b'CSA 123.26:21BRONZE VS. SILVER VS. GOLD ficationoffasteners,adhesiveribbonsRainwater ControlWind Uplift oradditionalsupplementalattachmentTherainwatercontrolrequirements Under the wind uplift category, dependingmethods, but in others you may need tofor silver and gold, when compared to on the ultimate uplift required in order tochange out the entire system in order tothewindupliftrequirements,require comply with the target resiliency rating,move from bronze to gold. This changeadramaticincreaseindrainquantity the roof assembly may have to changemay be in the method of attachment ordependingontheroofconfiguration. to comply. In general, the increases fromrequire a change in the system. AssumingIn the case of a warehouse, this can be the basic requirements are 30-50 per cent,the existing roof deck can accommodate,significant because of the requirement which will increase fastener density in alevels above bronze are achievable (at afor maximum distance between drains. MARS and adhesive density in an AARS,cost premium) on existing buildings, andThe standard requires maximum runs of or potentially both in a PARS. In somein new construction would represent an35 feet (silver) or 20 feet (gold) in terms cases, the change would only be a densi- increase in costs. ofdistancetodrain.Aswritten,this would actually require spacing on drains belowthosetwonumbers.Assuming equal spacing between drains, the hori-zontal distance measured diagonally, which is the maximum distance between TAILORED SOLUTIONSdrains, would be:TO FIT YOURSilver: 49.5 feetTAPERED INSULATION NEEDSWe design the most efficient and optimal layouts to ensureproper water drainage. E-designEstimationSite InspectionLabor Saving DesignsProudly serving roofing contractors coast to coast across Canada for over 40 years.Contact us for your next project posislope.com Gold: 28.2 feetThis does not take into account slope, which has a minimal effect on distance at two-per-cent slope.I have included an overhead picture Phone: 250.336.8088 of a warehouse. The main roof area is Toll Free: 1.888.318.8642 about79,000squarefeet.Itwasbuilt www.nelsonroofing.com approximately 10 years ago and incor-contact@nelsonroofing.comComox Valley, Campbell River, Powell River porates approximately 11 drains into the main roof area.24 lROOFINGBClSPRING 2025'