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-   -   Tying in floor joist to existing structure (http://www.diychatroom.com/f19/tying-floor-joist-existing-structure-43615/)

hebrewdiver 05-01-2009 02:11 PM

Tying in floor joist to existing structure
 
I am expanding/extending my current bedroom and bath which will require removing rear exterior wall. My question is when tying in the new floor joist I plan to use 2x10 with one end sitting on the top plate of the new wall and the other I plan on using joint hanger to tie it into the existing rim board. will I have to double up the existing rimboard like I would for adding a deck? If I dont I know I will have 1" of nail sticking through the backside of the existing rim board going through the joist hanger.

Gary in WA 05-01-2009 02:43 PM

Depends on where you live. Fl and LA are a lot stricter. To use shorter nails reduces the load accepted on the hanger. What does your plan say? The Inspector will look for this, for your family's safety. You could just cut an 1/8" wider space than joist width, and bear the new ones on the house sill plate, then nail to existing joists. You would then have your solid blocking required for rotation and fire-stop.

http://www.strongtie.com/products/co...rs/LUS-HUS.asp Be safe, G

Ron6519 05-01-2009 04:06 PM

You're removing the back wall of the house to expand the living space. There needs to be a header engineered for the new combined load. I just didn't see it mentioned in the post.
Ron

hebrewdiver 05-01-2009 07:30 PM

I using 2x10 over a 12'6" span the floor joist or part of a 2 story addition extending master bedroom and master bath. The deminsion of the project is 12'6" x 24'. I will be using 18 2x10 16" on center for the floor system on upper level the lower level is monolithic slab for floor. So Does the length of the nails going through the existing rim board which I will be attaching the joist to using joist hangers matter and should I use a ledger board under the hangers? As far as the engineered beams are concerned are you referring to the ceiling expansion (roof joist)for the roof? I don't know if I will be using LVL or dbl/triple 2x8 lumber.

SNC 05-01-2009 07:44 PM

Quote:

Originally Posted by hebrewdiver (Post 268157)
So Does the length of the nails going through the existing rim board which I will be attaching the joist to using joist hangers matter and should I use a ledger board under the hangers?

you do not need a ledger if you are using hangers.

are you talking about the joist hanger nails ?
if so, you have 1 1/2 " nails thru the flanges
the sides must be 2 1/2" nails IF they are "double shear" hangers.
double shear hangers will it stamped into the metal saying so

you need these longer nails in the side because they extend into the band board or header because there are fewer nails in the flanges.

I have seen many builders just use all 1 1/2 inch nails and the instectors never check.


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