High front guttering advisory committee report - NSW Fair Trading ...

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dealing with a portion of the 100 year ARI that would normally need to be dealt with via overflow provisions To collectively model the above issues, a diagram is shown in Figure 2. It aims to simply structure understanding concerning the areas of overflow management relevant to high fronted guttering. By viewing these components in measurable overflow terms, it should be possible to more easily and reliably prove compliance of high fronted guttering in meeting BCA performance requirements. 25
Gutter capacity based on ARI HIGH FRONT GUTTERING are commonly designed to meet the 20 year ARI as specified in the BCA’s Deemed to Satisfy options. + Additional gutter capacity can be added through conservative gutter sizing and/or increased capacity Gutters can be designed to achieve greater capacity than the 20 year ARI (up to and including the 100 year ARI). Where matched with appropriate downpipes, this can potentially reduce the amount of overflow management required for high front guttering Add formally designed overflow measures Most overflow mechanisms are currently specified in categorical terms but should in future be published in measurable performance terms where one or more are selected to meet the 100 year ARI, including options such as slotted gutters, nozzles, dropped stop end, rainwater head, rear gap gutter spacers and rear flashings i.e. designers will choose the best option(s) for the situation + + Figure 1: Combined overflow management in meeting the BCA’s 100 year ARI performance requirement 26 Add previously unrealised overflow measures and work towards formalising the level of performance from these measures. Mechanisms include: • overflow at the low end of the gutter as facilitated by a 1:500 gutter fall below the top of the fascia; • a rear gap between gutter and fascia facilitated by the deflection that occurs in guttering under full water load. = Aggregation of measures must Provide sufficient overflow management in HIGH FRONT GUTTERING systems to be able to meet the 100 year ARI performance requirement of preventing water entry into houses (BCA P2.2.1)
Page 1 and 2: High Front Guttering Advisory Commi
Page 3 and 4: Mr Warwick Neilley Warwick has exte
Page 5 and 6: Executive Summary High fronted gutt
Page 7 and 8: overflow rates for their preferred
Page 9 and 10: 1 Background The following includes
Page 11 and 12: were received including six from ma
Page 13 and 14: from the tidal “head” to preven
Page 15 and 16: The performance requirement that wa
Page 17 and 18: them has confused rather than clari
Page 19 and 20: Inspectors advised that all homes e
Page 21 and 22: the public about risk mitigation st
Page 23 and 24: downpipes and downpipe location req
Page 25: location of the downpipe along the
Page 29 and 30: strengthening the roles and respons
Page 31 and 32: 15 Training, Licensing and Associat
Page 33 and 34: there is insufficient knowledge in
Page 35 and 36: Slots Conclusion: Slots for overflo
Page 37 and 38: AS3500 that have a bearing on the i
Page 39 and 40: 1.7 The consultation outlined above
Page 41 and 42: Government and Regulatory bodies:
Page 43 and 44: The fact that both the BCA and the
Page 45 and 46: greywater diversion to be carried o
Page 47 and 48: Appendix D - Chronology of changes
Page 49 and 50: BCA Date of adoption in NSW BCA 96
Page 51 and 52: BCA Date of adoption in NSW BCA 200
Page 53: Published by NSW Fair Trading © St

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