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Each of these floor leveling jacks can support up to 11,200 pounds at their minimum height of 54 inches and up to 2,500 pounds at their maximum height of 150 inches. Pick up the slack by fortifying your home structures with the BISupply Crawl Space and House Jacks Adjustable Support Posts. Old houses and natural disasters often lead to cracked floor joists, rotting support beams, and sagging porches or decks.