pbgvdad Posted August 28, 2020 Report Share Posted August 28, 2020 (edited) 1. Several 2”x12”x16’ floor joists under a corner bedroom are showing signs of cracking and the floor is squawking in a 26 year old home. This seems to have begun or to have accelerated within the past 6 months or so. There is no sign of basement block wall cracking under the corner bedroom where the cracking joists are located. There are also no signs of plaster damage to walls or ceiling in the bedroom. The door from the bedroom to the adjacent bathroom started to hit the bathroom plank tile floor about a year ago. The only “heavy” load is a dense foam queen size mattress where an elderly 200 lb. person sleeps. What could be causing the joists to fail? 2. I want to jack the joists level and sister the worst joist with a 2”x12”x12’ board which will span the support on top of the outer block wall and a basement load bearing wall. I plan to use a few bolts and adhesive to hold the sister joist in place against the damaged joist, then nail them together before the adhesive dries. I want to nail from the sister side to help drive the joists together. However, the original joists are spaced at 16”, so the space between the sister joist and the next joist is only 13” [16 - (2x 1-1/2)]. Since the framing nail guns I am considering are taller than 13” (more like 13-1/2”), is it acceptable to nail the joists together with the gun slid between the joists so the 3” nails are driven at an angle? Edited August 28, 2020 by pbgvdad Quote Link to comment Share on other sites More sharing options...
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