Technical Guidance

Question:

Is it necessary for a small pediment gable wall to be of cavity construction?

Considerations:

• The inner leaf needs to be constructed from the wallplate and around the rafters.

• Some wind-driven rain may penetrate fairfaced brickwork.

• The outer leaf needs adequate support.

Answer:

Small pediment gable walls should be of cavity construction, although it may be impractical to build a masonry inner leaf e.g.

masonry should not be built o a timber wall plate.

An acceptable detail for a small pediment gable wall is: