WebJul 30, 2010 · Factual Questions. Una_Persson July 30, 2010, 11:33pm #1. Assume that I have an attic which currently has 2x6 joists on 16-inch centers. If I sister a 2x8 to each 2x6, meaning that the bottoms of the joists line up but the top of the 2x8 is approximately 2 inches above the top of the 2x6…is there a span table for such a situation, or any rule ... WebJan 6, 2024 · A sister joist is used to repair a bad floor joist. However, it can also bridge the span distance between two beams. When repairing a bad floor joist, a sister joist should …
Replace or sister floor joists DIY Home Improvement Forum
WebThe best way to strengthen floor joists from underneath is to make a supporting mid-span beam or wall beneath the wobbling joists. Using jack posts or 6×6 posts and 2×10 or 2×8 … WebApr 22, 2013 · Joists sag for one of several reasons. 1. They were undersized to begin with, and they deflected elastically under load. 2. Even if properly sized, all wood structural … optical target locator
How to Strengthen Floor Joists Before Finishing an …
WebDec 15, 2024 · Install the Sister Joists . Fit each new joist in place next to an old joist so their faces make full contact and their top edges are flush. Nail the sister to its mating joist with 10d common nails. Also, nail each sister … WebJun 27, 2024 · 2x6 joists at the span that you are talking about (16' and 18') are not strong enough to support a floor as a living space. With a span like that the timber size that you sister in would have to be at least 2x10's. Look this up in a joist span table (available in numerous places on the web) if you do not believe me. WebIf that's true,I would center plywood on hole,use hole saw to cut smallest hole that accominsates wire,notch plywood for wire,put yellow glue between plywood and existing joists before nailing. Try and find 10' long sheets and I don't believe it will be necessary to sister ends with a 10' strip at center. portland cement based plaster