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Feature Article
Dorothy Lawrence: First Lady of Roofing and Waterproofing
In a career in which she broke through as many barriers as she waterproofed, Dorothy Lawrence can deservedly be called “The First Lady of Roofing and Waterproofing.” Her wisdom and sage advice over the years was beneficial to scores of architects, including Frank Lloyd Wright, engineers, owners, and Division 7 contractors. Lawrence, 83, of Aurora, Ohio, died Feb. 19, 2008. She was the owner of the Laurenco Company and fellow member of A.S.T.M.

Digital Edition, page 30



Metal Details Key to Shopping Center Design
Situated on 49 acres near Scranton and Wilkes-Barre, Pa., and featuring more than 320,000 square feet of retail space, the Shoppes at Montage rivals any of the local shopping malls in its overall area and size. A major part of each of the Montage stores’ identities is the metal fascia and coping used along the building’s roof edges and downspouts. Manufactured by W.P. Hickman from Asheville, N.C., these innovative products are available in a variety of colors, shapes and sizes that allowed each store to customize its look and feel.

Digital Edition, page 14



Roofing Details: Internal Roof Drains
Roof drains are provided throughout the roof to remove water from the roof surface. The National Roofing Contractors Association (NRCA) and most membrane manufacturers require the removal of ponded water from the roof surface within 48 hours after a rainfall. This is accomplished by locating internal drains at low points of the roof or at points of maximum structural deflection.

Digital Edition, page 28



Single-Ply Waterproofing Systems
The decline of built-up waterproofing systems in the past decade has led to an increase in the application of single-ply materials. Single-ply materials used in waterproofing consist of both elastomeric and thermoplastic materials. Thermoplastic sheets are available in three compositions: Polyvinyl chloride (PVC), chlorinated polyurethane (CPE) and chlorosulfonated polyethylene (CSPE or Hypalon). The most prominent single-ply waterproofing materials are butyl rubber and specially formulated PVC sheets.

Digital Edition, page 6



Waterproofing Details: Perimeter Foundation Insulation
Perimeter foundation insulation is required in colder climates to reduce the heat loss from a slab-on-grade to the below grade foundation wall. In most cases, the insulation is only required up to 2 feet below the grade since heat loss in the soil is negligible. In mild climates a 12-inch depth is sufficient.

Digital Edition, page 29





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