In a mechanically-fastened system, the horizontal level is mechanically fastened. The number of fasteners depends on the wind uplift requirements. Wind uplift is influenced by different elements:

1. The roof is always divided up in different areas:
   • Central area
   • Edges
   • Corners
   • Other turbulent areas
2. The building:
   • Height
   • Length
   • Width
3. Location of the building:
   • Coast
   • Countryside
   • Urbanised or forested
   • City

These details determine the number of fasteners. Starting point is always that turbulent areas, corners and edges will be better fastened than middle part. The higher the builing, the better the flange must be fastened. In this system, vertical layers are also fully-adhered with Carlisle Bonding Adhesive 90.8.30A. The adhesive always must be applied to both sides! Apply adhesive evenly without globs or puddles to achieve continuous coating of both surfaces! Also install Carlisle Russ strips at every angle change and all flashings. This mechanical system allows work on any dry and dust free substrate. The specific characteristics of the substrate require attention: compression resistance, brittleness temperature, longevity and thermal stability. Attention will evidently be made to pullout values/withdrawal resistance criteria for required fasteners in the different substrates: (steel, wood, structural concrete and cellular insulating concrete). If you want to be absolutely sure about the maximum wind uplift resistance on your roofing system, our services can conduct on-site test to determine actual pullout values!