Planning Advisory Services
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Common Projects: Roofing

If the project is to carry out roof repairs or re-cover less than 25% of the area (flat or pitch roof), then Building Regulations approval will not normally be necessary. However, approval will be necessary if

  1. You carry out structural alterations
  2. The performance of the new covering will be significantly different to that of the existing covering in the event of a fire
  3. 3. The area replaced or repaired is more than 25% of the roof area. This is due to the fact that the roof thermal insulation would normally need to be improved

Existing Roof

The removal or alteration to any roof elements could affect how the roof works and cause movement to occur. Movement could cause cracks to occur in the walls and, possibly, the eventual collapse of the roof. When performing work on any roof, care should be taken to ensure the roof will continue to perform effectively and without any movement.

Existing Pitched Roof

The existing roof structure that forms the loft space has a number of timber elements that make the overall pitch. Each element enables the roof to span across the building and support the tiles/covering on top as well as being able to transfer the loads (weight) created by any wind and snow down to the walls.

New Roof

There are separate rules for construction of new roofs. A new roof will be required to:

  • resist weather
  • resist the spread of fire from one property to another
  • be able to support loads (weights)
  • provide resistance to heat loss (insulation)
  • be ventilated to protect from condensation (in most cases)
  • have adequate drainage

There are generally two types of roof construction used:

  • Pitch roof - This is where tiles or slates are used and a void is usually created underneath.
  • Flat roof - This usually consists of felting which has a slight fall to allow rain water to drain off.

To enable compliance with the requirements of the Building Regulations full details of the new roof will be needed - including materials and their dimensions and performance properties.

Planning Advisory Services Booklet
Planning Advisory Services Booklet

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Energy Saving Trust

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