SOPRABOARD is a semi rigid, asphaltic roofing substrate board for use in approved multi-ply membrane and flashing assemblies. SOPRABOARD is composed of a mineral fortified asphaltic core formed between two fiberglass reinforcing plies. SOPRABOARD is designed for use with SOPREMA's SBS Modified bitumen membranes and may be used as a protection board in Soprema's waterproofing systems and assemblies.