Roofing Slate Specifications - Slate Standards & Roof Slate Weights
Bellstone supplies only those slates that meet either the ASTM (American), NF (French Norme) or BS EN (British Standards / European Norme) standards. We only distribute slates that have an estimated working life of 75 years or more.
Roofing slate specifications are published in the table below. The data is supplied by the manufacturers and is based on their most recent tests which are usually carried out each year to ensure that the slate meets the required standards.
| Quarry | Penrhyn | Penrhyn | Penrhyn | Glendyne | Campo |
| Country of Origin | Wales | Wales | Wales | Canada | Spain |
| Slate Type | Capital | Capital | Capital | 5's | Cabana |
| Size (mm) | 500x250 | 500x300 | 400x300 | 508x254 | 500x250 |
| Pre-holing (distance from top)
|
200mm
|
200mm
|
unholed
|
190mm
|
215mm
|
| Thickness | 5.5mm | 5.5mm | 5.5mm | 5mm | 4.5 mm |
| Slates / m2 (80mm headlap)
|
18.7 | 15.6 | 20.8
|
18.5
|
18.7 |
| Colour | Heather Blue | Heather Blue | Heather Blue | Blue / black | Charcoal grey |
| BS EN 12326-1 2004 (A1, S1 & T1)
|
Yes
|
Yes
|
Yes
|
-
|
Yes
|
| NF P32.301 & 302
|
-
|
-
|
-
|
-
|
Yes
|
| ASTM C406-06 | - | - | - | S1 | - |
| Durability | 100 years | 100 years | 100 years | 75+ years | 75+ years |
| Guarantee | 100 years | 100 years | 100 years | - | 75 years
|
Please note that slate is not recommended for roof pitches less than 20 degrees.
Go to Roofing Slate User Guide for handy hints on specifying slate.