Skip Navigation
Find a Stockist

Technical - 20/20


20/20 Interlocking Plain Tile


Technical Data

Minimum roof pitch
15° at 100mm headlap
22.5° at 75mm headlap
Headlap (minimum)
75 mm
Headlap (maximum)
120 mm
Batten spacing at maximum gauge**
255 mm
Batten spacing at minimum gauge
210 mm
Size of tile
330 x 226 mm
Covering capacity at maximum gauge
22.7 tiles per m² at 100mm headlap
20.5 tiles per m² at 75mm headlap
Cover width
191 mm
Profile depth
16 mm
Hanging length
300 mm
Weight as laid
49.9kg per m² at 100mm headlap
45.1kg per m² at 75mm headlap
Weight per 1000
2.2 tonnes
Weight per tile
2.2 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 m²
4.3m at 100mm headlap
3.9 m at 75mm 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
45 x 3.35 mm aluminium ring shank clout head
Nail size/type for metal tile clips
55 x 3.35 mm aluminium ring shank clout head
Nail size/type for plastic tile clips
55 x 3.35 mm aluminium ring shank clout head
* * *
For projects where the rafters are below the minumum recommended roof pitch, please contact our Technical Services for advice
Rafter length restrictions apply at minimum roof pitch.
Concealed 20/20 ventilators must not be used on roof pitches below 22.5°.
Note that the miniumum recommended roof pitch for concealed tile vents is 22.5°.  However, we will shortly be introducing a low profile cowl ventilator into our range suitable for use at 15°.
** Clay tiles are subject to small variations in size because of drying and firing shrinkage in the manufacturing process. Before deciding on the batten gauge and linear coverage, the roof tiler should inspect each batch of tiles to ensure that the correct minimum headlap and sidelap are achieved. For further guidance please contact Sandtoft Technical Services on 0844 9395 999.
Note: unless otherwise stated, data is based on tiles laid at minimum headlap.

Tile Fixing

Sandtoft roof tiles 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 Services on 0844 9395 999.