Minimum roof pitch*	22.5°
Size of slate	510 x 255 mm
Cover width	255 mm
Profile depth	6 mm
Weight per 1000	1.3 tonnes
Weight per slate	1.3 kg
Weight per crate (including pallet/packaging)	1.4 tonnes
Quantity per crate	1000 tiles
Batten size - up to 600 mm rafter centres	50 x 25 mm
Nail type/size for slates	38 x 2.75 mm copper clout head

* Note: Unless otherwise stated, data is based on slates laid at minimum headlap

Britslate Duchess 610 x 305 - Technical Data

Minimum roof pitch*	20°
Size of slate	610 x 305 mm
Cover width	305 mm
Profile depth	6 mm
Weight per 1000	2.0 tonnes
Weight per slate	2.0 kg
Weight per crate (including pallet/packaging)	1.5 tonnes
Quantity per crate	750 slates
Batten size - up to 600 mm rafter centres	50 x 25 mm
Nail type/size for slates	38 x 2.75 mm copper clout head

Note: Unless otherwise stated, data is based on slates laid at minimum headlap.

*Rafter length restrictions apply at minimum roof pitch. For projects where the rafters are below the minimum recommended roof pitch, please contact Sandtoft Technical Support on 0870 145 2021.

After installation, natural weathering of the recycled slate will result in a change to the exposed surface, replicating the appearance of natural slate. Contact Sandtoft Technical Support for further information or to request a mini-sample which shows the comparative change to the surface appearance due to weathering, the rate of which depends on the local environment, climate and aspect of the roof.

Slight colour variations may exist between batches. Slates should be randomised on site to achieve a consistent appearance when installed.

Concealed ventilators must not be used on roof pitches below 22.5°

Moderate Exposure

Rafter pitch	20°	22.5°	25°	30°	35°	40°	45°	69°
Headlap (minimum) Duchess Countess	130 -	115 115	90 90	75 75	75 75	65 65	65 65	- 65
Coverage (m²) Duchess Countess	13.7 -	13.2 19.8	12.6 18.7	12.2 18.0	12.2 18.0	12.0 17.6	12.0 17.6	- 17.6
Batten Gauge (mm) Duchess Countess	240 -	247 197	260 210	267 217	267 217	272 222	272 222	- 222
Battens per m² Duchess Countess	4.16 -	4.05 5.08	3.84 4.76	3.74 4.61	3.68 4.65	3.68 4.5	- 4.5	- 4.5
Weight as laid (kg per m²) Duchess Countess	27.4 -	26.4 25.7	25.2 24.3	24.4 23.4	24.4 23.4	24.0 22.9	24.0 22.9	- 22.9

Severe Exposure

Rafter pitch	20°	22.5°	25°	30°	35°	40°	45°	69°
Headlap (minimum) Duchess Countess	- -	130 -	120 115	110 100	90 90	80 75	75 75	- 75
Coverage (m²) Duchess Countess	- -	13.7 -	13.4 19.8	13.1 19.1	12.6 18.7	12.4 18.0	12.2 18.0	- 18.0
Batten Gauge (mm) Duchess Countess	- -	240 -	245 197	250 205	260 210	265 217	267 217	- 217
Battens per m² Duchess Countess	- -	4.16 -	4.08 5.08	4.00 4.88	3.84 4.76	3.77 4.61	3.74 4.61	- 4.61
Weight as laid (kg per m²) Duchess Countess	- -	27.4 -	26.8 25.7	26.2 24.8	25.2 24.3	24.8 23.4	24.4 23.4	- 23.4

Tile Fixing

Sandtoft roof slates must be laid and fixed to comply with BS 5534: the British Standard Code of practice for slating and tiling, and BS 8000: Part 6: the British Standard Code of practice for workmanship on building sites.

To ensure compliance with these Standards we strongly recommend that either the recommendations given in the Sandtoft Zonal Method User’s Guide and Zonal tables must be followed where available or a calculated fixing specification must be obtained using Sandtoft’s Fixing SPEC service.

For further information go to Fixing SPEC or contact Sandtoft Technical Support on 0870 145 2021

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