b"opment of newer, structur flexible, PV thin-film and polymer-surfacedrolls. The PV laminated single-ply roof system is installed over an existing ally crystalline-silicon modules, have we seen the integration of PV with tradi compatible roof system or as aroofing system using traditional roof new tional roofing materials. Today, there are anew roofing systemsconstruction methods and techniques. number of and products on the market using laminated PV, flexible-film, and polymer Onnew projects,a new(non single-ply roofingsystemis firsolar)st surfaced crystalline.include shingles, roof tiles, metal roofs, modifiedinstalled.can be mechanically fastened or fully adhered. N the factoryTheseItext, ctionrane bitumen, and single-ply roof membranes. These are dual-fun productslaminated,single-plymemb andflexible PVmodule areinstalled that weatherproof the building while generating renewable energy from thedirectly over the single-ply system and hot-air welded in place. sun.Open E ORISystems, and SolarPower Restoration Systems have nergy, created atypenonglass silicon solarBIPVlaminating newofmodule forby Metal Roofscomposite panels with crystalline silicon cellswith alar, transcoveredsoUni-Solar pioneered the application of flexib .PV modules toparent-polymer top surface and attaching the modules to EPDM, PVC, and le thin-film Itspressure mem ranestheOne architectural metal roof panels.flexible, thin-film module has aTPOb in the factory or infield.advantage of the crystalline sensitive, peel-and-stick adhesive on its back surface and can be factorysilicon systems ishigh power density per square foot. More power outthe laminated to metal roof panelsrconstruction. T lf-adhesive, flex put per square foot isthan with the thin-film systems-an imporfo newhe se produced ible,-film PV modules can be applied to existing sn and battentant consideration on smaller roofs. thin ap-lock standing seam metalroofs if the metal panels have aprofile betweenBoth crystalline silicon and thin-film solar modules get hot on summer flat seams.Continued on page 10 hasstep Another company, Dawn Solar,gone afurther by combining flexible solar modules with metal roofing and ac r heating syscon ealedadiant tem undermetal panels, creating both electricity and hot water from the the sun. Standard R-panel metalroofs with complex panel profiles, overlapp g inseams, exposed fasteners, and stiffener beads or striations have been limited to traditional equipment-mounted, glass, solar modules. Asolar new trsystem combines certain elastomeric coatings and inter-ply materials ~oof ~ ith flexible, thin-film PV by SolarPower Restora Systems. T bridges tionhis the R compound roof profile and exp fasteners, creating aat -panel'sosedflsubstrate for the PV modules. The SolarSeal PV System uses thin-film modules andto both waterproof the metal roof and generate renewable coatings energy. by SolarPower Another solar metal roof attachment systemuses highenergy flexible magnets for attaching thin-film PV to metal roof panels, creating asolar roof system. Thenitrile-rubber-composite redeployablethin, magnetsthin-film module systems perform wellin high-wind condiand tions and have the advantage of being transferable to another solar roof host Figure 3 -Uni-Solar metalwith-film photovoltaics. site.panelsthinPV Flexible thin-film modules are one of the best options to affix aarray bu thto metal roofs. Rigid glass silicon PV modules worktey require some form of mechanical attachment. It is important to determine how the additional weight of heavier glass modules and rack attachment systems affects the building structure and metal roof system. (See Figure 3.) Single-Ply Systems One of the most common low-slope solar roof systems todaya usesfactory-laminated,flexible, thin-filmPVmodule toa single-ply membrane sheet. T was p by Solar Integrated T ies over 20 his conceptatentedechnologtoget er,Sika Integ ated years ago. Workingh Uni-Solar,-Sarnafil, and SolarrTechnologies (SIT) created the first single-ply BIPV PV roof system. PVC single ply is the membrane polymer of choice, while T can a be used. POlso Both flexible PV modules and single-plyare membranesmanufactured in ~ imilar fashionintolongsheets. The factory-laminated, single-ply membrane and PVare shipped to the project site inpremanufactured panelslarge,Figure 4 -Solar Integrated Technologies'-film laminated roofs. thin9"