All roofs and walls must therefore shed rainwater, and resist water penetration. Ponding water: The current roof system and/or deck of the building may not drain well and may cause water to pond (accumulate) in low-lying areas of the roof. In short, the roof deck is the roofing material that lays between the structural components of a roof (the joists and trusses), the insulation, and the waterproofing layers (coatings, roofing materials, layers, etc). Ponding can be an indication of structural distress and may require the review of a professional structural engineer. Pitched roofs in cold climates need to be designed to prevent ice dams. Courtesy Edmonton Roofing. In roofing, ballast comes in the form of large stones or paver systems or light-weight interlocking paver systems and is used to provide uplift resistance for roofing systems that are not adhered or mechanically attached to the roof deck. For example, roof drainage design must minimize the possibility of ponding water, and existing buildings with flat roofs must be inspected to determine compliance with this requirement. In roofing, crushed stone, crushed slag or water-worn gravel used for surfacing for roof coverings.. BALLAST. Drainage: Vegetative roof drainage design must both maintain optimum growing conditions in the growth medium and manage heavy rainfall without sustaining damage due to erosion or ponding of water. What is Roof Decking? In a report in 2014, entitled “National Climate Change Assessment,” prepared by the U.S. BALLAST. Roof slope definitions & measurement methods: this article defines different types or degrees of roof slope and explains how roof slope, ptich, angle, or grade slope are measured & expressed. Ponding water on a roof. We give the required roof slopes for different types of roofing materials and we illustrate several methods by which the slope or pitch of a roof is easily measured. In roofing, crushed stone, crushed slag or water-worn gravel used for surfacing for roof coverings. AGGREGATE. In roofing, ballast comes in the form of large stones or paver systems or light-weight interlocking paver systems and is used to provide uplift resistance for roofing systems that are not adhered or mechanically attached to the roof deck.
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