Purpose of this framing in attic?

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  #1  
Old 01-12-14, 02:10 PM
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Purpose of this framing in attic?

From within the attic, I observed this framing (of the main floor ceiling joists) & am curious what purpose it serves; the attached picture is a top-down view where the horizontal black rectanges are the 2x(6?) floor/ceiling joists and there are small 2x's nailed to each joist (red boxes). The joists only contact the exterior walls at the ends, & there are no walls underneath, except for right where the first short 2x is, a wall runs parallel to the joist. Anyone know what this pattern/framing is & why I would see this on one room out of the whole ((single-story) house?
 
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Old 01-12-14, 02:32 PM
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It's called blocking.
It's to help keep the rafters from twisting.
 
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Old 01-13-14, 04:33 AM
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Blocking

Blocking strengthens the structure by tying together adjacent joists. Often used on floor joists to reduce bounce.
 
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Old 01-13-14, 06:28 AM
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Thanks to the both of you...had a tough time trying to google this.
 
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