Reroofing options for leaky cambrian tiled low-pitch roof

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We are having our whole property (semi-detached) reroofed. As well as the main roof we have a low-pitch roof (~15 degrees) over a one story kitchen extension. This roof currently has cambrian interlocking tiles on with several velux windows. We have been having leaks around one of the velux windows, though this mainly seems to have been an issue with the flashing higher up the roof, as after we covered this with flashband, it stopped the leak except in driving rain. The extension roof was done fairly recently (around 8 years ago) but before we owned the house. It does needs sorting though as in addition to the leak it has been damaged by the scaffolding required for the main reroofing. The current headlap on the cambrians is also only ~65mm which is below the recommended 75 mm for the roof pitch and may be the reason for why driving rain causes leaks. Our primary concern is having a non-leaky roof, though we also want it to look nice!

The main roof has been done with SIG fibre cement slates, no problems. Our roofer initially suggested using these for the low-pitch roof as well, though on investigation it seems they are only suitable for a pitch down to 20 degrees. Our initial preference was to have the low-pitch roof redone with cambrians, but our roofer said there are supply issues with the cambrian tiles at the moment but also that he would advise against using these anyway as they are difficult to maintain and to replace tiles. I have also noticed threads on this forum from people with problems when these tiles are used on a low-pitch roof. An alternative suggestion was the crest *planum concrete flat tile, but we are not very happy with the look of these compared to what we have at the moment and we are also worried they may reduce the value/appeal of the house.

We would be grateful for any thoughts on alternative options for covering this low-pitch roof, as well as our impression on the situation as it stands (functionality of cambrian interlocking tiles and mixing concrete and artificial slate tiles on different parts of the house).
 
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Hi,

From previous suggestions I have seen on here, it may be an idea to sort the roof properly with an EDPM membrane or similar.

You can then cover it in a slate or tile of your choice, without worrying about pitch.

If your original tiles are in a decent condition they could be reused to save money.

An example here:
https://www.roofingkitsdirect.co.uk...ched-roof-where-i-need-to-have-a-tiled-finish

I hope that helps! :)
 
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We are having our whole property (semi-detached) reroofed. As well as the main roof we have a low-pitch roof (~15 degrees) over a one story kitchen extension. This roof currently has cambrian interlocking tiles on with several velux windows. We have been having leaks around one of the velux windows, though this mainly seems to have been an issue with the flashing higher up the roof, as after we covered this with flashband, it stopped the leak except in driving rain. The extension roof was done fairly recently (around 8 years ago) but before we owned the house. It does needs sorting though as in addition to the leak it has been damaged by the scaffolding required for the main reroofing. The current headlap on the cambrians is also only ~65mm which is below the recommended 75 mm for the roof pitch and may be the reason for why driving rain causes leaks. Our primary concern is having a non-leaky roof, though we also want it to look nice!

The main roof has been done with SIG fibre cement slates, no problems. Our roofer initially suggested using these for the low-pitch roof as well, though on investigation it seems they are only suitable for a pitch down to 20 degrees. Our initial preference was to have the low-pitch roof redone with cambrians,
Marley 'Mendip' smooth will go down to 15 degrees with a 100mm headlap. No shallow pitch roof (below 17.5) will have minimum headlap 75mm. Always 100mm.
 
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