Pitched-roof underlay testing facility

This testing facility has been developed in conjunction with the BSI to determine the performance of roof underlays to resist the design wind loads imposed on roofs. A range of wind load pressures up to 2500 Pa can be applied to underlays laid on rafter centres of up to 600 mm and batten gauges of up to 345 mm. This test procedure is  included in the recent revision of BS 5534.