Previous roofing repairs advice

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We had multiple roof repairs done in 2024, and everything seemed fine until winter.

When there was some extreme and freezing weather conditions water had been managing to get in at the valley which had been redone. The roofers came back to have a look but said they couldn't see anything wrong. It had been fine again after that until freezing weather this winter and the same thing had happened again.

We had different roofers come have a look recently, and they said it's because they didn't put the underlay properly beneath the valley as well as the tiles.

I thought the underlay was essentially as a backup and that water still shouldn't have been getting beneath the tiles - but from research it would seem that this backup also includes for harsh weather conditions where water can force it's way between tiles? So perhaps the other roofers who came are right.

Not really sure what we can do though - as the repairs didn't come with a guarantee. To add the underlay would mean taking up and redoing the whole valley again! There's also the question of whether we'd really want the same people back if they didn't do it right the first time?

Would rather get it fixed sooner than later to prevent further damage if we get more harsh and freezing weather. Maybe better getting different roofers? Seems unlikely to me the original roofers would redo it for free anyway.

Any general input appreciated!
 
Not really sure what we can do though - as the repairs didn't come with a guarantee
All repairs come with a 'guarantee', whether written, verbal or implied under law

If the work has been done incorrectly and that can be demonstrated, you would have up to a potential six years under the Consumer Rights Act 2015 to make a claim against the installer.

If the "roofers" are still about and you think there is a good chance that they would be worth claiming against, you can do that and make a claim in the County Court.

Otherwise, if the opinions of several other roofers concur, then you'll need to go with one of those.

FWIW, interlocking concrete tiles do leak and do need an underlay. Clay or concrete plain tiles (and slate) do not leak and do not need an underlay, although current standards require one to be fitted.
 
Exposed metal in freezing conditions will cause water to drip on the underside. Can you not line it from the inside?
 

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