b'Depending upon the installation pattern of insulation, seams at field joints of the membrane may be problematicdimension was reported between 1/16Conclusionsand .They also reported the specifiedIf the knit lines are deep enough, it is possible thickness of the board measured rangedfor the facer to be unadhered.Over the width of from 2 to 2.5 the board, this may result in a significant enough 3.Do insulation shipments arrive properlyarea to create wind up-lift performance issues.packaged? As noted from the survey results, board 71 % of respondentsYes thickness variations may create an R Value Comments made in addition to theconcern.As tolerances, according to ASTM question include: standards are not met, R Values may be Moisture in the bundles with wet facers. compromised. Also, the attachment of boards to one another, or the cover board may be a problem. Damage during loading. Depending upon the installation pattern of Coated glass facers arrive wet. insulation, seams at field joints of the membrane Improperly tarped during shipping.Tornmay be problematic.Deep knit lines may increase wrappers. the likelihood of voids, fish mouths, and cold 4.What is your preferred installation methodwelds in thermoplastic membranes. direct to facer, or use a cover board?MRCA recommends the contractor to check 71 % Cover Board each shipment for the tolerances discussed above.5.If the membrane is applied directly to theIf the product is out of compliance, contact the polyisocyanurate, have you experiencedmanufacturer for their recommendation.Where esthetic appearance challenges? possible, utilize a cover board within the system. 64 % Yes Please, send us your photos, and concerns with shipments of material arriving on your jobsites.www.mrca.orgMidwest Roofer 47'