How this node works
The panel is screwed to the purlin through the top of a rib, with a sealing cap; the side lap is a tongue-and-groove joint, often gasketed, so the through-fixing and the joint both stay watertight.
Key points
- Profiled outer sheet
- Insulating core
- Inner sheet
- Screw + sealing cap (on the rib)
- Tongue-and-groove joint + gasket
- Purlin
Conceptual, language-neutral drawing for study and orientation — not an execution drawing. Dimensions and verifications belong to the designer.