Adhesive Fastening of Insulation to Structural Decks February 09, 2003 February 2003 Interface • 17 Traditionally, insulation has been attached to structural roof decks with either hot asphalt or mechanical fasteners. Multi-layer insulation systems have also been bonded together with asphalt. In the majority of cases, this is still true; however, a number of special circumstances may dictate that an alternate attachment method be used. […] Read More
Dispersion February 09, 2003 6 • Interface February 2003 To perform at their best, polymer modified bitumen (PMB) roofing products must have the asphalt dispersed throughout the polymer. There is currently no standard test for the level of dispersion or for the “dispersion grade” in a sample of PMB roofing. We have developed a guide to measure dispersion. It […] Read More
New Concepts and Materials for Roof Designers to Consider February 09, 2003 28 • Interface February 2003 Roof consultants and designers select membranes to use in their specifications primarily based on performance. Since performance is measured in years of leak-free service, we are forced to think in the past, not the future. New materials are not directly sought out or met with open arms in the roofing […] Read More
Mechanical Fasteners Get to the Point in Providing Roof System Success February 09, 2003 February 2003 Interface • 23 Mechanically fastened roofing systems have played a significant role in the impressive market gains achieved over the past 20-plus years by flexible membrane systems. Mechanically fastened seams make up a significant portion of the flexible membrane market and represent almost half of the total square feet of thermoset and thermoplastic […] Read More
Wood and Moisture January 14, 2003 INTRODUCTION Wood is used in virtually all aspects of construction, including, but not limited to foundations, shoring, forms, siding, framing, columns, beams, girders, joists, flooring, trim, sills, plates, rafters, trusses, blocking, and, nailers. A basic understanding of wood and its characteristics will help in its proper selection. As our forefathers did, use care when selecting […] Read More
The House Roof Story January 14, 2003 INTRODUCTION In the coastal area of the east Adriatic, in Croatia, there are many old stone houses. Chiseled stone blocks, 60 cm or thicker, were once used for external protective and load-bearing walls. Slanted stone tiles were used on pitched roofs. In the medieval towns of the southern Croatian province of Dalmatia, most of the […] Read More
Recommending Repairs: Are You Up to the Challenge January 09, 2003 By David Velcheck, CCS Ameeting is set with a building owner who has been referred from a great client. The meeting goes well, and the proposal for the roof survey is returned with a signature. The fieldwork is started, and the property manager explains, “We have a few leaks, and the budget is tight; we […] Read More
Cardinal Change Has Major Implications January 09, 2003 January 2003 Interface • 29 For some people, a Cardinal Change is the retirement of baseball slugger Mark McGwire. For others, a Cardinal Change is the pope’s appointment of new members to the College of Cardinals. For contractors, a Cardinal Change may be a drastic modification or fundamental alteration of the scope of a contract, […] Read More
Uplift Resistance of Existing Roof Decks: Recommendations for Enhanced Attachment During Reroofing Work January 09, 2003 Photo 1: This aggregate-surfaced, built-up membrane blew off as a result of lifting and peeling of the metal edge flashing. Historically, lifting and peeling of edge flashings and copings (and subsequent membrane lifting and peeling) have been the most common wind failure modes for membrane roofs. 14 • Interface January 2003 Introduction Although deck failure […] Read More
Construction and the Economy: Repercussions From the Elections Begin January 09, 2003 January 2003 Interface • 35 The repercussions from November’s elections have just begun. The 107th Congress reacted to the election in at least two ways that are important to construction. First, Congress passed a long-stalled federal backstop for terrorism insurance, as President Bush had urged in campaign appearances. A survey by the Real Estate Roundtable […] Read More
