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A study by Ducker International in 2005 identified the average cost per year of a metal roof to be US$3.2 per square metre ($0.30/sq ft) while single-ply roofs stood at $6.1/m 2 ($0.57/sq ft) and built-up roofing at $4.0/m 2 ($0.37/sq ft).
Metal roofs are 100% recyclable and can be made from other recycled products. Asphalt shingles are petroleum based with other chemicals making their recycling process more toxic, most shingles are not recycled and 20 billion pounds (9.1 million tonnes) are sent to landfills every year and take hundreds of years to decompose.
Galvanized nails and sheet metal ducts are also common. Architectural grade zinc is 90 to 95% recycled. Replacement costs are negligible with a long lifetime of 80 to 100 years for zinc roofing and 200 to 300 years for wall systems. [8] This long-life durability is a key component in durability.
Grenfell Tower was clad with composite panels with a polyethylene core which contributed to the fire; these panels cost about £2 less than ones with incombustible core. There are estimated to be about 600 high-rise blocks of flats in the UK that have "similar" cladding [ 5 ] and some fire safety tests—not full BS 8414 tests—were carried ...
For example, an asphalt shingle roof costs less than a metal roof to install, but the metal roof will last longer so the lifetime cost is less per year. Some materials may require more care than others, maintaining costs specific to some materials may also influence the final decision.
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