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
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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.
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