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keith3267
Re: sistering a new joist

Once again guys, if he covers the full span, he does not have to mechanically bond the two joists together so it does not matter what he uses for nails or screws or if he uses any at all. It would be like a replacement joist only without removing the old one.

jkirk
Re: sistering a new joist

wood screws will bend but in a lamination the two pieces of wood wont shift so much that the fastener will be effected if the correct amount of fasteners are used and spaced correctly

Gizmo
Re: sistering a new joist
keith3267 wrote:

Once again guys, if he covers the full span, he does not have to mechanically bond the two joists together so it does not matter what he uses for nails or screws or if he uses any at all. It would be like a replacement joist only without removing the old one.

If the two joist are tight against each other without any mechanical bonding it might create a squeaking problem. :rolleyes:

Sombreuil_mongrel
Re: sistering a new joist
keith3267 wrote:

Once again guys, if he covers the full span, he does not have to mechanically bond the two joists together so it does not matter what he uses for nails or screws or if he uses any at all. It would be like a replacement joist only without removing the old one.

Ok, this is just silly. He would have to re-fasten the entire flooring and sheathing to the new joists. You generally can't do that unless the finish floor is removed; hence the importance of fasteners. The joist isn't there to look good and lend emotional support...
Casey

jkirk
Re: sistering a new joist
Sombreuil_mongrel wrote:

Ok, this is just silly. He would have to re-fasten the entire flooring and sheathing to the new joists. You generally can't do that unless the finish floor is removed; hence the importance of fasteners. The joist isn't there to look good and lend emotional support...
Casey

lol i love that last part

function
Re: sistering a new joist

Actually - there is no subfloor, so fastening the floor to a new joist is no issue. The joist kind of is going in for sake of appearance and emotional support. I cannot handle the thought of a partially termite-riddled joist, even though the infestation is no longer active, and the emotional support kicks in whenever I go to sell the place 10-15 years from now and an inspector sees reinforcement done where not necessarily structurally needed at the time but done for the sake of maximum safety.

keith3267
Re: sistering a new joist
Sombreuil_mongrel wrote:

Ok, this is just silly. He would have to re-fasten the entire flooring and sheathing to the new joists. You generally can't do that unless the finish floor is removed; hence the importance of fasteners. The joist isn't there to look good and lend emotional support...
Casey

I think you just missed my point. In my first post, I recommended thru bolts, but this thread melted down into an argument over the advantages of one type of faster over another. The point I was trying to make was that in this case, it didn't matter.

It would have been a lot more important if the sister didn't cover the whole span. Then it becomes more critical.

function
Re: sistering a new joist
keith3267 wrote:

It would have been a lot more important if the sister didn't cover the whole span. Then it becomes more critical.

Ok, for the sake of my knowledge and since I love to ask questions, what if I only sistered from the beam on the perimeter to the beam in the center of the room?
I'll say it is 7'6" span since I haven't measured exactly. That would put one end on a 6x6 beam and the "inside" end on a 4x4 beam.

dj1
Re: sistering a new joist
function wrote:

Ok, for the sake of my knowledge and since I love to ask questions, what if I only sistered from the beam on the perimeter to the beam in the center of the room?
I'll say it is 7'6" span since I haven't measured exactly. That would put one end on a 6x6 beam and the "inside" end on a 4x4 beam.

This thread is going nowhere like this.

To answer your last question, nail the two joists together.

function
Re: sistering a new joist

Sorry if it seems like I was baiting, I like to gather knowledge from many sources, and the experienced contractors and others here are great for me as my background is insurance and DIY.
If anybody out there has questions about their worker's comp insurance for their contracting company, I'm glad to help from that end.

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