Solar Installation · Tape Measure

Rail placement
on the roof

Choose how many panels you are mounting and get the exact position — along the tape measure — to mark each rail. You always measure to the left side of the rail (green line); the red dot is the centre.

6
16121824
long side (landscape)
horizontal spacing
half = 72,5 mm
rail centre from outer edge
correction of the centre line
affects the view only

01Scaled marking view

Rail centre Measure line (left side) Tape measure
← drag to see the whole row →

02Calculations per panel

03Formula

For the next panel, add the step P + G to each line.

04Lines to measure to along the tape

No.PositionRailMeasure to (mm)

Each value is the distance from the start (0 mm) to the left side of the rail. Lay out the tape, mark the point and align the left edge of the rail with the mark.

05Summary

06Rail profile (top view)

We measure to the left side; the centre (red) is 72,5 mm away.