Subtract that number from the width of the panel and then divide by 2 to come up with the spacing for the rafters.
Support spacing for corrugated sheets.
For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet.
It often depends on the wideness thickness and the types of roofing materials the climate it has to withstand and many other factors.
3 below to correspond to the design snow and or wind load pressures.
Corrugated roofing maximum support spacing data.
These purlins or cross members are spaced a as per the chart fig.
Be careful not to tear the sheet.
Corrugated sheet roofing material is widely available and easy to use.
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.
Rain fall capacities data.
Corrugations should run.
Both 16 inches and 24 inches are common measurements for rafter spacing.