What's New in Roofing—by Kneeland A. Godfrey, Jr., (M.ASCE), Editor;
Serial Information: Civil Engineering—ASCE, 1978, Vol. 48, Issue 5, Pg. 61-68
Document Type: Feature article
For 75 years the waterproof membranes in roofs were made the same way—layers of bitumen alternating with layers of felt. Now for the first time prefabricated membranes of synthetics are catching on. Here are reasons why, some of the types, and case histories of use. Building owners are adding roof insulation to trim costs of heating and cooling, but this insulation may speed deterioration of the membrane. One corrective proposed is the upside down roof in which the insulation is on top of the membrane. This approach can be used on new roofs, and for adding insulation to an existing roof; case histories illustrate both. Also discussed: (1)Identifying wet spots in a roof by thermal infrared sensors and nuclear moisture meters; (2)news in metal roofs; (3)the greater weight of concrete roof structures cuts energy cost because of thermal inertia. Civil engineer's role in design of, and research on the roof structure-insulation-membrane sandwich.
Subject Headings: Roofs | Building insulation | Membranes | Case studies | Thermal effects | Asphalts | Professional societies | Prefabrication
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