Sandtoft Dual Calderdale Slate

Dual Calderdale is an interlocking flat concrete tile with an engineered central groove designed to give the appearance of smaller format slates.

Dual Calderdale should be laid quarter bond. The correct pattern is obtained by starting / finishing at verges using half and three-quarter width tiles, cut-on-site. For more information please refer to the installation guide or call Customer Support on 0844 9395 900.

  • BRE Green Guide rating A+
  • Complies with the requirements of BS EN 490 & 491
  • Manufactured under quality management system BS EN ISO 9001
  • Meet the performance requirements of BS 5534
  • Can be fully integrated with the Sandtoft Solar Roof
  • Manufactured using 100% green electricity

Available Colours – Dual Calderdale Slate


Dark Grey
Dark Grey


Terracotta Red
Terracotta Red


Dark Heather
Dark Heather

Technical Info:- Dual Calderdale Slate

Minimum roof pitch*

17.5° at 100 mm headlap

22.5° at 75 mm headlap

Headlap (minimum)

75 mm

Headlap (maximum)

120 mm

Batten spacing at maximum gauge

345 mm

Batten spacing at minimum gauge

300 mm

Size of tile

420 x 334 mm

Covering capacity at maximum gauge

10.6 tiles per m&sup2 at 100 mm headlap

9.9 tiles per m&sup2 at 75 mm headlap

Cover width

294 mm

Profile depth

28 mm

Hanging length

399 mm

Weight as laid

56.2 kg per m&sup2 at 100 mm headlap

52.5 kg per m&sup2 at 75 mm headlap

Weight per 1000

5.3 tonnes

Weight per tile

5.3 kg

Weight per pallet (including pallet/packaging)

1.1 tonnes

Quantity per pallet


Quantity per row/band


Quantity per mini pack


Quantity per layer


Mini packs per row


Battens per m&sup2

3.1 m at 100 mm headlap

2.9 m at 75 mm headlap

Batten size – up to 450 mm rafter centres

38 x 25 mm

Batten size – up to 600 mm rafter centres

50 x 25 mm

Nail size/type for tiles

50 x 3.35 mm aluminium ring shank clout head

Nail size/type for tile clips

50 x 3.35 mm aluminium ring shank clout head

Fittings:- Dual Calderdale Slate

Angle & Legged Angle Ridges

Angle & Legged Angle

Monopitch Ridge

Fibreglass Valley

Tile Clip

Contact John for more information or give us a call on 0161 724 4004