Roof Shingle Design Considerations

Remember, Building Regulations require that new construction and re-roofing projects over a certain size require Building Regulations approval and inspection by building control.

Roof Design Considerations

  • Roof pitch – the roof pitch for shingles must be no less than 15º and adequate drainage and guttering must be provided. Icopal shingles can be applied to vertical surfaces as cladding.
  • Roof drainage – ensure adequate guttering and drainage is provided to accommodate the volume of water from the roof.
  • Insulation – habitable rooms will require levels of insulation to comply with Building Regulations whilst sheds, summer houses and the like can be un-insulated.
  • Roof access – ensure that the roof is adequately designed for its intended use and for future access for maintenance.
  • Wind action – ensure the roof structure is adequately designed and restrained against wind damage.  Particular attention is required for high level roofs or exposed and coastal locations.
  • Condensation – adequate steps should be taken within the roof design to ensure protection of the structure from the build up and harmful effects of condensation. (Refer to the roof design options above.
  • Compatibility – Icopal Bitumen Roofing Shingles are compatible with most materials normally associated with roofing structures. However solvent based products and timber preservatives containing solvents may soften bitumen and should be avoided, special care should be taken when choosing treated timber for use in the roof structure.

Deck Materials

Icopal Bitumen Roofing Shingles are suitable for application over the following types of roof deck:

  • Plywood – Class 2 or 3 to B.S. EN 314:part 2:1993 and B.S. 5268:part 2:2002, pre-treated in accordance with B.S. 6566:part 7:1985, minimum thickness 18mm.
  • Orientated Strand Board (OSB/3) – to B.S. 5669:part 3:1992 grade F2 minimum thickness 18mm.
  • Close timber boards or tongue & grooved boards – boards of 25mm minimum thickness should be applied close butted  with a maximum 2mm joint space. Boards must be properly fixed with irregularities between board thickness no more than 2mm.
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