Membrane internal gutters – lifting seams

The current Acceptable Solutions to the Building Code for external moisture do not permit lapped membranes in internal gutters

Causes

For butyl rubber, adhesive failure 


Listed under: membranes, Roof, gutters

Cause

For butyl rubber, adhesive failure 

Repair

  • given the fact that internal gutters can be problematic and increase the risk of leaks in a roof, any construction work on them should be carried out by a person with the appropriate skills, experience and equipment. This is not work for a novice. Work on roofs is restricted building work under the Building Act and anyone engaged to carry out this work must be a licensed building practitioner or be supervised by an LBP

  • if you know the supplier of the membrane, or even the original installer, contact them first. Membrane suppliers typically require their products to be installed or repaired by authorised agents. Inappropriate work on a membrane may void the original warranty

  • where it is suspected that water has been entering the building over a period of time and there is a risk of damage below the roof, engage a building surveyor to report

  • check the gutter annually for damage or deterioration to the lining and outlet(s)