b'We also suggest that potential conden to meet ASTM wind standards but UL windSection M3: Roofing Waste sationproblems withcoolor white roofstests,ich require astandard.Management wh different shouldbedealt withbyinstallingvaporWhataboutincreasedthickne ofNo comment. ss barriers when appropriate.single-ply membrane roof systemswhen Southern climate concerns related to coolinst BIPV? NRCA recommendationSection M4:Low-voe Materials allingis roof calculators indicate the need for less in 72 mil minimum thickness, with an a itiveTheuseofLow-VOCmaterialsisfine, ddbutit shouldnot redu the strengthof sulation based on reflectivity. Ifwhite roofpackage to handle higher heat loads.ce the is not adequately cleane coupled with poorWhat aboutBIPV onmechanically at adhesionanddurabilityofthemated, rial. Lo materials sho be able to insulation,it is an energy efficient sub tachedroof systems? NRCA recommendsw-VOCuld then system. We suggest that additional credit benot installingBIPV onmechanically fas show similar or greater quality. combination ofSection W1: Roof Storm Water assigned to aenergy efficienttened roof systems. alternatives, high R-value and reflectivity.The definition of an"energy-ready roofRetention system"be defined more s n ntly. shouldtri ge Thesus n andecono return Section E4: Roof Air Barrier/ MoistureFor example, m tai abilitymic Retarderanufacturer\'s representativeson investment should be reasonable and have advised over the past years that all roofsh environmental beneGuidelinesshouldaddressusing,ornotsystems are solar ready.Adequate researchowfit. using, vapor barriers when appropriate andand or specifically formulatedmaterialtoSection W2: Roof Related Water Use isdoesdeal with point loading,ion,heatReduction ensuring itinstalled properly. Also. it not make sense to mechanically fasten insu adhes and loads should be ato qualify asThesus bilityandeco return lation over abarrier by penetrating therequirementtaina nomic vaporsolar ready material.on investment should be reasonable and vapor barrier with fasteners.show environmental benefits. Section E5: Roof Top Energy SystemSection E6: Roof Day Lighting ThiscreditshouldbemeasuredbytheDaylightisa greatsustainableresourceSection D1: Durable Roof Insulation and should be used when appropriate. ToSystem production of energy in relation to the de determine if it is appropriate. the applica High-density cover b in combination mand or usage of energy requiredin theoard, building, in lieu of following the minimumtion should be designed to reduce energywithroofmembrane. shouldmeetthe percentage of available roof space.loads as well as be economically feasible.impact resistance (hail) standard. It may not make sense ifskylight is covthe Fire Code lssue-"Class ASys Section D2: Roof Drainage Design Roofingered with snow for part of the year.Also, tems" vs."Class CSystems."Certified drainage plans may add cost and Photovoltaictheroofingindustry mayhavea difficult Aportion of commercially available PVnovalue.Newconstructioncaneasily largetimeunderstandingfootcandlesasthe products are Class CWhat does thisaccommodate a -in. slope. To enter the rated.measuring unit. rooft,sitdo to the Class Arating? Additionally,roofreplacementmarke po iveslope an energy system should receive additionalSection M1: Recycled Contentshouldbeadoptedin roof replacement creditor requiredminimumstandardforMinimummaterialstandardsshouldbescen ios.idea is forroof to drain. ar Thethe meetingtheCALFire-OSFM accessibilitychallenged, reviewed,increased, if nec not for it to drain fast. To ensure a drainand recommendations. There is some probabilityessary, to avoid sacrificing the performanceage plan will function properly, the design of this showing up in the new NEC codes.of materials toa p re failuremo and field application must work together. rematu de Although excessive penetrations poten resulting from using recycled content. tially lead to poor durability and prematureSection D3: Roof Traffic Design Section M2: Material ReuseThe intent is to promo theof walkfailure,Ballasted PV systems may lead toteuse MRCA favors salvaging and reusingo ways,t tothe guidelinepromote wind uplift and point loading issues.Pro go d,no useto dry, stable insulation materials. Wene aclkway system. The elevated fessionalroofersare, familiar withproperedspecifi watobeverycarefulinstalling morethanwalkway system may cause pointloflashingtechniquestoreduceleaksas adoneroof ona building.Whendoingso.ing on the roof. Manufactu approved sociated with penetrations.Therefore,PVred we transfer the cost,andtheeconomicwalkway s te are a u We ssystems shouldreceive additional creditsys msdeq ate.ugand environmental impact. to re andgest that the documentdirectly address for proper roof tlashingsover promotionmove recycleroofingmaterialto the fu aswalkwaypadlayoutandthedesired of ballastedsystems, promotedby solarture. wellas reduce the life expectancy of theresuin that work independently of thelts. tegratorsnew materials.continued on page 10 roo industry. PV systems do not have fing Midwest ValuesBusinessResourcesNetworking9'