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5 February2016 Table 1 ASTM C1363 Test Results Long Tab Banded System Liner System R-19 R-118 purlins 0.037 0.039 R-25 R-1910 purlins 0.029 0.028 lation of mechanical and electrical equipment. With the liner system the vapor retarder is installed separately from the insulation under the purlins and above the banding. With a liner the purlins are covered so they are not visible within the building. If a liner is being used it will be necessary to cut into the vapor retarder to gain access to the structural components of the building. When selecting an insulation system for a metal building roof the following factors should be considered Does insulation system meet the required U-factor Does the insulation system provide a smooth attractive installed appearance Do the facility operators need to have easy access to the purlins What is the installed cost and long-term performance Rigid Continuous Insulation Continuous insulation is defined in the 2015 IECC and ASHRAE 90.1-2013 as follows IECC-2015 Continuous Insulation Insulating material that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope. ASHRAE 90.1-2013 Continuous Insulation Insulation that is uncompressed and continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior or exterior or is integral to any opaque surface of the building envelope. Continuous insulation provides a strong durable and attractive interior finish. It is often a preferred option for use in applications where high interior humidity is present such as indoor swimming pools and nurseries. Continuous insulation is also commonly used in applications requiring a low interior temperature such as cold storage buildings. In some cases hybrid systems utilizing a combination of foam and fiber glass can be used to achieve required thermal performance. When considered these systems should be reviewed with your insulation fastener and building supplier to avoid any unintended consequences such as condensation or structural issues. When choosing continuous insulation it is advisable to confirm that the fire ratings of the products are acceptable for use by the local fire codes. Depending upon the fire rating a separate thermal barrier may be required by code. Wall Insulation High R-Valuelow U-Factor metal building wall insulation systems can also be broken down into 2 generic categories filled cavity systems fiber glass and rigid continuous insulation foam. Filled Cavity Systems with U-Factors of 0.059 or Less Several single and double layer fiber glass filled cavity insulation systems have been developed to meet the Metal Building Wallrequirements established in 2015 IECC and ASHRAE 90.1-2013.These systems include