When mechanically attaching single ply membranes to a structure, the interface performance of the structure plus the membrane, fastener and pressure plate performance, are key factors in determining the optimal performance of the finished roofing system.


To ensure that a roofing system's resistance to wind uplift can be correctly calculated, the individual combination of fastener type, membrane type and substrate type, should be tested in accordance with UEAtc directive; “Supplementary Guide for the Assessment of Mechanically Fastened Waterproofing” and Factory Mutual FM 4470.


To ensure the correct fasteners are used in every Sarnafil roofing system, Sika Limited supply a range of Sarnafil fasteners including thermally broken tube fasteners, pressure plates and fasteners, manufactured to our specification by SFS Intec Ltd. This enables Sika limited to provide a Sarnafil guarantee that covers the roofing system* and its attachment, for both product failure and resistance to wind uplift, backed by Product Liability and Professional Indemnity Insurance.


* The roofing system (vapour control layer, insulation, membrane and ancillary components) is only covered if a Sarnafil Extended Products guarantee is used. If a Sarnafil Product guarantee is required, only the waterproofing membrane, its attachment and any ancillary components, are covered.

SFT Tube System

The SFT thermally broken tube systems consists of the SFT tube assembled with the appropriate screw fastener. The SFT tube system is used to restrain Sarnafil S/TCS mechanically fixed membranes, by installing rows of SFT fasteners in the side lap of the sheet, at centres determined by the wind uplift and the deck type.




SBT Tube System

The SBT thermally broken tube system consists of a 15mm diameter grey polypropylene SBT tube, assembled with the appropriate screw fastener. The SBT tube system is used to fix Sarnabars when installing either a Sarnafil S/TCS mechanically fixed Sarnabar system or a Sarnafil G/TCG loose laid ballasted system. The SBT tube system is also used in conjunction with the SBIW insulation washer, to fasten mechanically fixed insualtion.





Declaration Of Performance

Sarnafast SBF & Sarnabar Tube SBT

Sarnafast SBF & Sarnafast Insulation Washer DTL