Uneven bottom chords ...

[ELCouz]

Hello,
I am about to do the flooring on the bottom chords with 3/4 OSB tongue in groove. I noticed the bottom chord are not exactly 24" OC. Some chords are warped giving +/- 1" off center.

What is the best way to deal with that? Cutting each osb to fit a particular area would be PITA.

Doubling the chord so the 4x8 sheet fit half-half on solid wood?

Thanks!

 

[Hank11]

If they are just warped, blocking the whole thing back to spec will make a much better floor.

If the trusses are set off of the standard 24" center then you might be able to sister in some boards so that your standard sheeting will match up and nail. If you do this you will want to glue and nail the sisters to the bottom chord for no squeaks.

 

[ELCouz]

If they are just warped, blocking the whole thing back to spec will make a much better floor.

If the trusses are set off of the standard 24" center then you might be able to sister in some boards so that your standard sheeting will match up and nail. If you do this you will want to glue and nail the sisters to the bottom chord for no squeaks.

What about using #10 construction screws for the sistering? I don't have a framing nailer unfortunatly.

Do I have to sister the whole 2x10 ? Can I just use a 2x4 under the sheets gap?

 

[Jbullfrog]

Screws are going to be better to pull them back inline. Measure at the wall and cut your blocking then start at one side and work your way across. I used 2x4s in joist hangers for the blocking between the trusses for my shop ceiling.

 

[Hank11]

What about using #10 construction screws for the sistering? I don't have a framing nailer unfortunatly.

Do I have to sister the whole 2x10 ? Can I just use a 2x4 under the sheets gap?

I think a 2x4 under the unsupported areas should be fine, but running the full length won't hurt and would be one step more towards wonderful. Screws and glue would work. Make it really good, this will be hard to fix later if your work is not up to what's needed. C-clamp the boards together with glue as you screw so it all pulls up nice and tight.

 

[Professor Fate]

No offense, but I think a little context of the situation would help immensely. Bottom chord of what exactly and is it designed for floor loading, otherwise, why would you sheet with 3/4" T&G.

Most times when you sheet trusses you pull the chords square and onto layout as you sheet, unless you are looking at existing work, than you need to do what is needed to get proper bearing.

 

[Old tool guy]

Bottom chord of what exactly and is it designed for floor loading,

Should have been the first question asked.

 

[ELCouz]

Bottom chord of the attic truss. Contractor build the garage but I will install the floor. I noticed 24" OC is in between 22 3/4 to 25 3/4 range center to center. This will cause the sheet end (long side) to miss the chord.

Some chords are warped and other the truss wasnt installed at 24" oc.

They are 2x4 + 2x6 bottom chords designed for "living area".

Pulling the chords to 24" will distort them somewhere else no?

My first take at this. Seems simple but turns complicated ...

 

[billconner]

If sistering a 2x4 here and there puts solid wood under seams of subfloor, you'll be fine. Construction screws fine. I might stretch a string across and at least straighten the ones that bow.

 

[ELCouz]

If you wanted more context see the picture ... I already did the blocking on edge for sheet end but being a total noob I am. I cut the blocking according to gap size. I didn't want to twist the whole floor. Apprently it's fine to pull back the chord in place

 

[Old tool guy]

Yep, should have measured the gap at the heel of the truss, and cut the blocking to match.

Are those 2x8’s on top of the bottom chord?

 

[ELCouz]

Yep, should have measured the gap at the heel of the truss, and cut the blocking to match.

Are those 2x8’s on top of the bottom chord?

2x4 + 2x6 (1.5x9) ... I had to chop all my 2x10 (1.5x9.25) blocking to 9" because of that.

 

[ELCouz]

Yep, should have measured the gap at the heel of the truss, and cut the blocking to match.

Well, shiii...... I'll redo all blocking, my fault, waste of wood on a 12x28 floor

 

[Hank11]

Well, shiii...... I'll redo all blocking, my fault, waste of wood on a 12x48 floor

Leave it alone.
You'll do more damage than good tearing that out.

 

[Garcky]

If you wanted more context see the picture ... I already did the blocking on edge for sheet end but being a total noob I am. I cut the blocking according to gap size. I didn't want to twist the whole floor. Apprently it's fine to pull back the chord in place

Just mark and snap chalk lines. Don't overthink.

 

[couch67]

you could strap the whole ceiling with 1x4's perpendicular to the trusses. Gives you lots of bearing for the drywall edges, and you can shim the strapping if you want a dead flat ceiling (it's a garage, I know! ).

 

[manwithtools]

you could strap the whole ceiling with 1x4's perpendicular to the trusses. Gives you lots of bearing for the drywall edges, and you can shim the strapping if you want a dead flat ceiling (it's a garage, I know! ).

How does that solve the OP's original problem of his 3/4" Flooring not landing evenly on the trusses?

 

[The Cobbler]

just an idea, 5/4 decking for the floor and then you can land the seams on a chord . maybe 12' or various lenght boards will give you less waste . or blocking too
and presumably you're going to have the same problem on the ceiling too

 

[Old tool guy]

How does that solve the OP's original problem of his 3/4" Flooring not landing evenly on the trusses?

Because the strapping is perpendicular to the trusses, and you carefully lay it out to align with plywood edges.

 

[manwithtools]

You still need to move the bottom cord to solve the flooring alignment, strapping solves nothing without fixing the cord center lines.

 

[Wolley]

If the spacing at the walls is correct, you should be putting the center of the trusses on layout. Bracing the trusses on layout would be nice too. You can start on a straight one and Mark the layout on your OSB then nail it down with the truss on the marks. Or slap some 2x4s on the sides would be fine too

 

[Old tool guy]

You still need to move the bottom cord to solve the flooring alignment,

No you don’t.

 

[Zeke]

If you're dealing with 1 inch here and there, just sister it with 2 x 4's and glue the T & G down.

 

[couch67]

How does that solve the OP's original problem of his 3/4" Flooring not landing evenly on the trusses?

It doesn't. Looks like I need to learn to read!