The timber roof beneath
Beast roofs use 25mm timber planed to a 20mm finish. Other ranges use 16mm timber planed to a 12mm finish. Large cross struts are positioned at specific points to add strength.
40kg green mineral felt
Standard roofing uses 40kg heavy-duty, cross-threaded green mineral felt. The supplied comparison image demonstrates how difficult this felt is to tear compared with a lighter competitor-style felt.
Onduline
Onduline is made from cellulose fibres impregnated with bitumen, compressed into a 3mm-thick corrugated board with 50mm corrugations. It is a more durable alternative to felt and is designed to remain weatherproof for many years.
