When specifying stone it is necessary to cover three main aspects of performance;
CWCT has produced two guides to help the stone specifier. These are:
Guide to the selection and testing of stone panels for external use
Performance and testing of fixings for thin stone cladding
The documents may be purchased here.
Stone walls have to meet the normal weathertightness and other performance
criteria of the building envelope. Stone panel walls
are most frequently constructed as ventilated rainscreens and the specifier
should also use the ‘CWCT standard ‘Standard for walls with ventilated
A new single document on the specification of stone panels and their
fixing is under development.