Leaking Roof

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My house came with a recently built (~7 years) extension.

I've had a couple of leaks from the roof - earlier in the year I pulled a couple of tiles off, found a hole in the felt, patched it and all good.

Unfortunately, it's come back (from somewhere else). Not "leave a bucket on the floor", but enough to slowly damage the plaster.

I subsequently realise that it's not the felts job to keep the water out, and I probably have a bigger problem.

The red patch is where water is appearing in the ceiling.

6W28QoQ.jpg


From the room below.

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From in the loft - although I can see where the waters going, I can't see where it's coming from

CFuJAcv.jpg


Tiles detail (Marley Duo)

Ao5HMQP.jpg


Roof construction (black stuff is the sealant I used to patch the hole)

2bLrT2R.jpg


I called a roofer who came round and set the installation was all wrong and I needed a new roof.
After a little more discussion he said he'd come back the next week and take some tiles off and have a proper look to see if there were any other options.
That was four weeks ago and radio silence...

I spoke to another one who again said the installation was wrong (specifically - incorrect tiles for pitch) and suggested a re-roof.
They suggested coming out to have a look, but again they seem to have gone quiet.

So it looks like a nice simple life of paying someone is out the window...
I dread to think how much a re-roof would cost, so I'm reluctant to shell out £,£££ on the basis of a quick conversation - I'm hoping that's not the only option.

One suggestion was that the outlet on the gutter of the roof above is just draining onto the roof below, and maybe water is getting under the tiles there - it's in line with the damage on the ceiling.

Alternatively, I could take a strip of tiles going up the roof off and see if I can see anything else.

Any other ideas?
 
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An independent building survey might identify the problem.

The tiles do not appear to be staggered.

Is there a pic of where the new roof meets the wall of the existing house?

Blup
 
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Apparently there is no need to stagger these tiles because the overlaps automatically seal the side joints.

Acceptable tile pitch is influenced by the headlap so that might be the installation factor the roofer was referring to, and in principle was therefore sound advice.

However having seen the damage that an overflowing gutter can do, I would sort that out first, and it may well solve the damp problem.

Blup
 
Can you post a pic of the gutter outlet, including the top two bonnet tiles which seem to be a different colour and therefore possible replacements.

Blup
 
Waterchecks/channels/interlocks are often the weakest part of a tile.
Duos or whatever they are should be brick bonded to allow the Watercheck to sit on solid tile.
Headlap suspect but sealing gaps in tiles I wouldn't advise as any water that reaches above will have no exit
 
As above , they should be broken bonded , which they are not.
Headlap is way less than it should be.
Flashing , a waste of time. Rip it off and used lead or a suitable alternative.
A very close up of the detailing around the top of the hip would be interesting too
 
As above,
plus, in pic 3 the lower membrane seems to have been taken over the higher membrane - instead of the higher membrane overlapping the lower membrane.

The lower courses seem to be installed with a wrong, straight bond, and the upper courses with a correct, broken bond.

Off page but is that the ragged edge of the main roof membrane peeping out under the main roof gutter?
 
Off page but is that the ragged edge of the main roof membrane peeping out under the main roof gutter?
Yes. I don't think it was installed square so some of it sits in the gutter - in fact around the corner water actually flowed over the side of the gutter because of it.
As above,
plus, in pic 3 the lower membrane seems to have been taken over the higher membrane - instead of the higher membrane overlapping the lower membrane.
I'm not 100% sure I understand, but if you think it's more than one sheet, it looks to be one sheet just with some ruffles in it, I couldn't see a join from inside the roof.
Can you post a pic of the gutter outlet, including the top two bonnet tiles which seem to be a different colour and therefore possible replacements.

Blup
This is a more up-to-date picture - I added a straight drop on with a straight edge - I'm wondering if thats actually made it worse as the water is now more concentrated on one area.

IMG-0473.jpg
 
The top hip tiles look like they might have been the source of water ingress.

Blup
 

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