Mechanically attached single ply - synthetic roof membrane systems
Mechanically attached single ply roof systems are applied on various building types, such as shopping centres, logistic centres, schools, hospitals and many more. Would you like technical information about the possibilities of this way of mechanical fastening? This article will get you started quickly!
Mechanical fastening methods fasten the roof membrane to the substructure by a screw and a pressure plate - often through the insulation layer. This is also called a “warm roof” construction, which consists of a roof floor, vapor barrier, insulation and on top of that a plastic roof membrane.
Mechanical fastening is a popular roof system: mechanical fastening is chosen for about 50% of the roofing business. Other options are ballasting and full or partial bonding.
Mechanically attachment of single ply roof systems
The single ply reinforced synthetic roof membranes are applied with an overlap of approx 100/120 mm. The producers of synthetic roof membranes manufacture their membranes in different widths. Wide rolls of 2 metres or more are used for roof zones with the lowest wind load. In perimeter and corner zones, smaller membrane widths are used to resist the higher wind loads in these zones better.
The synthetic membranes are welded with hot air, with a 40-mm wide welding seam in the overlap. The remainder of the overlap, 60/80 mm, is used for the mechanical fastening of tubes that fasten the roof build-up to the roof structure. The number of fasteners per m2 is determined by the actual wind load of the roof according to the European wind load standard EN 1991-1-4.
Do you need help calculating the wind load? Our technical support will get you started quickly.
Guardian fastening solutions for synthetic roof membrane systems
Guardian offers a wide range of pressure plates and plastic tubes for the safe fastening of synthetic membrane systems, both on soft and hard substrates (insulation). The standard range of Guardian overlap fasteners has design load values of 500-700 N/fastener, depending on the type of membrane. The high-performance range from the Guardian range achieves design load values as high as 700-900 N/fastener!
The design load values for each membrane - plate/tube combination has been determined on the basis of full-scale wind uplift tests according to EN 16002 testing method.
Guardian standard overlap fasteners for synthetic roof membrane systems:
- SP 40 membrane plate, flat and recessed design
- SP(A) 8240 membrane plate, flat and recessed design
- R45 membrane tube washer
- SP 50 membrane plate, flat and recessed design
Guardian high-performance overlap fasteners for synthetic roof membrane systems
- Fastener: RB 48
- Induction technology: GuardianWeld Inductiesysteem
Material
Reinforced PVC, thickness 1.2-2.0 mm
Reinforced TPO/FPO, thickness 1.2-2.0 mm
EPDM, thickness 1.1-2.1 mm
Common roof membrane widths: 1.0/1.5/1.6/2.0/2.1 meters
Alternative for overlap fastening: induction welding technology
An alternative to overlap fastening is the method with which the roof membrane is bonded to specially developed pressure plates using induction welding technology.
In this case, the overlap width will be 60/80 mm. The pressure plates are not applied in the overlap but on the insulation material according to a predetermined pattern (field fastening) depending on the wind load. The membrane is then rolled out across the roof. Each plate is bonded to the bottom of the membrane using induction welding equipment (GuardianWeld), without perforating the roof membrane.
Discover the best fastening solution for your project
Guardian's experts are ready to assist you with your project. This way you will be sure that you are making the right choice in your fastening solution.
