Roof of Onduvilla Bitumen

Specification of Roof of Onduvilla Bitumen

Onduvilla is derived from Onduline, material is equal to Onduline bitumen cellulose fibers, but it looks like tile tesusun contents 3. 
Size 1060mm x400mm. 
Batten spacing = 30cm. 
coverage per lbr = 0, 31m2 
1 m2 = 3 pcs 
demand spikes = 8 pcs / sheet