Minimum Freeboard Values
In gutters where overflow can enter the structure, it is necessary to have freeboard to allow for wave action, obstructions, and other unforeseen circumstances. Capacity Calculations allow the these minimum freeboard values.
Minimum Freeboard Values
| Gutter Type | Freeboard |
|---|---|
| Internal gutters | 20 mm |
| Secret gutters | |
| Valleys with a pitch less than 8° | |
| Asymmetrical valleys | |
| External gutters with no overflow | 15 mm |
| Valleys with a pitch of 8° or more | |
| External Gutters with Overflow | No freeboard required |
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Revision Category:
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