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Roof decks on low-slope roofs must: A contain enough joints to accommodate thermal expansion and contraction. B be adequately stiff to resist excessive deflection. C resist wind uplift forces.
Low-slope roofs have a slope of less than 3 inches in one foot (3:12). Building codes require a roof slope to be, at a minimum, ¼ inch per foot of run. Interior roof insulation is required to have an airspace between the insulation and the deck.
Which roof slope is a low-slope roof? A 15 percent slope roof. maintenance requires removal of the insulation and ballast. Which material is the MOST effective vapor retarder? Double-ply roof felt with hot asphalt. Which material is NOT used on a steep roof? Built-up roofing system.
Concrete roof decks make up approximately 13-14% of the new and retrofit low-slope construction market, according to the National Roofing Contractors Association (NRCA) 2015-2016 Market Survey. This article examines the advantages of concrete roof decks, the various types, and some of the precautions that should be taken to ensure success.
All types of roof decks on commercial buildings should be designed with a minimum slope of 1:50 (1/4 inch in 12 inches). 1 An ideal roof deck has the following characteristics: Provides a clean, dry, and even surface for nailing, mopping, or cold process applications.
Typically, low-slope roof assemblies are composed of three interrelated components: the roof membrane, roof insulation, and the roof deck. The roof system is defined as the roof membrane (including surfacing) and the roof insulation.
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.
In theory, dead-level or low-slope decks should drain, but they rarely do. Elevations of col-umns are never exact, or deck units may have a slight camber or curvature, which under normal deflection of the deck from the weight of roofing and rooftop equipment can cause portions of the roof deck to sag below the level of drains, especially if
Low-slope roof framing elements may include roof joists, roof slabs and decks, and concrete or steel roof beams. Connectors and Fasteners—Link the roof framing to the wall system and hold elements of the roof system together.
Low-sloped roof systems must use membrane finishes that offer multi-directional protection to control slower water movement. Low-sloped roofs are made of either rubber, plastics, or polymers that offer greater moisture protection and can even hold water.