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Lag screws or carriage bolts

Posted by Jennifer on January 8th, 2003 09:57 PM

I want to sister-up some floor joists under a planned whirlpool tub with 3/4 plywood for added support. If I put the plywood on both sides of the joist, should I use lag screws or through bolts for my best long-term results? And what should be the spacing?

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