Our slates are usually delivered on a Six Wheeled Lorry (11m Long & 2.4m Wide) with a Tail-Lift facility to off-load on solid level ground with a Pump Truck. Non compliance to delivery restrictions may result in additional Delivery Charges. Should you specifically require Crane Off-Load or small vehicle please notify us at the time of ordering, as an additional charge may be incurred. Please allow 5% extra in the ordered quantity to cover acceptable Breakage in transporting Natural Slate Products. Roofing Superstore slates are a tough natural material and samples are regularly tested to the following national standards: British Standard BS EN 12326-1:2004 Product specification for roofing slate. Exhibited the top Class A1 for water absorbtion Exhibited the top Class T1 for thermal cycle resistance. Exhibited the top Class S1 for sulphur dioxide exposure resistance. Good flexural strength both transversely and longitudinally. Acceptable non-carbonate content. Properties Most slates have a secondary plane of cleavage or grain which can only be determined microscopically.However this grain should not be confused with the texture which can be seen on the surface of the slate which is influenced by the direction in which the slate is split with a chisel, either from the top or the side.Roofing Superstore slate has a normal texture using the classifications detailed in BS EN 12326, and consistent thickness, between 4-6mm, which will contribute to an even looking roof slope. Approximately 20 slates per m2 Delivery Notes - Our slates are typically delivered on a six-wheeled lorry (11m long & 2.4m wide) with a tail-lift facility to offload on solid, level ground with a pump truck.Non-compliance to delivery restrictions may result in additional delivery charges. Should you specifically require a crane or small vehicle offload, please notify us at the time of placing the order, as an additional charge may be incurred. Please allow 5% extra in the ordered quantity to cover acceptable breakage in transporting natural slate products