Decks often fail due to overloading, if not from poor design and construction. However, one expert suggests being wary about another way decks can fail: swaying. Unlike vertical forces, horizontal ones caused by side movement don’t need to reach maximum weight capacity to force a deck to give way. This type of deck failure, according to Washington State University’s Composite Materials and Engineering Center director Don Bender, is rarely reported in the news.
http://schaferconstructioninc.com/lateral-failure-deck-failure-san-francisco-deck-builders-warn/
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