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Joist sistering splice plate11/11/2023 ![]() Something else would be happening with the joist support. If these joists are spliced in the middle, it wouldn't cause a slope to one end of the joists. Stillers, CTW, houseguy & I could use some clarification. ![]() Check with your state on whether an engineer is required.ĪZ Phoenix area RE: Fixing a 2x10 floor joist jenDL (Civil/Environmental) 10 Dec 09 19:50 Than nail the strap (and add new nails to the add-on) onto the joist and blocking/add-ons than remove the jacks.Īnd please understand that you should get all the required calculations for your condition done by someone capable to do them before doing the repair. Jack up the joists at least 1/4" higher than the adjacent uncut joists. Use one nail to tack the strap in place at one side of the cut. Any nails that do split the lumber can not be counted toward the total number of nails required. Nail one half to the joist and the other half to 2x blocking using the alternating nail holes and angle the nails toward the center of the 2x to avoid splitting the joists. For a greater loading or spacing a 3" wide strap would be required. If you used a 1.5' wide metal strap like a Simpson CS14 at a 50 (40 Live and 10 Dead) psf total load, the joists would need to be 8" o.c. Also place a bead of floor glue on top of the new joist. maximum joist spacing, at each end and 4" o.c. Connect with a cluster of 30-10d common nails (0.148" dia.), for a 55 psf total load at 16" o.c. Jack up the joists so that the new joist bottom side matches the cut joist bottom side. Personally, if it was my house given what I paid for it, I would remove the pipes and ducts to nail new joists (of the required grade and spanning from inside of bearing to inside of bearing) to one face of the cut joists. If i understand things correctly, I would expect the slope to be more or less centered RE: Fixing a 2x10 floor joist Stillerz (Structural) 10 Dec 09 09:05 I'm curious how the cut is in the middle but the slope is within 4 foot of the corner. (4 or 6 bolts each side of the cut or 8 to 12 bolts total on each 8 ft piece that is scabbed in place) I would start with 2 or 3 bolts at each end of the 4 foot distance of joist piece that is on each side of the cut. A similar connection would be needed on each side of the crack. The 8 ft pieces that are in place now MIGHT be sufficient IF they can be attached to the original joist in a manner that is sufficient to develop the bending moment that is present. ![]() MAYBE this can be accomplished with by jacking the joist up prior to installation of the strap. In addition, especially for the metal strap, I would think some form of "pre-tensioning" or other "pre-loading" to get the tension into the strap will be needed. Haven't done the calculation but just guessing. It seems that nailing a 2x4 or a steel strap to the bottom of a joist will be difficult to do so enough to achieve sufficient shear transfer. RE: Fixing a 2x10 floor joist racookpe1978 (Nuclear) 9 Dec 09 22:09 If option a), should I calculate my nail spacing such that the inverted "T" beam would have the same amount of deflection as a comparable 2x10 based on L/360? Would I need to add a 2x4 over the entire length (16ft)? Or how can I calculate the necessary length required for the 2x4? Would it be as easy as just decreasing the nail spacing by half if I would use an 8 ft long 2x4 as long as I am not splitting the 2x4? Now I would like to repair it - appropriately.Ī) lift the joists (using a jack) one by one the appropriate amount and nail a 2x4 to the "notched" 16' long 2x10's from the bottom? (To make an inverted "T" beam)ī) lift the joists, slide in new continuous joists and remove the "old" ones? That would be rather involved since gas and electrical lines are going through the joists. Obviously not a good solution.Īnd shame on me for not noticing 4 years ago. The builder "fixed" it by nailing one 8 foot long 2x10 next to each of those. Taking a closer look in the basement under this room, I noticed that 3 floor joists (16 feet long) have a cut in the center about half way through (on the under side). While renovating a room in my 4 year old house I noticed that the floor has a slope of about 1" within 4' in one corner.
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