This paper deals with the design and construction of details pertaining to insulated roofs for new construction and for thermal upgrading of existing ones. Emphasis is given to built-up roofs (BUR) because of their wide use and the particular problems associated with the tendency of the membrane to shrink. Roof problems encountered in current practice are analyzed and practical solutions are suggested. Such solutions may be adopted as principles that can be applied, in general, to the design of practical roof details. Examples of the application of these principles to thermal upgrading of existing roofs are described. Finally, the functions of the different types of joints usually found on roofs and the effects of insulation on their design are discussed.
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