The Fatra mechanically fastened system uses our FF810 reinforced membranes in conjunction with the appropriate fixings, washers, PVC fixing discs and adhesives to secure the membrane to the substrate. This system can be used in a warm or cold roof application and over a range of substrates including profiled metal decking, plywood and concrete.
The Fatra mechanically fixed system uses Fatra FF810 reinforced membranes in conjunction with the appropriate fixings and adhesives to secure the membrane to the substrate. This system can be used in a warm or cold roof application and over a range of substrates including profiled metal decking, plywood and concrete.
Lay VCL to the substrate in accordance with manufacturers installation recommendations. Loose lay the insulation board to a staggered bond pattern, following the manufacturer’s installation recommendations.
Set out PVC fixing discs to the fixing design, provided by the Tecron Technical Department, using the specified fixings (tube washers with the appropriate fastener). Across the width of the membrane sheet, the discs should be fixed in accordance with the fixing design but not greater than 650mm centres. The row of fixings closest to the roof perimeter should be set out no more than 200mm away from the perimeter.
Using the toothed applicator (supplied), apply adhesive to the discs. Carefully line up the FF810 membrane and roll it out over the discs. Pull the membrane tight and then consolidate the bond, either by hand or with a roller / soft brush.
Adjacent rolls of membrane must overlap by a minimum of 50mm. The laps are then hot air welded with a heat gun to create a homogeneous, watertight seal.
Fatra FF810 reinforced membrane can also be mechanically side-lap fixed as an alternative option to the PVC fixing disc system. In this build-up, the membrane and insulation are secured independently.
When side-lap fixing, Fatra FF810 1.3m wide membrane must be used, with each sheet overlapping the adjacent sheet by 120mm. The fixings should be spaced at 150mm centres along the length of the roll and the edge of the washer should be no less than 10mm away from the edge of the membrane.
Insulation boards should be secured independently in a side-lap fixed installation. Use a tube washer with the appropriate fastener.
When fastening the membrane, use either an 82mm x 40mm steel plate washer or a 45mm diameter tube washer with a fastener. If using a tube washer, ensure a suitable tool is used to puncture the membrane: do not snip the edge of the roll.
Once the membrane has been fixed, roll the next section of FF810 membrane over the sheet that has been secured, carefully lining up the membrane to achieve a 120mm overlap. This provides enough space to cover the fixings and to achieve a full hot air weld.
Side-lap fixing should also be used for all vertical upstands greater than 600mm in height.
| Reference | Fatra FF810 | Fatra FF810V |
| Roll width | 1,300mm | 2,050mm |
| Roll length | 20m | 20m |
| Thickness | 1.5mm | 1.5mm |
| Area | 26m2 | 41m2 |
| Ron weight | 52kg | 82kg |
| Unit weight | 2.0 kg/m2 | 2.0 kg/m2 |
| Rolls per pallet | 19 | 21 |
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