CROSS Safety Report
Galvanic (bimetallic) corrosion not considered in cladding design
A cladding designer and installer did not consider galvanic (bimetallic) corrosion which led to remedial works being required.
Key Learning Outcomes
For cladding designers and installers:
- Selecting the correct fixings and isolating materials where dissimilar metals are jointed together is important to ensure they perform as expected
- Cladding design and installation should be given the same degree of attention as the primary structure during both design and construction to improve safety, reliability and longevity
- The anticipated life span of the fixings should be noted in the operation and maintenance manual
- Manufacturers' instructions provide helpful guidance on fixings. The Construction Fixings Association (CFA) website and CIRIA publication C778 Management of safety-critical fixings are also useful references
Find out more about the Full Report
The Full Report below has been submitted to CROSS and describes the reporter’s experience. The text has been edited for clarity and to ensure anonymity and confidentiality by removing any identifiable details. If you would like to know more about our secure reporting process or submit a report yourself, please visit the reporting to CROSS-UK page.
On a recent project, says a reporter, the cladding designer and installer did not consider galvanic (bimetallic) corrosion. To prevent this from happening stainless steel bolts were retrofitted with plastic sleeves where they were in contact with aluminium cladding framework. Plastic spacers were used where different metals were being joined together. The reporter found that the installers had a lack of understanding of the problem. All connections are now hidden behind finishing panels and not readily available for inspection.
Expert Panel Comments
Find out more about the Expert Panels
Expert Panels comment on the reports we receive. They use their experience to help you understand what can be learned from the reports. If you would like to know more, please visit the CROSS-UK Expert Panels page.
There are no Expert Panel comments on this report. The Expert Panels are only asked to comment on selected reports. These are normally reports where there is an opportunity for them to help you understand what can be learned from the report.
Submit a report
Your report will make a difference. It will help to create positive change and improve safety.
Our secure and confidential safety reporting system gives professionals the opportunity to share their experiences to help others.
No feedback has yet been published for this page.