Frequently Asked Questions

Does a Sunbloc house burn?
The concrete cannot burn, and the Graphite/EPS foam is self extinguishing. In a really fierce blaze, well after the occupants have left, the main gases produced are CO2 and water vapor, with a minute amount of styrene, bromide and CO2, which are less harmful than the compounds produced by the same volume of other building materials. The structural stability of the concrete reduces the risk of building collapse.

Please see BBA Certification.


Has Sunbloc undergone fire testing?


Sunbloc has to achieve minimum fire performance standards to satisfy the Building Regulations applicable to the project. From a minimum 30 minute fire rating the design of the wall may be adjusted and fire tested to achieve the highest fire standards required.

Please see BBA Certification.


Is a special concrete required?


A simple designated pump able RC 25 concrete with a slump of S2 or S3, with max. 10 mm aggregate should be specified. Ask for concrete supplied under QSRMC or BSI quality-assured schemes.


How is the concrete placed and does it need vibrating?


The pump-grade concrete is placed into the formwork by means of a pump or skip, and will fill the system through gravity flow. The correct pump grade concrete will flow, fill and self-compact without the need for mechanical vibration.


How many pours are required per storey?


The pattern of concreting will vary from project to project, depending on circumstances and resources available. A storey height pour may be completed in one operation.


Is steel reinforcement required?


Any requirement for steel reinforcement will be dependent on the type, size and location of the building and will be recommended by your designer but usually no steel is required above ground level apart from the lintel strengthening but always consult your Structural Engineer for full compliance for your specific requirements.


How stable are the walls during construction?


During construction, it is necessary to support the formwork system with our trestle support system and then consistently check for alignment during the pour, adjusting as required.


How robust is the completed structure?

Sunbloc is incredibly robust as its monolithic especially if our V-Tec beam system is used in conjunction with the Sunbloc

See our BBA Certificate. 


How weather-tight is Sunbloc?


A Sunbloc building with roof installed and without cladding is sufficiently weather-tight to enable installation of internal services and finishes. Application of the appropriate cladding is required to ensure the long-term weather- tightness of the building and protect the insulation but no breather membrane is required.


What is EPS?


Expanded Polystyrene, or EPS for short, is a lightweight, rigid, plastic foam insulation material produced from solid beads of polystyrene. Expansion is achieved by virtue of small amounts of pentane gas dissolved into the polystyrene base material during production. The gas expands under the action of heat, applied as steam, to form perfectly closed cells of EPS. These cells occupy approximately 40 times the volume of the original polystyrene bead. The EPS beads are then molded into appropriate forms suited to their application.


Who needs EPS?

Anyone who needs to thermally and acoustically insulate walls, roofs or floors will find EPS the ideal, cost-effective and easy-to-use material in all types of buildings, from houses and offices to factories and schools. EPS is used by civil engineers as a lightweight fill or void-forming material. It is also used as a flotation material


If you do not find answers to your questions, please contact us and we will be happy to help.