Roof Slate Contessa natural slate from Spain blue/black and grey

Contessa natural slate The best natural and man-made slates the world has to offer are available from Cembrit. Cembrit are members of the Cembrit Holding A/S Group of Denmark, one of Europe’s major building material producers with over 80 years experience in the manufacture of fibre reinforced cement products for the roofing and cladding industry. Using skills built up in over 80 years, Cembrit select natural slate from Spain, Canada, Brazil and the countries of Western Europe. From UK quarries, Cembrit offer Welsh and Westmorland slates. A range of recommended accessories is also offered. Contessa...

Appearance Contessa slates are available in a variety of sizes, in blue/black and grey. Both colours are classified as having a normal texture according to BS EN 12326. General design considerations Contessa slate is a tough natural material and samples are regularly tested to the following national standards: Contessa slate laid to BS 5534 will meet the strength requirements for the imposed and uniformly distributed wind and snow loads etc. The site exposure rating and the pitch of roof rafters will determine the size, pattern, lap and fixings for the slates. For UK and Northern Ireland locations,...

Contessa Tables Table 1 Moderate exposure less than 56.5 l/m2 per spell Table 2 Severe exposure greater than or equal to 56.5 l/m2 per spell - In general, the recommendations below apply to rafter lengths of not more than 9m. The specifier should also take account of any abnormal local conditions that might apply. - In general, the recommendations below apply to rafter lengths of not more than 6m. The specifier should also take account of any abnormal local conditions that might apply. Slate Size Minimum headlap Batten gauge Holing gauge Average weight Slate Size Minimum headlap Batten gauge...

Sitework Storage and handling Slates should be carefully stacked on their longer edges with timber bearers, battens or boards between layers. The lowest layer must be arranged on a firm level base. Working Slate can be cut and holed on site by hand or machine. Care must be taken to avoid undue spalling. Slates should be holed from the bed towards the face so that the nail-head is accommodated in the small cavity formed by the area of spalling. Individual slates should be holed so that the thicker end is at the tail of the slate. Before fixing, the slates should be sorted into three or four groups...

The information contained in this publication and otherwise supplied to users of the company’s products is based on the company’s general experience, best knowledge and belief. However, because of factors beyond the company’s knowledge and control, which can affect the use of the products, no warranty is given or implied with respect to such information. The company’s policy is one of continuous improvement. Cembrit Limited therefore reserves the right to alter specifications at any time and without notice. 57 Kellner Road London SE28 0AX As with all natural materials, colours and textures of...