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. � � <br /> Technical Bulletin # 104 <br /> � Polyiso R-value Determination Methods <br /> MRX�. <br /> There are at least two R-value conditianing methods currently in use for Polylsocyanurate <br /> (Polyiso) foam. Bo[h methods aie outlined in the turrent version of ASTM C1289 <br /> "5[andard Spetlfication for Faced Rigfd CeUular Polyisocyanura[e Thermal Insula[ion <br /> Board". This standard covers Commercfal and Residentlal Poly(so foam insulatlon produc[s � <br /> as well as Roofing, Sheathing, Cavity Wall and Exposed products. A produc[ could be a <br /> Residential or CommerUal Produc[as well as a Roofing, SheatMng, Caviry Wall or Ezposed <br /> Product. <br /> The first conditloning method is frequently referred to as PIMA (Potyisocyanuro[e <br /> Insulation Manufacturers Assocfation) 1CL �n this me[hod sample boards are condi[ioned <br /> for 180 days at 73 ./•4`F(23 +/- 2'q and 50 �/• 5%relative humidiry prlor ta testing or <br /> at least 90 days a[ 140 +/• 2'F(60 G 1°C)dry hea[ prior[o testlng. Once Ihe boards have <br /> been condilioned their R-value is measured using ASTM C777, Q36, or C518, This was[he <br /> Indus[ry standard me[hod for more than a dxade and con[inues ro be[he standard for all <br /> impermeably faced products. These are ASTM C1289 Type I (aluminum(oil on bo[h sides) <br /> products. <br /> Impermeably faced products may be used both in commerclal roofing and sheathing <br /> applications as well as in residentlal roofing and sheathing applications. The above <br /> conditioning method is the only me[hnd iden[ified in ASTM C7289 for use wi[h <br /> impermeably(azed(ASTM C1289 Type q produc[s. <br /> Some permeably /aced products are sold quo[ing [he conditioning method described <br /> above These arn Type II (Glass flber minforced ceUulosk felt or uncoated or coa[ed <br /> polymer bonded glass fiber ma! on bo[h sides) and Type V produc[s (Oriented s[rand <br /> board or wafer board on one side and glass fiber reinforced rellulosic felt or uncoated or <br /> coated polymer bonded glass fiber mat on the other side) [hat are sold into the <br /> residential markeL The mndi[ioning me[hod for insulatlons sold in[o [he residentfal <br /> market is controlled in large par[ by the Federal Trade Commissfon (FTC).The recognized <br /> conditioning me[hod for all residential products is the PIMA 101 method. The FTC wlll <br /> however acmpt the newer long•Term Thermal P.esisWnce me[hod (ASTM C1303/CAN-ULC <br /> 5770�where applicable � which currently would only be for Type II and Type V produc[s. <br /> Corpora[e&Sales 0/(ice <br /> Rmax • 13524 Welch Road, Dallas, Texas 75244-5291 •972 - 387-4500 <br /> Faz:(972)387•4673-Email:Rmaz�rmaxinc.com•Web Site:www.rmaxinc.com <br /> Plants:Dalla:,TX Fernley,NV Greer,SC <br /> Page 1 of 2 � <br /> Rev. Date 061008 /� <br /> L <br />