Leaking galvanised roof

Old Perry

Hi, I have a shed with corrugated galvanised roof. It's leaking through onto to joists. Any suggestions how I can fix this or should I get someone in to have a look.
Thanks.

the_pen_turner

What pitch is the roof,
Have you felt
Is it in one spot or all along the timber
Is it multiple timbers
Are the sheets full length
Screws or nails
How close is this to the end of the sheets

The Continental Op

Plus is this and isolated hole or due to general rust?

Old Perry

Hi. Pitch is less than 10°, rises no more than 2ft back to front.
No felt, think held with carriage bolt/ screw but I can't be sure.. there is rubber washers.
Multiple timbers but worst on the one higher/ closer to the front.
At worst Leakage covers approx a half of the timber, measured from middle with ends being dry.
Leak is isolated along timber. Thanks

the_pen_turner wrote: »

What pitch is the roof,
Have you felt
Is it in one spot or all along the timber
Is it multiple timbers
Are the sheets full length
Screws or nails
How close is this to the end of the sheets

Old Perry

The Continental Op wrote: »

Plus is this and isolated hole or due to general rust?

Not isolated and no clear hole as such, I think it's seeping in around screws/ fixings. No rust.

I'll try get a picture but I don't get home till late the next couple of days.

the_pen_turner

If its nails with a rubber washer then they have loosened bait or the rubber is perished. I would take them out and drive long tech screws into the timber. The longer the better withings reason. Stop about an inch above the roof and put a squirt of tech 7 silicone around the screws to seal any irregularity and drive the screw home. Use enough to get a small bead squeezing out

Old Perry

Sounds like a plan. I have 125mm tech screw but I reckon their a good bit thinner than what's already in. Will have to see.

the_pen_turner wrote: »

If its nails with a rubber washer then they have loosened bait or the rubber is perished. I would take them out and drive long tech screws into the timber. The longer the better withings reason. Stop about an inch above the roof and put a squirt of tech 7 silicone around the screws to seal any irregularity and drive the screw home. Use enough to get a small bead squeezing out

The Continental Op

If its tiny gaps and that the water is wicking into then I use this strangely named stuff Captain Tolley’s Creeping Crack Cure. It would do under washers that looked tight but might otherwise be leeking. If there is a gap the stuff creeps into it.