b'Q:In a large number of6.Probable weather conditions cases, the owner, architect and roofing con 7.Defects on deck or walls tractor are speaking different lan 8.How much offor roofthe deck is ready guages on basic roofing terms.ing .,,Thus, to help keep the lines of com 9.Material storage areas on the ground ana-/J munication open, the following par on the roof tial list contains words and phrases10. Numberlevels on roof of that will come up in the discussion11.Slope of roof of roofing and quality control. Such questions are asked to define application rate, bitumen, quality control, square, substrate, tolerance and voids, to name a few. A:Application rate is the quantity (mass, volume or thickness) of material applied per unit area. Bitumen is a t semisolid mixture of organically de \\ rived hydrocarbons. Two types of bitumen are used in roofing: asphalt and coal-tar. Quality control is the monitoring of a roof system application to ensure that the materials are being installed and appliedQ:What maximum moisture content is reaccording to specifications. Squarequired for aggregate (crushed stone and gravel) is the term used to describe 1square feet ofapproval used on built-up roofs, and how can it 00 roof area. Substrate is the surface that thebe checked in the field? roofing is installed on the structural deckin A:According to ASTM D1863,"Standard or sulation. Tolerance is the amount by which aSpecification fored Mineral Aggregate Us on quantity is allowed to vary. Therefore, the toler Built-Up Roofs," the maximum should be 2.0 ance is the algebraic description ofpercent. Suggested field checks: the maximum and the minimum limits. Voids are areas1.Aggregate should be free of ice and snow between two plies of a built-up roof membrane2.A handful of aggregate shall not drip felt emin which there is insufficient bitumen orwater bedment.3.The aggregate should be dry and clean BY BOB I.A(OSSE,CAEenough to adhere to the hot bitumen Q:What are all offlood coat when installed the things that must be checked in a job analysis for a low-sloped roof before a cost can be prepared by the estima Q:What is the difference in composition betor?tween coal-tar pitch and coal-tar bitumen? A:Depending upon any unusual designA:In ASTM D450,"Standard Specification and/or additions to the building that couldfor Coal-Tar Pitch UsedDampproofin Roofing,change the cost, the following must being and Waterproofing, " coal-tar pitch is classichecked in the job analysis.fied as Type I and coal-tar bitumen as Type Ill. 1.Type ofThe only distinction between the two, as debuilding a.Length, width and heightscribed in ASTM D450, is that Type Ill has less b. Area of roof, number of squaresvolatile components than Type I. Also. Type Ill c. Number of linear feet of flashingscoal-taris manufactured by one combitumen 2.Specificationspany. Therefore, its composition or contents is 3.Estimated day\'s labor production accord proprietary. ing to roof area conditions 4.Accessibility 5.Total tonnage of materials MR May 96'