Installation procedure
Reference must be made to further documentation where applicable, such as relevant method statement, application manual and installation or working instructions.
Fixing method - General
The waterproofing membrane is installed by loose laying ( without stretching membrane or installing under tension) with mechanical fastening in seam overlaps or independent from overlaps. Overlap seams are hot welded using specialised hot air equipment.
Fixing method-Linear fastening (Sarnabar®)
Unroll the Sarnafil® TS 77-18 E membrane, overlap by 80mm, weld immediately and fix to the substructure by means of the Sarnabar® fasteners. The preferred type of fastening will be advised by Sika. The spacing of the fasteners is in accordance with the project specific Sika calculations. The perimeter piece ends must be secured with the Sarnabar® Load Distribution Plate. For protection fasten a piece of Sarnafil® TS 77-18 E under bar end and plate. Leave a 10 mm clearance between bar ends. Do not fasten in hole nearest bar end. Cover the bar ends with a piece of Sarnafil® TS 77-18 E and weld. After installation the Sarnabar® must immediately be made watertight with a Sarnafil® TS 77-18 E cover strip. At upstands and at all penetrations, the Sarnafil® TS 77-18 E membrane must be secured with a Sarnabar®. The 4 mm diameter S-Welding Cord protects the Sarnafil® TS 77-18 E roof covering against tear ing and peeling off by wind uplift.
Fixing method-Spot fastening (Sarnafast®)
Sarnafil® TS 77-18 E must always be installed at right angles to the deck direction. Sarnafil® TS 77-18 E is fixed by means of the Sarnafast® fasteners and barbed washers/tubes along the marked line, 35 mm from the edge of the membrane. Sarnafil® TS 77-18 E is overlapped by 120 mm. The spacing of the fasteners is inaccordance with the project specific Sika calculations. At upstands and at all penetrations, the Sarnafil® TS 77-18 E membrane must be secured with a Sarnabar ®. The 4 mm diameter S-Welding Cord protects the Sarnafil® TS 77-18 E roof covering against tearing and peeling off by wind uplift.
Hot welding method
Overlap seams must be welded by electric hot welding equipment. Welding parameters including temperature, machine speed, air flow, pressure and machine settings must be evaluated, adapted and checked on site according to the type of equipment and the climatic conditions prior to welding.
Testing overlap seams
The seams must be mechanically tested with screw driver to ensure the integrity/completion of the weld. Any imperfections must be rectified by hot air welding.