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Technical Information
| Installation Details Sorting slates We recommend that the slates are sorted into at least three grades of thickness. It is extremely important that slates are sorted prior to fixing to ensure that slates in any one course are of the same thickness to prevent "kicking" slates or unsightly gaps. Fixing slates Any slating work should be in accordance with the latest editions of BS5534 Part 1: 1997 and BS 8000: part 6 or with any subsequent parts/editions or standards We advise that slate and halves be used where cutting of normal slates would result in slates with widths being narrower less than 150mm (6") reducing the side lap and therefore the integrity of the roof. Nails should comply with BS 1202: Part 2 Copper clout minimum shank diameter 3.35mm. The type of shank on the nail will depend on site exposure. Batten size 50 x 25mm for double lap slates with minimum 450 mm span recommended. Battens fully supported by boarding, sheathing and sarking can be reduced to a minimum size 38 mm x 19mm | Map showing the country divided into two zones on basis of wind speeds  
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| Scottish
Practice | ||
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Traditional Method As above Fixing It is generally recognised that single head nailing is acceptable with small slates, but every third course should be double nailed.
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Boarded
Roofs | ||
| Minimum
Recommended Headlap |
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| Slate
Size |
Moderate
Exposure |
Severe
Exposure |
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Roof
Pitch |
Roof
Pitch |
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| mm |
inches |
20 |
22.5 |
25 |
27.5 |
30 |
35 |
40 |
45 |
22.5 |
25 |
27.5 |
30 |
35 |
40 |
45 |
| 600
x 300 |
24
x 12 |
125 |
105 |
90 |
85 |
75 |
75 |
65 |
65 |
135 |
120 |
115 |
105 |
90 |
80 |
70 |
| 500
x 300 |
20
x 12 |
115 |
100 |
90 |
85 |
75 |
75 |
65 |
65 |
120 |
100 |
90 |
80 |
75 |
75 |
65 |
| 500
x 250 |
20
x 10 |
125 |
105 |
90 |
85 |
75 |
75 |
65 |
65 |
130 |
115 |
105 |
100 |
90 |
75 |
65 |
| 450
x 250 |
18
x 10 |
- |
- |
- |
90 |
75 |
75 |
65 |
65 |
- |
- |
- |
115 |
110 |
90 |
65 |
| 400
x 250 |
16
x 10 |
- |
- |
- |
85 |
75 |
75 |
65 |
65 |
- |
- |
- |
95 |
90 |
75 |
65 |
| 400
x 200 |
16
x 8 |
- |
- |
- |
90 |
75 |
75 |
65 |
65 |
- |
- |
- |
105 |
105 |
90 |
65 |
| Weight/Coverage |
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| Slate
Size |
Weight
|
Slates
per m2 |
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Lap
(mm) |
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| mm |
inches |
per
1000 |
50 |
65 |
75 |
80 |
85 |
90 |
95 |
100 |
105 |
110 |
115 |
120 |
130 |
| 600
x 300 |
24
x 12 |
3000kg |
12.1 |
12.5 |
12.7 |
12.8 |
12.9 |
13.1 |
12.2 |
13.3 |
13.5 |
13.6 |
13.7 |
13.9 |
14.2 |
| 500
x 300 |
20
x 10 |
2400kg |
14.8 |
15.3 |
15.7 |
15.8 |
16.0 |
16.2 |
16.4 |
16.6 |
16.8 |
17.0 |
17.2 |
17.4 |
18.0 |
| 500
x 250 |
20
x 10 |
2000kg |
17.8 |
18.4 |
18.8 |
19.0 |
19.3 |
19.5 |
19.8 |
20.0 |
20.3 |
20.5 |
20.8 |
21.1 |
21.6 |
| 450
x 250 |
18
x 10 |
1800kg |
20.0 |
20.8 |
21.3 |
21.6 |
21.9 |
22.2 |
22.5 |
22.9 |
23.2 |
23.5 |
23.9 |
24.2 |
25.0 |
| 400
x 250 |
16
x 10 |
1400kg |
22.9 |
23.9 |
24.6 |
25.0 |
25.4 |
25.8 |
26.2 |
26.7 |
27.1 |
27.6 |
28.1 |
28.6 |
- |
| 400
x 200 |
16
x 8 |
1200kg |
28.5 |
29.6 |
30.7 |
31.2 |
31.7 |
32.1 |
32.6 |
33.2 |
33.7 |
34.2 |
34.8 |
35.4 |
- |
| Natural slates are individually split and individually dressed and should be treated as an individual unit when being fixed on the roof. One slate may suit a particular location on the roof better than another, perhaps for reasons of thickness, natural curvature, surface texture of appearance, therefore proper grading and selection of slates is extremely important to achieve a neat and attractive finish. |
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All Slate will weather to a degree and after time will show a surface difference in colour tones. When the change is slight the colour is classified as "permanent" or "unfading". If the final results are more evident, the colours are classified as "weathering". Please note all green slates may be subject to slight oxidation on the surface. This does not affect the slates integrity or performance as a roofing material or the life expectancy of the slate. |