Share these talks and lectures with your colleaguesInvite colleagues
The evolution of plaza waterproofing in America
Plazas over occupied spaces proliferated when they became feasible for below-grade activities. Their usage was spurred by the advent of air-conditioning and city incentives for open spaces. Coal tar pitch waterproofing membranes, which had provided reliable waterproofing with split slab construction, fell out of favour as a result of the shortage of coke, the labour-intensive application costs, and the imposition of stringent VOC requirements. Asphalt-based substitutes failed to perform because differential movement of the wearing courses imposed stresses beyond their capabilities. As a result, investigators recommended divorcing wearing surfaces from drainage courses and later insulation layers. This freed waterproofing manufacturers from the need to develop membranes that could absorb the shear stresses that destroyed multiple-ply asphalt systems. After World War II, advances in polymer chemistry fostered the development of liquid-applied membranes. These, along with imported elastomeric sheets from Europe and rubberised asphalt from Canada, revolutionised the plaza waterproofing industry.
The full article is available to institutions that have subscribed to the journal.
Justin Henshell FAIA, FASTM is a principal in the firm of Henshell & Buccellato, Consulting Architects in Shrewsbury, NJ, USA and has specialised in moisture-related issues in the building envelope since 1974. He is a registered architect in six states, a Fellow of the American Institute of Architects, a Fellow of ASTM International and the recipient of many awards for outstanding contributions to the advancement of building technology. He has authored more than 57 technical articles and papers and presented them in the USA, Canada and Europe. He is the principal author of two ASTM standards on waterproofing design and the author of The Manual of Below- Grade Waterproofing Systems published by Routledge in 2016.
CitationHenshell, Justin (2017, June 1). The evolution of plaza waterproofing in America. In the Journal of Building Survey, Appraisal & Valuation, Volume 6, Issue 1.