Magnesium oxide (MgO) boards are factory-manufactured products and commonly used as external sheathing boards. There is no British Standard for MgO boards and hence boards are currently tested to BS EN 12467 (Fibre-cement flat sheets - product specification and test methods) for their physical and mechanical properties.
Recently, it has become apparent that some MgO boards are failing in-situ and do not hold verification of performance. The failures overseas were caused by MgO boards absorbing moisture in locations with high humidity; this resulted in drops of brine forming on the surfaces. The drops subsequently ran down the boards and into adjoining wooden or metal components, which over a period of time, caused the MgO boards to disintegrate. Metal fixings in contact with the boards have also become severely corroded within short periods of time. Both types of failures led to worrying structural safety issues.
In order to ensure boards are fit for purpose and meet long-term performance criteria, it is vital they are tested and meet the necessary requirements to achieve independent third party certification.
NHBC has published a Technical Update stating that "where products with a critical function are used on a NHBC registered sites, they should hold suitable verification of their performance".
Lucideon provides independent testing and verification services MgO boards which enables customers to comply with NHBC Standards.
For further information about Lucideon's services for MgO boards, please click here. Alternatively, contact Joanne Booth, Business Manager for Construction: joanne.booth@lucideon.com or +44 (0)1782 764410.
