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Floor joists sitting on air!


Chicago1908's Avatar
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05-05-12, 11:45 AM   #1  
Floor joists sitting on air!

Took off my old deck and discovered 12 ft of my sill plate and rim joist were rotted through. Contractor came out and jacked up, tore out, and replaced the rot. Now this is what my problem/ question might be.....

1) joists are now not sitting on the plates but instead are connected to my new rim joist, which is sitting on the plates. Have about 3/8 inch between bottom of joists and top of my plates. Joists run perp to rim joist btw and are2x10s. New rim joist is a 2x10 as well but clearly slightly wider than my joists

2) rim joist has hairline crack on exterior running entire length of board (12 ft). Not showing on interior.

Am I correct in thinking this is not structural sound/correct as the rim joist is not typically designed to be load bearing but simply support the joists?

Thanks for any feedback you can provide!

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chandler's Avatar
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05-05-12, 08:06 PM   #2  
Welcome to the forums! In the bottom out of focus pix, what is the joist sitting on? It appears to have something out there. If it is resting on wood, there should be at least 1 1/2" of it under the end of the joist, or a joist hanger should have been incorporated into the mix. The contractor had to match the top of the rim joist with the interior joists, so he was behind the 8 ball on that one. BUT, he could have shimmed the joists on top of the plates using oak shims from either side to spread out the weight a little.

 
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05-06-12, 08:05 AM   #3  
The 2x10 rim joist is on its end, sitting on a flat 2x6 plate, leaving appx 4 inches for the floor joists to sit on. The contractor nailed through the bottom of the plates into the bottom of the floor joists. Those are the nails you see in the gap, which is appx 1/4 to 3/8 inch where the floor joists should instead be sitting flush on the plate. The nails also will make it difficult to put in shims.

 
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05-06-12, 10:25 AM   #4  
Again, what is the joist sitting on? I see a protrusion which looks to be under the end of the joist, holding it high.

 
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05-06-12, 11:55 AM   #5  
That is just a shadow. There is nothing under the floor joists but air and a few nails driven in from below. The floor joists were jacked up and the contractor attached the new rim joist by driving nails through the exterior of the rim joistninto the ends of the floor joists. As the bottom of the new rim joist was installed slightly below the bottom of my floor joists, when the jack was removed the load on the floor joists is transferring to the new rim joist, which is sitting flush to the plates

 
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05-06-12, 12:24 PM   #6  
Cut through the nails into the top plate of the wall and clear them out. Slip in joist hangers and nail the face holes (6-8) with 1 1/2" joist hanger nails and into the angle holes (4-6) with 2 1/2" joist hanger nails. Don't worry too much about it sitting on the plate. You can refasten the joists to the plate to keep the wall stable.

 
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