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Abstract
Roof expansion and control joints frequently pose a set of difficult if not unusual problems to the roof designer and installer. By their very nature, an expansion or control joint on a roof has to have the ability to meet and accommodate movement (horizontal, vertial and in shear) while remaining waterproof fo rthe life of the roof. Traditionally, the approach has been to raise the expansion joint above the plane of the roof and then install flashing roof membrane around it, with the objective of moving the actural waterproofing of the joint above the water line. This approach, while having some advantages, can also introduce problems to the roof's performance over its service life. This article will examine the various methods and approaches of designing and detailing expansion and control joints in roof assemlies. Design parameters considered include the amount of movement required in a jiont and the detailing and installation procedures involved, while taking into consideration the impact of the performance of the roof. Presented also will be leading edge technology in roof joints that use a flat type of expansion jiont which accommodates tri-dimensional movements of the roof and roof membrane while remaining waterproof. An actual case study of an installation with a flat expanion joint will be examined. The advantages and disadvantages of this type of expansion and control joint will be reviewed.
Roof expansion and control joints frequently pose a set of difficult if not unusual problems to the roof designer and installer. By their very nature, an expansion or control joint on a roof has to have the ability to meet and accommodate movement (horizontal, vertial and in shear) while remaining waterproof fo rthe life of the roof. Traditionally, the approach has been to raise the expansion joint above the plane of the roof and then install flashing roof membrane around it, with the objective of moving the actural waterproofing of the joint above the water line. This approach, while having some advantages, can also introduce problems to the roof's performance over its service life. This article will examine the various methods and approaches of designing and detailing expansion and control joints in roof assemlies. Design parameters considered include the amount of movement required in a jiont and the detailing and installation procedures involved, while taking into consideration the impact of the performance of the roof. Presented also will be leading edge technology in roof joints that use a flat type of expansion jiont which accommodates tri-dimensional movements of the roof and roof membrane while remaining waterproof. An actual case study of an installation with a flat expanion joint will be examined. The advantages and disadvantages of this type of expansion and control joint will be reviewed.
Date
7/1997
7/1997
Author(s)
Kris Zielonka
Kris Zielonka
Page(s)
8-14
8-14
Source
Roof Consultants Institute
Roof Consultants Institute
Keyword(s)
expansion joint; control joint; advantages; disadvantages
expansion joint; control joint; advantages; disadvantages