EPS: Lightweight thermal insulating mortar. EPS beads which are treated with a chemical additive to enable the production of lightweight, thermal insulation mortars of various densities.

Technical Data

The Springs EPS facility is ISO 9001:2008 accredited.
K-value of 0.065 W/m.K to 0.1 W/m.K depending on density.
Thermal insulation mortar for concrete roof decks, underground floor slabs, basement walls, swimming pools, etc. Lightweight filler for voids or leveling of floor slabs. Cavity fill for steel frame construction.
Long term to indefinite, subject to appropriate mix design and best practice in application methods.
Conventional concrete placing equipment.
Bags should be stored in a clean, dry place away from items which could split or damage the bags.
Non-flammable – when tested to ASTM D 1692-68
The Springs EPS facility is ISO 14001:2004 accredited. Less material, less energy and less emissions 1.Zero ozone depleting potential (ODP) 2.Zero global warming potential (GWP)

  • Easy to mix, place and finish
  • Cost effective
  • Homogenous bead distribution gives good workability and predictable performance
  • Good workability enables mixed material to be pumped 100 m horizontally and 30 m vertically
  • No loss of workability, even when pumped long distances
  • Mix design variable to produce densities from 200 to 1 000 kg/m3
  • Compatible with most finishing products and adhesives

The material must be mechanically mixed in either a purpose made mixer/pump, conventional concrete mixer or truck-mixer or specialised mortar mixer/pump Placing and finishing equipment: as for normal concrete/screed application
Thermal insulation to concrete roof decks should be Politerm Blu, laid to falls at an average thickness of 100 mm reducing to a minimum of 50 mm at rainwater outlets. Preparation, mixing and curing should be carried out in strict accordance with the manufacturer’s instructions. Subsequent application of waterproofing should not commence until the Politerm screed is free of residual moisture.

Product Performance

Cost effective

Zero global warming potential (GWP)



Zero ozone depleting potential (ODP)


Politerm Blu is a pre-manufactured product which consists of expanded polystyrene (EPS) beads that are pre-treated with a chemical additive. This chemical treatment allows the effective mixing of the beads with water and cement in order to produce a mortar which is laid to falls as a thermal insulating roof screed. Politerm beads mix easily with cement and water, without floating and separation, provided that the simple mixing instructions are followed.


2 x 420 litre bags of Politerm beads and 5 x 50kg bags of cement (32.5N) are required to produce 1 cubic metre of thermal screed mix. The material must be mechanically mixed in either a conventional concrete / mortar drum mixer, concrete truck mixer or purpose made Politerm PM1000 mixer/pump. The mixing action should be slow in order to achieve a good blending of the ingredients rather than a fast and harsh crushing together action, as this destroys the slight foaming action released by the chemical additive. Material should be added in the following order: 1. Approximately 120 litres water (clean, potable water) 2. 2 x 420 litre bags Politerm beads (allow to mix for 30 seconds) 3. Gradually feed in the cement and mix thoroughly for 5-6 minutes 4. Plaster sand (optional) may be added last to increase density and compressive strength When applying the above mix to a concrete roof slab the concrete should first be saturated with clean water and not allowed to dry out prior to the application of the Politerm screed. Ponding of water should not be allowed. The Politerm screed mix should be “laid to falls” to rainwater outlets at a minimum thickness of 50mm. The maximum thickness will be determined by the distance of the fall. The use of steel or timber guides is recommended to ensure accuracy and enable the use of a straight-edge to strike off the mortar. Floating of the surface is not possible. A smooth finish for waterproofing can be achieved by: a) Trowelling in a thin skim of sand and cement prior to setting, or b) Allow the Politerm screed to harden and sand off the surface with a disc sander, removing the resultant dust before waterproofing* In accordance with good concreting practice the Politerm screed should be kept damp by spraying with water to prevent rapid drying out; however, the screed should be allowed to dry out before application of waterproofing to avoid entrapment of excess moisture. The density of Politerm mixes can be varied to suit different applications such as under-surface bed insulation, void filling etc. Please contact us regarding applications other than the thermal insulation screed described above.


Polytec / Politerm Blu Data Sheet