Roof penetrations can be categorized by whether the roof is sloped or flat. The preferred method of flashing penetrations through flat roofs involves the construction of a curb around the opening. Small penetrations often do not require curbs. Sep 13, 2011 · Flashings and penetrations account for nearly 80 percent of all reported roof leaks. Therefore these areas are perhaps the most critical components of any roof system, but they are particularly important when it comes to low-slope standing seam metal roof systems. This detail shows a roof-to-wall transition at a headwall. Detail courtesy of the Western States Roofing Contractors Author: John D'annunzio.
About this chapter: Chapter 9 addresses the design and construction of roof assemblies. A roof assembly includes the roof deck, substrate or thermal barrier, insulation, vapor retarder and roof covering. This chapter provides the requirement for wind resistance of roof coverings. Fasteners shall have a minimum penetration into the sheathing. Asphalt roofing shingles are manufactured in an overwhelming variety of styles and colors. It’s important to select a shingle profile that respects and complements the architecture of your home. Some profiles are straight, while others are contoured to mimic the look of .
www.smacna.org. Roof Jack: a metal bracket used to support toe-boards on steep-slope roofs. Roof Slope: the angle a roof surface makes with the horizontal, expressed as a ratio of the units of vertical rise to the units of horizontal length (sometimes referred to as run). For English units of measurement, when dimensions are given in inches, slope may be.
History of Architectural Metals First used by the ship building industry—lead used in the 1500s with rolled copper use starting in late 1600s New York City Hall used copper for roofing circa 1764 A copper roof was used on the rebuilt Old Senate Chamber in 1819; replaced in a 1900 renovation. • the length of the roof from ridge to gutter; and • penetrations that cause nearby valleys to carry extra rain diverted from valleys obstructed by the penetration (Figure 2.14.1). The maximum recommended roof lengths for drainage for each profile are given in Table 2.14.1 of the LYSAGHT® Roofing & Walling Installation Manual.
VA Standard Details were updated in early 2009, Div 22 and Div 26 in early 2014, and the Steam portion of Div 23 in late 2017. The numbering system relates to specification MasterFormat 2004. Roofing shingles and materials, plus factory-certified roofers (including ratings from real homeowners!) from North America's largest roofing manufacturer. Residential and commercial roofing, shingles, slate, roof ventilation, roof underlayments, asphaltic and TPO roof membranes.