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Box Gutters
Box gutters must:
- Be designed by a hydraulic engineer and verified by the MPX hydraulic engineer.
- Filled and tested for 24 hours.
- Be supported at:
- Each stop-end
- Either side of sumps
- Either side of expansion joints
- At rain heads
- At generally not greater than 750 mm centres elsewhere
- Be straight with no reduction in width or changes in direction.
- Have a constant slope between 1:40 & 1:200 with no ponding except for water retained due to surface tension. Ponding result from any one of or a combination of the following, is a defect.
- Have lapped joints made against the direction of flow.
- Have expansion joints to be a proprietary EPDM rubber expansion joint.
- Have expansion joints at the high point of the gutter.
- Overhang of the roof sheeting must extend a minimum of 50 mm into the box gutter but never more than 200 mm.
- Maintain a minimum of 300 mm between sheet ends to permit cleaning of the gutter.
- Box gutter sumps must be fitted with overflow ducts, overflow channels or high capacity overflow devices
- Box Gutter Sumps
- Ensure that adequate overflow provisions are made, and any surcharge is accommodated
- Have an overflow weir not less than 25 mm below the sole of the gutter discharging to the rain head.
- Box gutters must be installed with sumps or rainheads
- Overflows must discharge outside of the building in a visible location. This provides a visual warning that when running, indicates the stack our sump is choked.
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