CUPA HEAVY 3 A ROOF FOR LIFE
CUPA HEAVY 3™ slate is quarried from the Group’s No3 quarry in San Pedro de Trones (Leon) in northern Spain. This quarry has been in operation since 1892 and produces some 25,000 tons each year. The slate is blue black with a slightly gritty texture, and in some samples well defined parallel lines are clearly visible on the cleavage surfaces.
Slate from the San Pedro quarry is produced in two thicknesses, 3.5mm and 7-8mm; the thicker variant being the preferred choice in Scotland. The extra thickness and weight give it strength to withstand the high wind speeds and driving rain common throughout Scotland.
It is ideally suited for the Scottish market due to its close similarity to the traditional highland slate from Ballachulish that is no longer produced. Both are blue black in colour and of similar thickness, and pyrite crystals are usually present in both.
CUPA HEAVY 3 IS THE BEST CHOICE FOR REPAIR AND REPLACEMENT OF TRADITIONAL ROOFS IN SCOTLAND.
The inclement weather in these markets means that thicker slate is needed to protect buildings from dampness through capillarity and also from the high winds that prevail in some parts of Scotland. Capillarity refers to how easily a liquid can rise through a pore. It is a physical phenomenon and therefore it is not limited to slate and affects all overlapped laminated materials. Heavy 3 at a thickness of 7-8 mm is ideally suited to combat dampness which has resulted in it being widely used on conservation projects.
THE VALUE OF HEAVY 3 LIES IN ITS PROPERTIES
CUPA HEAVY 3 FORMATS
CUPA Heavy 3 natural slates are available in the following sizes:
- 30x20cm (12x8”)
- 35x20cm (14x8”)
- 40x20cm (16x8”)
- 40x25cm (16x10”)
- 50x25cm (20x10”)
You can download the technical drawings of each systems in CUPAPRO