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.
Lowest pitched concrete roof tiles.
Our melodie interlocking clay pantile can be used in roof pitches as low as a 12 5 our wessex and mendip concrete roof tiles can be used down to a minimum 15 pitch.
Concrete tiles are a popular choice for pitched roofs across the world providing an attractive and robust solution which keeps costs under control.
Stuart nicholson director of roof systems at marley outlines how best to approach the preparation and specification of tiles for low pitch roofs.
What are the minimum pitches for clay or concrete tiles.
Decra classic these are coated zinc aluminium galvanised steel tile panels with the appearance of traditional concrete roof tiles.
Previously it was accepted that 35 was the lowest recommended pitch for both concrete and clay variants of the tile.
The irc recommends a minimum pitch of 2 5 12 for these materials.
Ratios from that minimum up to 4 12 which are considered low pitch require double underlayment.
With the introduction of machine made clay tiles this has now dropped slightly to 30 similar to the marley hawkins single camber tile.
Concrete is long lasting with a minimum lifespan of 50 years depending on climate.
Additionally there are some concrete tiles available that can be laid as low as 10 although these are not too commonly used.
As a general rule 15 is the minimum pitch for concrete tiles which has decreased from the original recommended level of 20.
Clay tiles are colorfast which means their tints improve rather than fade over time.