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The new Bluewater retail development near Dartford is now open. It has over 125,000m2 of roof area - mostly covered in Sarnafil single- ply membrane. The specification was Sarnafil s327-15el over 90mm Rockwool Hardrock and a Sarnavap 1000 vapour retarder on a metal deck. The membrane was mechanically fastened using the rapid Sarnafast installation system and foot-traffic areas were defined using Sarnatred interlocking walkway tiles, heat-welded to the membrane surface.