Description

Design trends are seeing an increase in the use of internal gutters, previously seen as risky. With advances in their design and construction, they are now a viable option.

At a glance:

• Because of design trends, internal gutters are becoming more popular.
• They have been associated with weathertightness failure.
• E2/AS1 is the associated guidance document.
• Building owners must be made aware that internal gutters need regular maintenance.

Scope

This article includes:

• Internal gutter and weathertightness
• Factors for failure
• Refer to E2/AS1
• Butyl and EPDM membrane internal gutter requirements
• Membrane internal gutter - discharge options
• Membrane internal gutter - design and construction
• What to consider
• Maintenance is crucial