different applications probably 18:36 Dec 27, 2011
fixing screws are for securing decking panels to purlins.
stitching screw for the EPDM membrane and top hats to decking panels. Although there is no mention as to how stitching screws are used. I'm guessing they're for fixing EPDM membrane (edges)
The two decking panels will be secured to the purlins with the use of the nominated fixing screws at the appropriate centres through the trough of the panels.
4. A series of top hat sections will be attached to the decking panels at the appropriate centres using the nominated fixing screws. |