Alterna is a fibre cement slate with a smooth surface, straight eges and a matte coating. Alterna quadrangular has 4 right corners. Alterna has a warranty of 30 years on the intrinsic qualities, 15 years on a homogenous and consistent evolution of the appearance and 10 years againt appearance of lichens.
Flat surface
Straight edges
Suitable for all volumes
Different colours and sizes
Roof and façade