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Old 03-17-2008, 12:35 PM   #1
Git
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Wood I-Joists


Hello

My house is five years old and is built using wood I-Joists, similar to the picture below. (They are actually a Boise Cascade BCI 450 joists and I believe the flange is 1.5" wide)

I wanted to hang some shelves and a storage device called a Racorpro Heavylift (see pic) from the ceiling in my garage.

The frame for the heavylift is approx 48" x 48" and is desinged to be bolted to ceiling joists that are 16" on center. My I-Joists appear to be 19.2" on center, so I planned on running two 60" long, 2x4's across three of the joists and then centering the frame on the 2x4.

How would I properly fasten the 2x4 to the bottom of these I-Joists? The ceiling is drywalled with 5/8" and I planned on cutting out little squares at the attachment points so I could properly locate the joist. They would later be covered by the 2x4.


Any help would be appreciated, thanks
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Wood I-Joists-i-joist-1.jpg   Wood I-Joists-racor.jpg  

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Old 03-18-2008, 10:55 AM   #2
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Wood I-Joists


Anyone?

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Old 03-18-2008, 05:42 PM   #3
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Wood I-Joists


Once you get the locations of the Joists, Fasten the 2x4's using 3" drywall screws in a predrilled holes. Apply some liquid nails prior to fastening for an extra hold.


-Daryl
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Old 03-18-2008, 06:23 PM   #4
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Spanning three joists is just fine.
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Old 03-18-2008, 08:57 PM   #5
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From what I've seen, most manufacturers won't let you cut or modify the flange at all. You might be better off furring out the web with blocking and securing your 2x4 framing to that.
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Old 03-18-2008, 09:29 PM   #6
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Wood I-Joists


Quote:
Originally Posted by ncgrogan View Post
From what I've seen, most manufacturers won't let you cut or modify the flange at all. You might be better off furring out the web with blocking and securing your 2x4 framing to that.
I think he is referring to cutting out little squares of the drywall, not any of the joist. Even rather than that, why not use a nail to locate both edges of the flange, then just measure? The line of nail holes will be covered by the 2 x 4.

Better than drywall screws, use some cabinet hanging screws with the large washer heads.
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Old 03-19-2008, 09:35 AM   #7
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Quote:
Originally Posted by troubleseeker View Post
Better than drywall screws, use some cabinet hanging screws with the large washer heads.
to cabinet screws

-Daryl
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Old 03-20-2008, 12:58 AM   #8
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I would'nt cut the rock that's your firebreak, especially to mount the 2x4 directly to the joist. If god forbid there was a fire you are creating a wick for the fire to spread up to the joist. I would screw the 2x4 right to the rock rather than compromise your fire rating. That type of storage device is pulling down on the mounting area, Not compressing the sheetrock.

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