Flat roofs, terraces and balconies

Also see:


Flat roofs, terraces and balconies shall comply with the Technical Requirements

Flat roofs, terraces and balconies which comply with the guidance in this chapter will generally be acceptable to NHBC.

Other sources of information include:

  • BS 6229 Flat roofs with continuously supported flexible waterproof coverings. Code of practice.
  • BS 8579 Guide to the design of balconies and terraces.
  • BS 8217 Reinforced bitumen membranes for roofing. Code of practice.
  • BS 8218 Code of practice for mastic asphalt roofing.
  • BS 8747 Reinforced bitumen membranes for roofing.
  • BS 5250 Code of practice for control of condensation in buildings.
  • BS 5427 Code of practice for the use of profiled sheet for roof and wall cladding on buildings.
  • BS 6915 Design and construction of fully supported lead sheet roof and wall coverings. Code of practice.
  • BS EN 507 Roofing products from metal sheet – Specification for fully supported roofing products of aluminium sheet.
  • BS EN 1090-4 Execution of steel structures and aluminium structures. Technical requirements for cold-formed structural steel elements and cold-formed structures for roof, ceiling, floor and wall applications.
  • BS EN 12056 Gravity Drainage Systems inside buildings. Part 3 Roof drainage, layout and calculation.
  • BS 8490 Guide to siphonic roof drainage systems.
  • BS 8204 Screeds, bases and in situ floorings.
  • National Federation of Roofing Contractors (NFRC) – e.g. NFRC Technical Guidance Note for Construction and Design of Blue Roofs. Roofs and podiums with controlled temporary water attenuation.
  • Mastic Asphalt Council (MAC) Mastic asphalt – The technical guide.
  • Single Ply Roofing Association (SPRA) Single Ply: Design Guide.
  • Federation of Traditional Metal Roofing Contractors (FTMRC) ‘UK Guide to Good Practice – 3rd edition’.
  • Lead Contractors Association ‘Lead Sheet in Roofing. The Ultimate Guide to Best Practice’.
  • Lead Sheet Training Academy ‘The complete manual’.
  • The GRO Green roof code of practice for the UK.
  • The Green Roof Organisation GRO fire risk guidance document.
  • CIRIA C753 SuDS Manual 2015
  • Roofing and Waterproofing Test Association (RAWTA).
  • Liquid Roofing and Waterproofing Association (LRWA) Code of Practice Specification and Use of Liquid Applied Waterproofing systems for Roofs, Balconies and Walkways.
  • Siphonic Roof Drainage Association (SRDA) A guide to Siphonic Roof Drainage.
  • Metal Cladding and Roofing Manufacturers Association (MCRMA).

Where a flat roof or terrace is above another home, it should provide satisfactory acoustic performance in accordance with
relevant building regulations.

Where applicable, flat roofs, balconies and terraces should meet the relevant fire protection requirements in accordance with relevant building regulations.