Design of Mechanically-Attached Base Sheets in Built-Up and Modified Bitumen Roofing August 01, 1999 Design of Mechanically-Attached Base Sheets in Built-Up and Modified Bitumen Roofing By Colin Murphy, RRC and Robert Mills Roof systems ore subjected to a wide variety of environmentally-driven forces that designers of components and systems must consider when specifying a roof system. One of the most important considerations is the wind-induced pressure fluctuations that […] Read More
When “Paid in Full” Really Isn’t August 01, 1999 When “PAID IN FULL” Really Isn’t By Judy Gedge Break out the champagne! You’ve finally gotten a check on a long overdue account from Acme Inc. But on closer inspection, you see a marginal notation on the bottom corner of that Acme check. It says “payment in full.” “That’s crazy,” you say to yourself. […] Read More
Post-Installation Field Evaluation of a Pressure-Equalized Single-Ply Roofing System to Determine Drying Effects on a Moist, Cementitious, Roof Deck August 01, 1999 Post-Installation Field Evaluation of a Pressure-Equalized Single-Ply Roofing System to Determine Drying Effects on a Moist, Cementitious, Roof Deck A consulting assignment allowed evaluation of moisture content within the lightweight insulating fill on a high-rise commercial building, both before and after roof membrane removal and replacement using a single-ply thermoset roofing system installed in […] Read More
Safety and the Roof Consultant July 19, 1999 SAFETY and the Roof Consultant By Nelson Hall To date I am not aware of a fatal roof-top accident involving a Roof Consultant. If it hasn’t happened already, it is only a matter of time. It will happen. During my career in the roofing industry I have known people who have been injured and even […] Read More
Consolidation in the Roofing Industry May 01, 1999 Consolidation in the Roofing Industry By Robert W. Lyons, FRCI INTRODUCTION It is the dawning of the New Millennium! And by all signs and forecasts, we are in for exciting times. We are seeing significant changes in technology and in the world markets that will be driving these changes. Here in the U.S., we […] Read More
Wind Becomes Weather at RICOWI Meeting May 01, 1999 Wind Becomes Weather at RICOWI Meeting Hail Included Since Meeting in Conjunction with RCI By Philip D, Dregger, PE, RRC, FRCI Meeting in Charlotte, North Carolina as part of the RCI Convention, The Roofing Industry Committee on Wind Issues (RICOWI) voted to amend its bylaws to become the Roofing Industry Committee on Weather Issues, Inc. […] Read More
Chemistry and Microstructure of Polymer-Modified Coal Tar April 01, 1999 Chemistry and Microstructure of Polymer-Modified Coal Tar Styrene Asphalt Butadiene By Steve Ratcliff and Frank 0. Moore Jr. Figure 1 — Polymers and bitumens are the building blocks of polymer-modified roofing materials. Shown here are the molecular structure of styrene and butadiene. which are the polymer compounds commonly used to modify asphalt. Styrene (30%) […] Read More
The Interconnected Physics of Roof Components April 01, 1999 The Interconnected Physics of Roof Components Lyle D. Hogan, PE, FRCI, RRC Lip-attached roofs RESPOND DIFFERENT IY Abstract: Roof construction is founded in physics. As disturbing as that may be, the concept is encountered daily. Behavior of roof assemblies (including the various substrate types) is somewhat predictable when examined in the backdrop of physics. […] Read More
Assessing Risk of Condensation in Low-Sloped Roofs Based on Basic Scientific and Probabilistic Principles April 01, 1999 Assessing Risk of Condensation in Low-Sloped Roofs Based on Basic Scientific and Probabilistic Principles By Hitesh Doshi Moisture and Roofing Roofing performance is dictated to a large extent by how well it can prevent water leakage. Water can affect the performance of a roofing system in different ways. Visible water leakage through the roof […] Read More
Corrosion of Metal Components in Wood Construction March 31, 1999 Corrosion of Metal Components in Wood Construction By Steven A. Mandzik, RRC, CDT White powder COVERING ENTIRE SUB-PURLIN HANGER Clean sub-purlin HANGER WITH WHITE POWDER BEGINNING TO FORM much brighter appearance when showing it to prospective buyers. Ceiling foil should not be confused with batt insulation, also faced on one or both sides with […] Read More
