Description
A typical roof sheeting expansion joint detail, drawn at 1:10, showing how long runs of metal roof sheeting are broken to allow for thermal movement. The section runs the sheeting over the roof purlins and rafter, steps the two sheets past each other with a 15mm drop and a 300mm overlap, and notes that the covering flashing is omitted for clarity – the arrangement that lets the sheets expand and contract without buckling or tearing the fixings.
Long metal roofs need these joints at regular centres, and this annotated detail gives you a ready standard to trace or paste into your roofing and structural steel drawings, then adjust the gap, lap and purlin spacing to suit the sheet profile and run length.
Find more like it in the structural details and steel categories. A free AutoCAD DWG download.
