If a non-invasive moisture, weather tightness, thermal imaging or building inspection has shown areas of elevated moisture readings or areas of concern due to external or internal moisture ingress, you will need to carry out invasive or destructive testing to determine the following: 

  • Condition of internal framing timber and construction elements. 
  • Is the framing timber still viable or does it require full replacement? 
  • The spread and extent of any damage due to moisture. 
  • Identification of the cause of the moisture and recommendations for repairs and prevention. 
  • Realistic pricing and scope of works documents to show you the repair or remedial works required. 

Destructive testing involves internal or external invasive investigation using hammer probe testing, use of an endoscope camera, destructive testing to take core samples of internal framing timber and the removal of sections of internal linings or external cladding to ascertain the cause, extent and resultant damage of water ingress.

Weather Tight Solutions are leaders in invasive testing and often asked to follow on from other inspection companies once a potential problem has been discovered during non-invasive building inspections.

Internal invasive testing is performed with slide hammer probes or drilled hole probes through the plasterboard and into the hidden timber framing. Accurate moisture readings and samples are taken at varied depths and the results are analysed to determine the condition of moisture-affected timbers within the wall cavity and assess the likelihood and extent of any timber decay. 

If high levels of moisture are determined or decay is suspected, it is then recommended that either inspection holes are made or the plasterboard wall linings are carefully removed to visually assess/confirm damage to the timber framing and determine the cause of moisture ingress.

External invasive testing can be carried out through the external cladding material using drilled hole probes and with the same testing procedures as above, however internal access is preferred as this does not further effect the weather tightness of the property. 

We provide detailed reports to itemise all findings, identify what is currently causing water ingress and any defects or areas which are likely to cause future water ingress, plus breaches of the New Zealand Building Code that may have occurred. We are happy to provide recommendations for remedial works and can assist you in all aspects of the remediation process. 

When needed, Weather Tight Solutions can provide documentation and act as an expert witness for legal claims or court cases.