DESCRIPTION

Approx thickness: 6mm
Colour: Blue/Black
Texture: Smooth
Sizes Available: 500x300, 500x250, 400x250, 400x220, 400x200, 350x250, 350x200, 300x200, 300x150
Grades: Best and Standard
Pre-holing: Slates are generally available pre-holed to provide a 75-90mm lap, however slates can be supplied to alternative laps or un-holed for hook fixing
Slate and Half: Available Un-holed
Approx Weight: 36kg/m2 based on 500x250 laid to a 75mm lap

DESCRIPTION

Approx thickness: 5mm
Colour: Blue/Grey
Texture: Riven
Sizes Available: 600x300, 500x300, 500x250, 400x250
Grades: Best only
Pre-holing: Slates are generally available pre-holed to provide a 75-90mm lap, however slates can be supplied to alternative laps or un-holed for hook fixing
Slate and Half: Available Un-holed
Approx Weight: 30kg/m2 based on 500x250 laid to a 75mm lap

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Fixing: Stoneleaf natural slates should be fixed in accordance with BS5534.
To achieve a neat and attractive finish, the company recommends the following:

• Mark out the slate joints on the batten, allow for 5mm gap between slates to allow for free drainage. We recommend that marks are made at least every third course.
• Each slate is to be fixed to treated softwood batten, size 50x25mm, with either 2 copper nails. 3.35mm diameter; nails should be of sufficient length to penetrate the batten by 15mm or stainless steel slate hooks nail type.
• Slates are split by hand and are subject to a variance in thickness. It is imperative that the slates, prior to fixing, are sorted out into at least three or four thicknesses.

The thickest slate used at eaves level, progressing to the thinnest slate at the top of the roof. Slates of the same thickness should be used in the same course. A small percentage of slates may be twisted, (more if Standard grade slate is used). These slates should not be fixed as they are likely to "kick up", however they can be cut down and used as an under-eave slate.
Roofing contractors who wish to obtain a more comprehensive step by step fitting procedure should contact our technical department.

Authority
Stoneleaf Spanish slates fully comply with all 3 parts of BS 680 (water absorption, wetting and drying and the optional sulphuric acid immersion test). The manufacture of Spanish slates is quality assured to BS EN ISO 9000.

Guarantee
Best Grade Stoneleaf Spanish slates are covered by a 75 year guarantee (Standard Grade slates 30 years).

Compatibility
Slate is compatible with other common durable building material, lasting the lifetime of the building itself.

Storage
Slates should be stored on dry level ground at a maximum of 2 pallets high. Loose slates should be stacked on their longest side on battens.

Accessories
In line slate vents - available to match all sizes either in plastic (riven slate finish) or natural slate made to order.

References:
BS 680 Part 1:1994 Part 2:1971 Roofing Slates BS 747 :2000 Specification Roofing Felts BS 4016:1997 Specification for flexible building membranes (breather type) BS 5534 Code of practice for slating and Tiling Part 1: 2003 Design BS 8000 Workmanship on building sites part 6:1990 Code of practise For slating and tiling of roofs and claddings BS 1202:1974 Specification for nails BS 6399 Part 2: 1997 Code of practice for wind loads Part 3: 1998 Code of practice for imposed rood loads BS 5250:1989 Code of practice for control of condensation in buildings BS 8104:1992 Code for practice for assessing exposure to wind driven rain

For further technical advice please contact our technical department.

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