Both 16 inches and 24 inches are common measurements for rafter spacing.
Support spacing for corrugated sheets.
Subtract that number from the width of the panel and then divide by 2 to come up with the spacing for the rafters.
For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap.
It often depends on the wideness thickness and the types of roofing materials the climate it has to withstand and many other factors.
Rain fall capacities data.
Corrugated sheet roofing material is widely available and easy to use.
These purlins or cross members are spaced a as per the chart fig.
5 7 wp corrugated sheets are installed on structurally sound support members that are positioned at right angles to the direction of slope or water flow.
3 below to correspond to the design snow and or wind load pressures.
Corrugated roofing maximum support spacing data.
With pliers multi grips or a shifting spanner closed down to approximately 2mm grip the valley corrugations 20mm in from the end of the sheet and turn up as far as possible.
Be careful not to tear the sheet.