b'CSA 123.26:21cost to just over 2.5 per cent of buildingcan react to todays codes and also allowto meet their clients budgetary needs. cost. Comparisons on existing buildingsforchangesinweatherpatternsgoingOn new construction, the silver standard were not supplied. forward.Thewindupliftcomponentfor drainage would represent a relatively can be incorporated relatively easily intolow increase in overall costs, but the gold CONCLUSION bothnewandexistingconstruction;may be prohibitive for the average devel-CSA123.26:21 providesastandardizedhowever,rainwatermanagementpres- oper who is building in an environment pathwayforwardtoincreaseresiliencyentssignificantcostsandhurdlesonwhere maximizing profits is a primary inroofingstructures.Thetwoprimaryexisting construction.driver. On reroofing, the requirements components,windupliftandrainwaterAs the standard is voluntary, I see a(structuralslope)forgoldrainwater management,haveprescriptiverequire- potential for the design community tomanagementmakereconfiguringthe mentswhichshould,incombinationsegment the standard and design for silverroof to comply extremely expensive in with Climate-RCI, provide a more resil- or gold wind uplift, but leave portions ofall but the most drastic of renovations ientassemblyforbuildingownersthatthe drainage standard out of the designwhere the structure is changed.Courtesy NRC.New BC Office - 3435 194 St, Surrey, BC V3Z 1A5Roofing - WaterproofingCladding - Glazing - Service604-282-7960BCestimating@bothwell-accurate.comwww.Bothwell-Accurate.comwww.rcabc.orgl27'