PROS

• Robust and airtight, making it an obvious choice for the 27 per cent of UK homes in flood-risk areas.
  
• Fire and waterproof.
  
• Excellent sound quality.
  
• A monolithic, seamless material which can be manipulated into highly complex forms.

CONS

• Its harsh, brutal look isn’t to every grand designer’s taste.
  
• Skilled work – you need more than a spanner and screwdriver!
  
• You’ll need a qualified engineer to handle all structural work Risk of air ‘nests’ when pouring concrete.