Additionally there are some concrete tiles available that can be laid as low as 10 although these are not too commonly used.
Low pitch plain concrete roof tiles.
Forticrete centurion to my knowledge 10 is the absolute lowest you can achieve with a concrete tile and the forticrete centurion is the only one tested at this low pitch.
Edgemere interlocking slate is a large format concrete roof covering with a thin leading edge for a slate like appearance.
Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.
They can be used at pitches as low as 12 5 degrees with a headlap of 92mm with rafter lengths up to 6 metres.
It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5.
Concrete tiles and slates for low roof pitches.
For more information see our blog post on batten spacing for roof tiles.
Popular applications include extensions where windows or planning restrictions prevent the use of standard roof tiles.
Previously it was accepted that 35 was the lowest recommended pitch for both concrete and clay variants of the tile.
This means many of the tiles previously used on low pitched roofs for purely aesthetic reasons have improved in functionality.
Clay single camber plain tiles can pitch down to 30 manufacturer dependant although the vast majority available have a limit of 35.
With the introduction of machine made clay tiles this has now dropped slightly to 30 similar to the marley hawkins single camber tile.
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Types of tile recommended pitch.
As a general rule 15 is the minimum pitch for concrete tiles which has decreased from the original recommended level of 20.
Low pitch roof tiles are thought of as those that are suitable for laying on roofs at 20 degrees or less.