View the Soprema entry on BPI Visit the Soprema website The highlight of SOPREMA’s defined range of high performance waterproofing is the introduction of SOPRALENE OPTIMA, this membrane. Sopralene Optima stands out from other SBS modified bitumen membranes because of its bespoke bitumen blend, optimum adhesion and resistance to extreme temperatures down to -30 ° C. This gives the product …