bretrooks
Posts: 2871
Joined: 9/27/2009 From: San Luis Obispo, CA Status: offline
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Semi-cross-posting from the WB forum, and elaborating a little, just to share with the group here: You have to think of it as 300 pounds on each of four 2"x2" feet (or whatever the case may be), which could mean considering the ability of your floor to withstand crushing, your subfloor to span if the load comes down between joists, the ability of a single joist to potentially carry half the load of the fridge, etc. Lots of factors to consider when dealing with things like this, and the structural configuration in the area definitely comes into play. For something like this, the materials are always going to be less of a cost driver than the labor, which depends on a lot of factors too - How is access for getting materials down there and doing the installation? Are there plumbing lines or ducts which complicate things? Intuitively, I'm a little surprised that the cost for the sistering of 2x10 joists is almost as much as the jacks (even with the increase in lumber prices recently, it's just 2x10s and nails). If you're working with a quality contractor, you should be able to ask what's driving the cost there, and they should be able to give you a good answer.
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