b'CSA 123.26:21TherequirementsofgoldmakeCostingachievingthisstandarddifficultonAs part of the processes in developing existingbuildingsastheexistingastandard,NRCobtainedanimpact plumbingwouldrequireacompleteanalysis for Western Canada. The find-overhaul.Inaddition,therequirementings indicate that, on new construction, for the slope to be in the structure meansmovingfrombronzetosilverwould thatthegoldstandardwouldinmostresultinanincreaseinroofingcosts cases require substantial deck changes.ofapproximately10-20percent,and Thediameteroftheindividualdrainsmoving from bronze to gold would be wouldbesmaller,butwithapproxi- 20-40-per-centhigherroofingcosts. mately 10 times the number of drains, itHowever, when compared to the cost of would be extremely costly to retrofit tothe entire building, the projected costs meet this requirement.rangedfrom0.5percentofbuilding Copyright Google Earth.The red dots indicate the approximate existing drain locations.Copyright Google Earth.Thebluedotsrepresentpossible drain locations to comply with the silver requirements. There are 24 drains in this configuration. This could be achievable in a retrofit scenario with some modifica-tions to the plumbing.TRS BUILDING ENVELOPE CORP.TOMTAR ROOFING& SHEET METAL LTD.Copyright Google Earth.TheyellowdotsrepresentpossibleUnmatched Industry Experience.drainlocationstocomplywithgold requirements.Thereare96drainsin Serving the Interior & Western Canadathis configuration.www.rcabc.orgl25'