27 April 2017

How to calculate the load per screw on decking

Our hot-finished range to EN 10210 fits this bill perfectly. is widely recognised as the default for hollow sections across a broad range of construction and structural applications, and to make sure it remains there.


Fasteners are a vital component to ensure the safe installation of structural decks or trays. The correct fixing, to be specified by the fastener manufacturer, to suit the application of fixing to cold rolled thin gauge purlins, hot rolled steel sections or timber supports. Self drilling/self tapping screws (commonly known as drill screws), must be a minimum 5.5mm diameter, available in carbon steel or austenitic stainless steel, and must resist all pullout, pullover and shear forces.

how to calculate the load per screw on decking

The load acting on a screw can be calculated thus:-

Screw Load (kN) = Wind Load (kN/m2) x Support Centers (m) x Screw Centers (m) x Factor of Safety

Example:- To find the fastener load for D60 deck spanning 3000mm with an applied wind load of 1.5kN/m2
Screw Load = 1.5 x 3 x 0.2 x 2 = 1.8kN

Fastener manufacturers can confirm:-
Pullout, pullover and shear values, to suit gauge of deck / tray, type and thickness of support structure, and provide information on the correct torque setting for screw guns, to ensure that the screw is not over-driven or under-driven.

how to calculate the load per screw on decking


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