Gauge Different thicknesses of metal are available, typically ranging from 29 gauge at the thinnest, 26 gauge in the mid-range, and 24 gauge at the thickest. In some jurisdictions, codes may have a minimum gauge requirement. Cost rises with thickness,
Coatings Paints, powder coatings, alloy coatings, and stone chip coatings are among the different options available. From an environmental point of view, the coatings on metal roofing are often the least environmentally friendly element of the roof. In particular, chemical compounds including Teflon, polyurethanes, acrylics, and paints can contain elements that are environmentally detrimental during their production and are spread from the roof to the ground as the coatings wear. It is very important to do thorough research on the coatings being used on any metal roofing you are considering purchasing, especially if there is an intention to collect and use rainwater harvested from the metal roof.
Shingles are milled (saw cut), while shakes are split from the log. Many of the products called shakes today are saw milled, but done so at varying thicknesses to reproduce the more random thicknesses associated with old hand-split shakes.
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Regardless of whether shakes or shingles are used, they are installed on strapping side-by-side (with a small gap to allow for expansion when wet), in horizontal courses, with successive courses set to reveal a predetermined length of the course below. The seams between shingles are offset between courses, and a cross section of the roof would show three layers of shingle at any point in the roof. The shingles come in
Asphalt shingles can be made with an organic (paper or wood fiber) or fiberglass base, saturated with asphalt and coated with mineral granules to protect the base from UV radiation. Though it is a popular and affordable roofing, it is incompatible with many basic sustainability goals:
Ecosystem impacts: The full “chain of ~ custody” for asphalt products needs to consider the wide range of ecosystem impacts of oil exploration, extraction, shipping and pipelining, refining, and processing. Pollution emitted during asphalt production is dangerous to soil, water, and the human nervous system.
Embodied carbon: Asphalt products have frn a high carbon footprint.