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Technical DataTechnical Data |
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| Technical |
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| For greater technical detail – refer to HARCON Technical Data Sheets |
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| Valley Weights |
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| Standard valley troughs (HD, HA, HB) |
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1.64kg/m² |
| Heavy weight valley troughs (DX, AX, BX) |
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2.10kg/m ² |
| Valley Thickness |
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| Standard valley troughs (HD, HA, HB) |
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1.3mm |
| Heavy weight valley troughs (DX, AX, BX) |
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1.6mm |
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| Valley Selection Table |
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| The open width of a valley in any slate or tile roof is specified in BS5534: part 1: 1997 depending on rafter pitch and roof area to be drained. To ensure compliance with this, use the following table to select the appropriate HARCON valley trough type: |
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| Rafter Pitch (degrees) |
Valley Type |
Max. Valley Length |
Valley Type |
Max. Valley Length |
Minimum Lap Length |
| 17.5 to 22 |
B / D |
7.0m |
- |
- |
350mm |
| 22.5 to 29 |
A / B / D |
7.0m |
B / D |
14.5m |
300mm |
| 30 to 34 |
A / B / D |
7.5m |
B / D |
15.0m |
200mm |
| 35 to 39 |
A / B / D |
7.5m |
B / D |
15.5m |
200mm |
| 40 to 44 |
A / B / D |
8.0m |
B / D |
16.5m |
150mm |
| 45 to 49 |
A / B / D |
8.5m |
B / D |
17.0m |
150mm |
| 50 to 55 |
B / D |
9.0m |
B / D |
18.5m |
150mm |
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