Description

Using longer and thicker nails to fix horizontal timber weatherboards to structural framing through cavity battens can damage the weatherboards. However, there’s a way round this.

The drained and ventilated cavity behind horizontal timber weatherboards is formed by nominal 20 mm thick x 45 mm timber cavity battens fixed vertically to the outer face of the exterior wall framing. The battens are fixed to the framing – primarily studs – to act as packers that form a cavity that keeps the back of the weatherboards clear of the wall underlay or rigid air barrier (RAB), which is fixed to the face of the framing.

Scope

This article includes:

• The relevant Acceptable Solution
• Solving the problem