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Old 03-13-2012, 08:35 AM   #1
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cross member in attic...


Hello,
Had a question about a 2x4 running at 90 degrees across my attic joists. The picture I've attached below isn't great, but you can see a 2x4 laying flat running across the joists. (which are only 2x4's).

My problem is, I'm installing a bathroom fan, and need to run the 4" pipe (closer to 6" because it's insulated), parallel to the joists for 2-3 feet before turning up towards my exit point. It needs to run right through where that flat 2x4 is.

I was wondering if it is structural at all? Essentially can I cut it? I would add additional 2x4's running flat in a more convenient area across say 3 or 4 joists where I cut it. I only need to cut it between 2 joists. It doesn't look structural to me, other than possibly to tie the joists together, or prevent twisting, etc...? In that case, I would think adding additional support and removing it there would be ok?

Any thoughts? Appreciate the help.
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Old 03-13-2012, 08:47 AM   #2
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cross member in attic...


Clearer pictures would help!
It does look like "stiff-backing" or "ties".
However, post some more pictures! Please!

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Old 03-13-2012, 10:02 AM   #3
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cross member in attic...


it is and is not structural. It there to be a cross brace for the trusses You can move it and place it else were. It's there to supply lateral support i.e. side to side. If you removed it placed it six inches either way. It won't be a problem. because you have your roof tied in your other trusses secured. So I would just move it were you need it and nail it back down.
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Old 03-13-2012, 10:33 AM   #4
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cross member in attic...


You're probably going to have to cut some of it out -
Before you do that, you should probably do what "Nailbags" suggests -
Add something to replace it (before you cut whatever you have to) -
Then cut it.
Do not cut ANY of your 2 X 4 "joists"!
They're "trusses"!

"RF"
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Old 03-14-2012, 05:46 AM   #5
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cross member in attic...


Thanks for the advice!

I'll try to get a better picture one night this week.
I definitely won't be cutting any trusses!

Question though, if only need to cut out the portion between two trusses... so 24" or so (they are on 24's..), do I need to add or move the whole length of that tie in? (I'm not sure how long it is, as it's covered by insulation, I only have a bit exposed.

Can I just add a length that goes across 4 or 5 trusses, like 2 or 3 on either side of the part I plan on cutting out? Would that be sufficient, or is it better to do the whole length?
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Old 03-14-2012, 06:02 AM   #6
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cross member in attic...


Just go a few truss chords in either direction

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