Interesting Info: Expanded Polystyrene Blocks

Interesting Info Expanded Polystyrene Blocks

Expanded Polystyrene Blocks

Expanded Polystyrene means EPS. it is a super lightweight closed cell rigid plastic form. EPS is approximately 1% the weight of soil and less than 10% the weight of other lightweight filled alternatives. As a lightweight fill, EPS reduces the loads imposed on adjacent and underlying soils in structures.

There are many brands available in the market for lightweight blocks such as Geo Foam, dura Block, Moda form, fill core, mirip last, et cetera. All these brands offer the same product. The basic material in this lightweight blocks is Expanded Polystyrene  

Applications of EPS

  • Roadway Construction Over Poor Soils  
  • Roadway Widening  
  • Bridge Abutments  
  • Bridge Underfill.  
  • Culverts  
  • Pipelines And  
  • Buried Structures  
  • Compensating Foundations  
  • Rail Embankment.  
  • Landscaping Architectural Green Roofs.  
  • Retaining And Buried Paul Backfill.  
  • Slope Stabilisation  
  • Stadium And Theatre Seating.  
  • Airport Runway And Taxiways.  
  • Foundation For Lightweight Structures  

Laying Process of EPS:

An adhesive: compatible to EPS is used for bonding with bottom surface and interlocking between the blocs

Geo Textile Membrane: of 150 GSM Unblock shall be placed with minimum overlap of 50MM. In our building project we have used 100MM concrete screed of M30 grade as a protective cap on top.


Precautions while laying EPS blocks

Buoyancy: because of it’s closed cell structure and lightweight EPS is buoyant. It can be minimised by installing APS about the water table and ensuring suitable drainage. In addition it can be counteracted by placing overlying soils, pavements, sidewalks to sufficiently offset. Uplift forces resulting from Buoyancy

Combustible: EPS is combustible when exposed to an oxygen source, so it is important to cover with non flammable materials. That is soil et cetera, and include a flame retardant. APS is usually isolated by membranes, soils or payments in the finished application.

Water absorption: APS has closed cell structure that limit water absorption. When used in well trained conditions, no change in EPS weight is expected overtime




Expanded polystyrene is a rigid and tough closed cell foam with a normal density range of 11 to 32 KG/M cube. It is usually white and made of Pre-Expanded Polystyrene bids. Expanded polystyrene, EPS or extruded polystyrene XPS manufactured into large lightweight blocks. The blocks vary in size.



Manufacturing of APS.

Raw bids are expanded using steam creating pre profit which are then cured in large bags before being conveyed to the molding. Once in the mold the Pre-bids are against him to form a block. The blocks are then placed on the storage floor to age for the appropriate length before being cut into various shapes and sizes. Blocks are produced in several densities to meet specific project mix. 


Advantages of EPS Blocks

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It can be cut to any size:

EPS can be cut and shape either at plan or site to create any architectural and landscaping profiles.  Read More »


EPS geofoam is about 100 times lighter than soil and much lighter than other light which feels like cellular, concrete, shredded tyres, pumis wood chips, et cetera Read More »


Despite its low weight, EPS is strong enough to support traffic and landscaping equipment. Loads  Read More »

Compressive Strength:

 EPS is engineered for high strength with compressive resistance values of. 2/2/15 PS I at 1% strength. Read More »

Easy to Handle:

 The material is easy for workers to carry an place by hand.  Read More »

Skill Training is not Required:

Installation does not require much skill training.  Read More »

Chemical Resistance:

EPS does not decompose nor is affected by road soils, petroleum products and other chemicals can damage EPS, so incorporation of protective layers or barriers is used.  

Example given:

soil cover, concrete slabs, geomembranes, etc.  Read More »

Long Life Span:

The EPS can be recycled, no rotting because of damp weather.  Read More »

Things to know about lightweight filling blocks before buying it.

EPS density: you should know your load requirement and accordingly you can select the density of APS block.

Compressive Strength: you should know where you are going to use it, whether it is high traffic area or low traffic area.

Bedding material: what kind of building material is there? Is it RCC or soil, et cetera that we need to cheque.

Block dimensions: as per site condition, we can derive the sizes of blocks to minimise the wastage,

Flame resistance: 

Moisture absorption, 


Block layout and placement. 

Cover and UV protection. 

Concentrated loads 

Stability of adjacent ground. 


Bearing capacity. 

All these things we have to consider before purchasing EPS blocks.