Tiles for a shallow angle roof

[addey]

We had an extension built about 12 years ago and part of the roof is a very shallow angle, between 10 and 15 degrees. It was built like this to match the neighbours extension which was built a few years previously and it is tiled with concrete interlocking tiles. Unfortunately its leaking quite badly, mainly around one of the velux windows (at least that is where it is showing internally). A roofer came and had a look and basically said the whole roof needs replacing as the tiles are the wrong type and he has quoted to replace with Alwitra VSK. He also implied that if the roof was being built now then building regs wouldn't even allow tiles for that pitch.

So my question is, can this pitch of roof be re-tiled? I'm planning to get another quote or 2, and if they quote to re-tile then I'd like to know if this is an appropriate solution. Alwitra (or similar) may well be the best solution but it was quite expensive!

[PhilboSE]

It depends on the tile.

Standard tiles good for about 35degree pitch.
Slate good to about 25 degrees.

For less, and certainly 10-15 degrees, you need a product specified for that pitch like Marley Mendip 12.5

Or, a different product like zinc/alu/lead.

First find the pitch accurately - the app on your phone is surprisingly good. Then try and find what product you have at present.

You don’t say if you have identified the nature or reason for the leaks - it might be the right product you have, but bad detailing.

[Chumley.mouse]

We have a 15 degree pitch with Marley Modern’s on it’s was built in 79 , we have a couple of velux too …. No issues in the 7 years we have been here .

17.5 is the minimum pitch for those tiles now.

Sounds like you just have a leak somewhere around / above the velux.

[paulwirral]

Marley Wessex or similar go down to 15 degrees , increase the headlap and they should be ok a bit lower as long as your not involving building control !
Or felt it flat roof style and counter lath then tile in with whatever you want just for aesthetics

[wolfracesonic]

You can get tiles to cope with that pitch but the weak link will still be the Velux, standard ones will go down to around 20°, though Velux will kindly sell a version designed to go lower. Has the issue started recently or from the get go? If recently, one of the problems older Velux suffer from is that the foam upstand/gasket the tiles sit on can degrade letting in wind driven rain; I’ve fixed a few that suffered from this, Velux actually selling replacement self adhesive foam strip repair kit. Might be worth a second opinion.

[POIDH]

Replace with a metal roof?

[swanny71]

This spring we had all our roof tiles replaced with Mayan armour slate.
(We also has leaks around Velux windows).

https://mayanroofingsystems.com/system/armouredsla...

Its natural slate bonded to a GRP backing plate that works for roof angles down to 10 deg (our roof is mostly 15deg).

More expensive but indistinguishable from traditional slate (to my eye) when finished. Very happy with the results and the roofers said it’s a doddle to fit, they also sourced a specific low pitch install kit for the Velux windows which wasn’t used originally.

[bobtail4x4]

strip the tiles,
board felt and counterbattern,

replace tiles after sorting flashing to velux,

[Lotobear]

POIDH said:

Replace with a metal roof?

You could - Britmet or Metrotile go down to 10 degrees but they look a bit 'low rent' with their 'park home' / travellers lodge vibe.

[Aluminati]

https://www.bmigroup.com/uk/p/regent-tile-tudor-br...

[POIDH]

Lotobear said:

POIDH said:

Replace with a metal roof?

You could - Britmet or Metrotile go down to 10 degrees but they look a bit 'low rent' with their 'park home' / travellers lodge vibe.

I meant more like this:

[OutInTheShed]

you can build a roof such that all the tiles really do is keep the sun off the actual waterproof layer.

Alternatively, you can get big sheets of GRP fake slates and tiles.

Only takes one bad detail to let the rain in.