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Old 09-09-2010, 10:36 PM   #16
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Adding Collar Ties to make a ceiling


Looks good other than one hanger too high on the center rafter above the dormer opening, but it will pass inspection.

Do you know the ridge is separating?

Notice in this article about the proper connection of ceiling/floor joists to rafters: http://www.finehomebuilding.com/how-...llar-ties.aspx

Make sure there is no short wall from the floor joists to the rafters: http://www.unified-eng.com/ch/thrust.html

Make sure the rafter/joist connection is well nailed: http://www.engineersedge.com/civil_e...onnections.htm

As you already had an Inspection by your local Building Department for the room over the garage at main house building and recently the dormer additions, why are you concerned with the ridge?

Gary

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Old 09-11-2010, 11:08 AM   #17
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Adding Collar Ties to make a ceiling


Hi Gary,

Thanks for the response. Yeah, I know the hangers are a little off. That's not my work, or else they wouldn't be off. They're plenty of other things off on those dormers also. The dormers were inspected already though anyway, and there were no issues.

Anyway, I started yesterday on the ceiling, and I'm about 2/3 done. I'm using all new 2x6's set at 9 1/2' (the height I believe of the first tie you see--as they were all off as much as half a foot), and I have them all at 16 OC. I've fastened them all with 10d nails, and I've tried to go as far in with the ties and nails as I could--I have about 6-8 nails on each side of the ties. I think it should be pretty strong, even without the bolts, etc. I may add a few screws here and there to help a bit. I'm counting the 16 OC helping a lot here--it seems like a lot of wood!

I got rid of the old ties, because they were fairly cracked here and there, and it didn't pay to try to keep them after I removed them (to reset the height).

The height is within the 1/3 from top. Not great for any spreading issues, but good for collar ties. The ceiling therefore is 3 feet above center, so that should be enough to avoid the extra dead load on the existing rafters.

As far as the short wall, I'm not really understanding what you mean. Do you mean the knee wall I have?

The reason why I have the concern for spreading would be more obvious if you saw how things on this house were constructed. Firstly, the birdsmouthes are too small (by a fair amount), and secondly there seems to be some spacing on the ridge to rafter connection. I can't tell if they messed up the cuts, which considering the way other things are built is very possible, or if there is indeed a little of a spreading issue. Perhaps the ridge is just set crookedly, I don't know.

I just wanted to stiffen things up a little. The way I have it now, it should help as far as collar ties goes, without effecting the rafters (being off centered as they are).

I might get some more strapping and add them to the existing rafter to top plate connection, if I can get in there with them.

Joe

Last edited by Joe1.; 09-11-2010 at 11:21 AM.
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Old 09-11-2010, 05:30 PM   #18
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Adding Collar Ties to make a ceiling


"As far as the short wall, I'm not really understanding what you mean. Do you mean the knee wall I have?" ----- No, the article was showing short wall failure because of missing rafter ties.

Remember to add an access for the new attic, if over 30sq.ft. and 30" high......

Gary
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Old 09-11-2010, 10:56 PM   #19
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Adding Collar Ties to make a ceiling


Hi Gary,

Okay, that's what you meant. Yeah, I have some access already to the new attic. The attic from the other roof section deads into it and I've broken out the sheetrock in that area in order to get the collar ties in place.

Anyway, everything else seem good to you? Maybe I'll get some pictures up of the framing before sheetrocking.

Thanks for the help.

Joe

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