contacts
Paulius

 

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:

  1. After the pile foundation has been formed, the rostwerk is prepared by levelling ground to the required altitude and compacting it if required.
  2. 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.
  3. Next, the base plates and corners are assembled along the perimeter of the foundation.
  4. Rostwerk reinforcement is installed by tying it to the pole reinforcement.
  5. 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 plates joints.
  6. The assembled insulation layer is fastened together with a long-threaded system, which is installed through a plastic pipe placed between the side panels and wooden planks are placed on the outside of the formwork (25×100). Long threads are installed every 0.6 m. and in the middle of the formwork.
  7. It is recommended to support the formwork with wooden studs every ~ 1 m. and strengthen the angles to prevent possible movement during concreting.

Certificates and approvals

DECLARATIONS OF PERFORMANCE

DOP EPS 100 (PDF)

DOP EPS 150 (PDF)

DOP EPS 200 (PDF)


CERTIFICATES OF PERFORMANCE

EPS 100 certificate (PDF)

EPS 150 certificate (PDF)

EPS 200 certificate (PDF)


MANAGEMENT SYSTEM

ISO 14001:2015, ISO 9001:2015 certificate (PDF)