Leaks in Factory Roofs are often caused by poor attention to detail where Flues, Vents, Chimneys and other protrusions penetrate the Factory Roof.
Leaking Chimney in Factory Roof? –
Can be Permanently sealed in one of TWO main methods
Flat plates fitted over the sheets and tucked under the ridge is a Fool-Proof Solution
Dektite flashing kit systems are also very good
If you have a firm smooth surface to fix then to:
If you need to fix a Dektite to a fibrous sheet, first you must fit a GRP sheet: