Garages – cladding and flooring clearances in E2/AS1

Guidance on how to achieve adequate clearance between a driveway and the cladding around garage door jambs, with reference to Acceptable Solution E2/AS1.

This information was confirmed as current in February 2016. It originally appeared in Codewords newsletters prior to January 2014.

  • Published on 1 December 2007
  • Of interest to Homeowners, Builders

Garage floors must be low enough for vehicle access and high enough to provide a weathering step-down to the exterior, yet still maintain a clearance between the wall cladding and the ground on either side of the garage door.

The Acceptable Solution E2/AS1, for Building Regulations Clause E2 External Moisture, describes the particular clearances required for wall claddings and relative floor levels, and the requirement for water to drain away from the threshold.

While Acceptable Solutions are not mandatory, they provide one way to comply with the Building Regulations.

Within E2/AS1 Figure 65: Levels and garage openings illustrates the required clearances for exterior claddings to exterior ground.

It shows a change of level between the garage finished floor level and the exterior paved driveway with details for the threshold. There is no specific requirement in E2/AS1 for a level change between the building finished floor level and the garage floor level.

Where building and garage floor levels remain the same, the Comment to Paragraph 9.1.3.4 gives three methods for achieving the respective step-downs at the garage door threshold and adjacent cladding.

All guidance related to E2 External moisture

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This information is published by the Your home’s Chief Executive. It is a general guide only and, if used, does not relieve any person of the obligation to consider any matter to which the information relates according to the circumstances of the particular case. Expert advice may be required in specific circumstances. Where this information relates to assisting people: