How to Repair a Cracked Floor Joist | Ask This Old House


Home Repair , How to Repair a Cracked Floor Joist | Ask This Old House , 23amU7EWy7g , https://www.youtube.com/watch?v=23amU7EWy7g , https://i.ytimg.com/vi/23amU7EWy7g/hqdefault.jpg , 1181721 , 4.84 , This Old House general contractor Tom Silva helps a homeowner repair a cracked floor joist. SUBSCRIBE to This Old House: … , 1451739600 , 2016-01-02 13:00:00 , 00:09:58 , UCUtWNBWbFL9We-cdXkiAuJA , This Old House , 8062 , 263 , , , , https://www.youtube.com/watch?v=23amU7EWy7g

23 COMMENTS

  1. Jack up the sagging area(s) with lally column(s) as needed to level the floor over 6 – 8 -12 months or so. When the floor is level, sister the joists on each with 1/8 or 3/16 steel cut to the width of the joists over the length of the run. Be sure to butt the steel up to the floor above. Through bolt the steel on the ends and on a staggered basis every 12 – 16 inches or so (You might consider stainless steel bolts.). That floor simply will not sag again. Did this with a long unsupported run in a shed with a 4 inch sag in the floor. Now I park the car on the floor…

  2. House builders 100 years ago didn't anticipate a 400 pound refrigerator . The glue used would not be the best choice of glue , but would be "adequate" … as well as the joist hanger . A permeating wood dryer and bonder should take care of the possibility of wood rot and be the precursor to glue / adhesive .
    A 10 gauge steel plate should be added across the crack in the floor joist and a steel post floor jack should be added . Adjust the floor jack Gradually over weeks and the dip in the floor should turn to level .  
    I'm seeing long expanses in the floor where the load bearing is not supported by floor jacks or supports . The home is actually holding up very well .

  3. You should never use a 2×4 to jack a beam like that, minimum should be a 4×4, as a 2×4 will flex too much. I also would've left the jack in place until the glue cured, at least 24 hours. I'd also add a mending plate on both sides of the joist just so the crack didn't extend any further.

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