h NVS well above optimal range *
Top Hat not collapsed , not snug against steel deck and not clamping deck sheet to base steel
Figure 11a : Under driven X-HSN 24 fastener with single sheet to base steel h NVS within optimal range *
Top Hat properly collapsed , snug against steel deck and clamping deck sheet to base steel
Figure 11b : Properly driven X-HSN 24 fastener with single sheet to base steel h NVS well below optimal range *
Washer cutting into deck sheet , deforming base steel and deck sheet
Figure 11c : Over driven X-HSN 24 fastener with single sheet to base steel
* Optimal stand-off ( h NVS ) range for the X-HSN 24 fastener is 5 mm ≤ h NVS
≤ 9 mm .
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