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BALMORAL NATURAL SLATE: Technical Information

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MODERATE EXPOSURE

Driving Rain Index less than 7 m/s
Minimum recommended Laps for various Roof Pitches

Slate Dimensions
ROOF PITCH
inches
mm
20°
22.5°
25°
30°
35°
40°
45°
85°
24 x 14
610 x 355
115
100
75
75
75
65
65
•
24 x 12
610 x 305
•
115
85
75
75
75
65
•
22 x 12
560 x 305
115
100
75
75
75
65
65
•
22 x 11
560 x 280
•
115
85
75
75
75
65
•
20 x 12
510 x 305
115
100
75
75
75
65
65
•
20 x 10
510 x 255
•
115
85
75
75
75
65
50
20 x 9
510 x 230
•
•
•
100
100
75
75
75
18 x 12
460 x 305
115
100
75
75
75
65
65
50
18 x 10
460 x 255
•
100
85
75
75
75
65
50
18 x 9
460 x 230
•
•
100
75
75
75
65
50

 

SEVERE EXPOSURE

Driving Rain Index more than 7 m/s
Minimum recommended Laps for various Roof Pitches

Slate Dimensions
ROOF PITCH
inches
mm
22.5°
25°
30°
35°
40°
45°
85°
24 x 14
610 x 355
125
100
85
75
75
75
•
24 x 12
610 x 305
•
•
115
100
75
75
•
22 x 12
560 x 305
125
100
85
75
75
75
•
22 x 11
560 x 280
•
115
100
85
75
75
•
20 x 12
510 x 305
125
100
85
85
75
75
•
20 x 10
510 x 255
•
115
100
85
75
75
65
20 x 9
510 x 230
•
•
•
•
•
•
100
18 x 12
460 x 305
125
100
85
75
75
75
65
18 x 10
460 x 255
125
115
85
85
85
75
65
18 x 9
460 x 230
•
•
•
100
85
75
65


NOTES:

When laying slates on the roof, they do not actually lie at the same pitch as the rafters. This should be taken into consideration when using Extra-Heavy slates on a roof with an angle of pitch less than 25°.

Although these tables give a general indication of the pitch and Lap Sizes for slate roofs. there are other factors that can also be considered when designing the roof. For further information contact us by email or telephone on (02) 9666 1592.

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