b'reenRoofingUpdate Roofing and Photovoltaics By Kurt Baumgartner and Ja Crisp y Astheentireworldismovingto spend the returnoninvestmen anelectricianorPVtech ian t.nictoward the "green" side of the con Grief, to ent and deprecia on mayneed topr ent to en e that rm ti bees surstruction market, roof are beingbe the only returninstore for thetheroofer d s notcr te any topsoe eacalled upon as afor everythingconsu rthatigno scommontr le? Weknowfrom baseme re oub already windesexpfrom gardens toturbin to asense and simple foresight. Whenlongerience that after the PV support system for arrays of solar the roof is vie simply asmostte n ian has b there, afwedthech ic eenrooele icting panels.conven t andt-of-the way pla ingch ic w ltoby. ctr genera ien ou ceme an il needstop With government subsidies of upto install these systems,re and The c n inroo ng syseve ha gefi stem to 30% and the possibility of sellingexpensive pr lems may soon pres warranty statusasa resuof ob It excess production back toeent themselves.addingthe equipmentsupporth powerts gartne grid;intrepid building ownersIssues that need toadd dandadditio ntenance of Kurt Baum r someberesse thenal maiare either installing theirnbypetent lo contractors c thesystem.Ch to soow powercom calon angesme systemsorare leasing theirroofversantthhistorysituationsystemin alla nsmay in r wi theandst tio cuspace to companies involved in of the buigthe roof in :m warr tyexpe whmar Iandclude ajoran nseile dinketingand operatingsolar-electric T and con onthe roofother warrantiesm simply be he agediti ofay s.oided photovoltaic system thatthesesystemsaretobev without notice. T marketing ofconcept h installed upon: Itno T dam toroofing sy em hethisasmakessenseheagethestbecome so widespread, and the pro to insta arty-year life PV sys as alt of addition construcllthi resuliferationof th systemsamongtem on a roof with five ortion and maintenan traffic; the eseten yearsce man turers so extensive, that theofserviceablelifer .in n and roof m not be ufac emaining sulatio ay con ptisbeginn toappearWhen it c time to re-roof,design to bearn lightaffic ce ingomestheedeve trJay Crispm and commo . It isentire PV system may havebewith out damage. Some damaainstreamnplace toge monlyassumed also com beingthatremoved to facilitate the reroofingmaynotbecomeimmediately Grief, torment andthe rap exp in use and thep and thenr talled.o iousea v ortarder or idansionrocess,beeins bv du toap reresultingincreasein volumewillThe Iexpectancy and the pre thick insula layering or brittle ifetion depreciation may beresu indecreasesofequipmentd b changeinrep e compressib insula on. lticta lelacem ntletithe onlyinprices.costs must be includedin anySomeinstallationsmaycreate return T o n promised by theanalysis.newmaintenance req r ts hepportu ityui emenstore for the consumerph (PV) ind try ising The change (increase) in the costand safetyider In lotovoltaicus look cons ations.staincreasinglyattrac veandevenof main ining the roof as a r ltlationsm changewin r load that ignores commonti ta esu aytec ing to ownerscontrac of numerous n r ionse e tio for thef de or ompell andew penet at toxp cta nsroo ck sense and simpletors. No one wantsbe left behind.accommodatethePV system:thesu ingroo .They torround fsH like ma goodideas,Whena roofingser ceman isshou certainlyrequire houseowever,nyvi ld foresight.there isreconsider th whereworkingu these panels willk ingandcleaningthattypimo toanndereepcallyunk nmost roofing isnow to s. customer Shadedsystems mightrt algae or moss suppo and r e cleaninga some of equir nd thosemay requirec l comspe iapounds. Some consequences arerre y cu ntlwnre unkno or a still being studied:Some designershaveindic ed thatincr dload at theease heat radiatedfrompanels will agea roof fasterthan norma Some l. suggest that the shade provided by thels will actuallyl the pane cooroof. ontinued C on page 10 3'