The rubber gasket that surrounds the vent pipe could be rotted.
Plastic shed leaking roof.
Often water runs to openings in the vapor barrier such as at ceiling light fixtures.
Hopefully it hasn t come to this but if you leave a leak for a long time then not only will the osb need replacement your roof rafters will too.
Does the shed leak.
Some roof leaks are tough to locate.
Check plumbing vent boots and roof vents if water is entering from that area to cause the leaking roof.
If you originally bought it at home depot go there with the measurement of your roof.
If this is the case it isn t always mandatory to replace the entire roof.
To avoid seepage around the bottom of the shed apply silicone to the outside or inside of the u channel that runs along the bottom of the shed.
The shed will not leak but after installing the roof you will need to apply silicone along the running edges of the roof ridge caps and around the washers on the roof plugs.
Removing the roof sections yesterday the problem is that one of the eight roof panels no longer locks properly into the central beam roof light running the length of the shed no matter what i do with it.
Have a keter 8x8 apollo plastic shed.
You ll have first to fix the sheathing so see above.
Sometimes the water shows up at a ceiling spot distant from the leak.
Either one you can secure with sheet metal screws and then put sealant over those and the seams and you ll be good to go.
If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic.