b'reenRoofingUpdate Cooling the Roofthe Inside Out from Homeownerscouldseetheirwere subject tonother corrosio or summer utility billsby 8tdurability problemsandsuffered Engineers havefallpercenor more with aroof and atticfromloss of ph chan capanewasege system developed asystembeingdevelopedatthebility." Department of Energy\'s Oak RidgeInat ORNL, phase change tests that can be installedmaterials perform IconventioNational Laboratory.ikenal in a residential roofAs homeownersh b materials by absorbingt as the aveecomeheamoreandenergy c ious,temp ture increa H , costonsc era ses.owever as and attic to soak uproofing contractors, manufacturersthe material m it co n to elts,nti ues the sun\'s heat duringaveeat andengineersh beenexperi absorb large amounts of h withmenting with the use of active ther out a significant in intemcrease the day and thenmalmassc , reflectiveperatu . Th asn falls and omponents re en,ight pigmentsandcoatin radiantthe ambientp ture arou the release it back intogs,tem era nd barriers and other n techniquesliquidpha ch material ovelseange the sky at night.to reduce the amount of heat thatdecreases, it solidifiesagainand eersgealthethe gets transferredthroughtheatticEngin at Oak Rid Nation releasesstored heat tonight floor to the living space.L (ORNL) inTennesseesky. aboratory have developed athat canWith anou temperature of systemtside be installed in antial roof92degreesFah t,testsat reside andrenheiattic to soak up the sun\'st dur ORNL\'s Building T logy Cenhea echno1f: ing the daynight.release it backter show temperatures of con ~ ALL-BANin theand thenAthearttionalatticsat127tur ve 1:,./ tosky attheofdegre 1theroof system is aietaryFahrenheit vs.tempera es of newpropr attic inorganicphasechangematerial105 degrees w hAttic CABLEGUARD FALL PROTECTIONit the Dynamic sandwiched between two reflectiveH ExhaustSystem."The next eat ARoofer\'ssurfacesmadeofaluminumfoil.generationroofwillcon tof sis"Ultimate 11Thismaterialisinstalledasain refle ive materials that fraredct are Fall Protectionwee ht dynamic thermalbarrier bet ndark in color yet reflect lig as if the roof and attic area, cr sep they were white," said Bill Miller Systemarateairchan b eatingrooftheORNL\'sBuildingEn lo of nelsetweenve pes rafters. The configuration is com group. "In add ion,iers it radiant barrpatible withtraditional woodandand p c n m ials w l be haseha geater ilsteelframing technologies.More integrated into aa c sydynamictti sch ed cedI over, the new phaseange mate temthatr u uti itybillsfor rial overcomes problems th haveho rs.Theconservation atmeowneplagued phase change materials forstrategiescontributeona much the past 40 yearsgranderscale bylowering p k ea"Inthe 1970sand 1 thedem on utilities, reducing car980sand housingindustrymadeseveralbon emissions and,timately, thul ey ldai st hamoderately successful attempts tocou lead to cleanerr." If ju lf use phase change mate s saidofthe homeownersin theU.S rial ," JanKosnyofORNL\'sB dingmade sure th had R a c floor uil ey30ttiEnvelopesgroup."Whiletheseinsulation andused this roof and materialsen bu ingatticsystem,thenationcould hancedildenergy performan they wereinr ceits Btu demand by about ce,edumanycaseschemically uns le,1 trillion Btu. tab 000'