b"httegrating Photovoltaics Onto Building Env e Surfaces elopContinued from page 9 PV systems integratedstandard asphaltmodified-bitumen1 withandBIP\\i roofs have lagged behind inlopment. With summer su operating deve rface temperatures ap 180F,attaching PV modules directly onto an proaching lowerhas asphalt-based roof membrane with asoftening pointproven to be difficult. SB membr tend to have lower softening points coS-modifiedanesmparedto APPandstandard90-lb capsh . The difference in ther l eets maexpansion between the modules, adhesives,asphalt roof m direct andakes adhesive attachment challenging. Adhesive attachment to gr u suran lefaces Asles can be problematic.the surface temperature rises, granu may not stay themembattached tomembrane surface if the systems (module andrane) have a large range ofandion over the day/night ther l contractionexpans macycle. Figure 5 -Open Energy modules andmembrane system.Recently, two companies have been working on new application m . single-plyethodsPerformance Roofing Systems has come up with aw-applied solar ne fieldSolarSeal Technolog,esPatent PendingDetatl Copynght 2006roofing system that bonds the Uni-Solar flexible moduleto its Derdirectly biBrite APP-modified-bitumenmembrane. DerbiBriteoriginally was developed for restaurant and fast-food roofs. DerbiBrite high scrim placement and fa foil-resistant,-applied acrylic surfacing bon the t- factory ds with Uni-Solarle's-rubber-back surface adh . modu butyl esiveSolarPower RestorationSystems h developedaPV systemfor asnew a -based roofs. The patent-pending SolarSeal PV Ro System comsphalt of bines high-performance, elastomeric roof coatings suchpolyurethanes as flexib ormonowithle thin-filmcomposite panel modules, forming alithic, Figure 6 -SolarSea/ System overmembraneUni-Solar PV module. SBSwith days. Moduletemperatures canexceed180F in the Southwest. surface Photovoltaictend to be dark inlor and can absorb aof heat. modulesco lotF re 7 -SolarSeal Fan-Fold System. The roofing industry needs to pay attention to solar modules in direct con igutact with roofing membranes and mon how long-term surface exposureweatherprooftthe asphalt-based membr roof sysitormembrane tha protectsane branes.This is part effectiveenstato higher temperatures affects the service life of the roof mem Fromtem and generates electricity.icularlywh in lling a anint,single-ply membrane manufacturer ica solar array over anroof.Figure desig standpo refer tos' specif existingsystem (See6.) tions for hot-stack flashings.l major roof manufacturers recomm Called the SolarSeal Fan-Folda, n array Severa endSystem,newly developed onglass placing insulation between asurface and the membrane on thesystemcom engineeredcorrugatedcompositepanelsconnected hot-stackcebines surface temperatures reach 120F. Most white single-ply roofs are known astogether with flexible jo ts, using cr lline silicon for high powerin ysta erdencool roofs and h surface temperatures normally no more than 10 15Fsity with apolymer surface.Thejustable Fan-Fold system ave- transparentadcanbrane or above ambient air temperatures. Now, though, white roof membranes withunfolds out of the box andbe applied flat directly to the mem as solar lamina are exposed to surface temperatures 30Fan offsetarray system.PV modu op temtes-70 higher.self-contai edslopedTheleerating If a high percentage of amembrane roof iswith solar mod pera is reduced by airflow through the panel's corrugation. Thelar whitecoveredturesoules on its surface, higher Rbecomes important to reduce heatmodule can be installed withtlt, adhesive or fasteners. (See Figinsulationho aspha s, transfer from the PV modules to the building interior. Higherloadingure 7.) heat lationuilding withoutgoodinsu canincreaseb coolingcosts,andthe designermake sure the existing HVAC system can handle the addi PMRSystems should tional cooling load. New construction will need to be designed with high Protected Membrane Roofs (P ) or inverted roof membrane assemblies erMRdemand loads in mind.(IRMA) have been in use by the roofing in try for overRecently, dus 30 years. two manu - T.Clear Corpor and Powerlight Corpor ion- have facturers ationatS dModified-Bitumen Roofscreated new solar laminated, in roof tiles. T.Clear laminated a tandar andsulatedne Conti one nuedpag 11"