Description

The risk matrix in E2/AS1 is a key tool for weathertightness assessment and showing compliance with the Building Code. Let’s walk through the steps on how to use it.

New Zealand Building Code clause E2 External moisture deals with the weathertightness of the building envelope for buildings within the scope of NZS 3604:2011 Timber-framed buildings. These are described as up to 3 storeys or no greater than 10 m in height, with a floor plan limited by seismic and structural control joints and with vertical walls and roofs with a pitch of 60° or less.

Acceptable Solution E2/AS1 provides one means of compliance with clause E2 so buildings that are designed in accordance with E2/AS1 must be accepted by the building consent authority (BCA).

Scope

This article includes:

• E2/AS1 risk matrix
• Risk factor categories
• Risk scores
• Complete a risk matrix for each façade
• Refer to the guide