Duquesa slates will withstand the most severe weather conditions. They are unaffected by sunlight, ultraviolet and acid rain.
For rafter centres up to 600 mm, use 50 x 25 mm size battens.
Standard product features
Tested to BS EN 12326: Part 1: 2004.
Depends on slate size and exposure.
Depends on slate size, exposure and roof pitch.