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Old 06-27-2009, 06:41 AM   #16
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Balloon Framing


Interesting posts.

The IBC says you need to have a "rafter tie"
to keep the rafters from spreading. This is not a collar tie!

If the rafter ties (which are normally ceiling joists, or floor joists if there is an attic) are above the wall plate, the code has some guidance about the amount of nails required to help contain the thrust. Just raising the ceiling joists a foot or two increase the thrust on these members so much about 10 nails are required to hold them. (don't quote me on the number of nails, see the code or do a calc for the thrust) I have used bolts because the number of nails required will turn the rafters into swiss cheese.

The days of doing dormers by replacing ceiling joists with collar ties are over! Collar ties do practically nothing for thrust.! Colllar ties only hold together the ridge in case of a wind storm.

The author of the thread is correct about hinging action.
it is something to worry about.

Notch the ledger into the studs. However i have seen it nailed in books.

http://www.westchester-architects.com

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Old 06-27-2009, 07:28 AM   #17
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Balloon Framing


first off, I didnt go into detail on how the roof was framed and secondly, if youre an engineer, I cant argue with you but from what I understand with a cathederal ceiling you need a load bearing ridge, in the case mentioned before, the ridge was a 3X14 engineered beam. The rafters were 2X10 @ 12" O.C. The cieling joists had a 2X10 strongback and every third one was bolted through the roof rafter. The framing passed inspection.

The subject was balloon framing . . .
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Old 06-27-2009, 03:42 PM   #18
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Try not to balloon frame, but if you must FIREBLOCK between the floors and DO notch in the ledger.
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Old 06-27-2009, 10:04 PM   #19
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Most of the old balloon framing was done with a 1x4 notched into the studs. The floor joists were then placed on top of the 1x4. Most of the reason balloon framing is not done anymore is because of the extra labor and the difficulty of raising up tall walls. Make sure to get it all engineered.

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