Leaking roof. Can't tell where it's coming from.

Elliot_holder · 31 Aug 2015

Hi all,

Newbie to the forum so please be gentle.
Have had an ongoing issue with my roof. Went up there, spotted a cracked tile and replaced. Easy fix or so I thought!

Then after leaking again I had a roofer around who said it's probably the valley leaking, so got him to remove and refix the valley mortaring back either side level with tiles.

Couple of weeks later in the first down pours, and I have a leaking roof again.
Can't for the life of me work out how it's leaking. Any ideas?

noseall · 31 Aug 2015

Not from those images no.

joe-90 · 31 Aug 2015

Go into your loft when it's raining and see where the wet bits are.

noseall · 31 Aug 2015

joe-90 said:
Go into your loft when it's raining and see where the wet bits are.

All that will do is show where there are nail holes in the felt.

Elliot_holder · 31 Aug 2015

Yea that's my problem. Holes in felt are easily spotted and are where it's been nailed.

Although that helps narrow down the issue I'm just stuck seeing any obvious issues from on top of the roof and don't really fancy taking a loads of the tiles off to try and find it.

Suspect that's what I'll have to do in the end, but was hoping it would be one of those jobs where it would be a relatively easy fix. Unfortunately they never are.

joe-90 · 31 Aug 2015

It's often a leaky ridge tile and the rain runs down the felt until it finds a nail.

noseall · 31 Aug 2015

The problem is that there is a large area of tiling that ultimately collects in that valley. It could be leaking in a number of places other than the valley but collecting and leaking in at the first vulnerable spot lower down the valley.

noseall · 31 Aug 2015

joe-90 said:
It's often a leaky ridge tile and the rain runs down the felt until it finds a nail.

With the ridge being the highest point, water admittance is usually only a small amount unless the fault or hole is huge.
Not unusual though.

^woody^ · 31 Aug 2015

With valley leaks, it never tends to be just the valley, but the felt 1m or so each side that needs re-doing. And the bit at the ridge.

cotswoldbuilders · 31 Aug 2015

Looks more like a slate valley, the tiles do not have enough lap over the valley.

ree · 31 Aug 2015

"Have had an ongoing issue with my roof" - how long, the roof tile appears to have been there for some time?

If the roofer lifted the tiles necessary to remove, examine and replace the GRP Trough: then how come there's moss plugged between tiles that should have been lifted?

The GRP valley trough has channels with ribs at each side - the channels are supposed to be kept free of the pointing (mortar).

There should be valley boards under the GRP trough.

A length of underfelt the width of the valley boards should be run the length of the valley.

Your loft pic appears to show dangling and heavy sagging of the roof underlay - the dangling underlay has ragged edges.

If you post pics showing more context in the loft, and up the valley then things might become clearer eg its hard to tell whether thats the correct GRP Trough for your situation?

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Leaking roof. Can't tell where it's coming from.

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