500mm x 300mm Contessa 1st Quality Natural Roofing Slate - Grey 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 restrictio...Read More
500mm x 300mm Contessa 1st Quality Natural Roofing Slate - Grey
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.
Description
Pre-holed Natural Spanish Slate.
Contessa slate is 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.
Oxidisation
There is a potential oxidisation risk with all Contessa slates as their colour is determined by the presence of iron compounds and finely divided carbonaceous matter.
They also generally have more pyrite, which may or may not be visible on the surface of the slate.
Surface oxidisation of these metallic minerals may cause discolouration or staining of the slate.
This characteristic is permitted within the T1 classification.
Standard grade slates with a T2 classification may also discolour and stain slates in the courses below (please refer to table 3 of EN12326-1:2004).
Neither discolouration nor staining from oxidisation run off will affect the weatherproof performance of the roof.
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.
Contessa slate has a normal texture using the classifications detailed in BS EN 12326.
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