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Old 04-09-2010, 07:39 PM   #1
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Is permissible per manufacturer to cut the center out of a tgi ?


Is permissible per manufacturer to cut the center out of a tgi for enough room to install flex duct when the floor vent is against an outside wall. There seems to be no other alternative.

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Old 04-09-2010, 08:25 PM   #2
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Is permissible per manufacturer to cut the center out of a tgi ?


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Originally Posted by bcbearhnt View Post
Is permissible per manufacturer to cut the center out of a tgi for enough room to install flex duct when the floor vent is against an outside wall. There seems to be no other alternative.
Depends on the size of the joist and how much you're cutting. General rule, not 2" from the top or bottom and 33% of the total width of the joist.

Other words, you have a 12" joist, Max 4" cut and not the top 2" or bottom 2".

BTW, It's TJI not TGI.

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Old 04-09-2010, 10:09 PM   #3
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Is permissible per manufacturer to cut the center out of a tgi ?


http://www.ilevel.com/literature/TJ-4000.pdf

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Old 04-09-2010, 10:13 PM   #4
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Is permissible per manufacturer to cut the center out of a tgi ?


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Originally Posted by Nostco View Post
Depends on the size of the joist and how much you're cutting. General rule, not 2" from the top or bottom and 33% of the total width of the joist.
Other words, you have a 12" joist, Max 4" cut and not the top 2" or bottom 2".
BTW, It's TJI not TGI.

Those numbers sound more like dimension lumber that TJI's. Unless guidelines have changed, you could cut the web out to within 1/4" of the flanges; absolutely do not overcut and scar the flanges. I'm not quite clear on your description of the situation, but if the cuts are close to the ends of the joist where they bear on a wall, you are in the area that is most restricted. Engineered joists are opposite of dimension lumber in this
respect..you have more freedom when you get away from the bearing points, unlike dimension lumber, where you try to keep penetrations close to te bearing points whenever possible.

ALWAYS CHECK THE FACTORY INSTALLATION GUIDE SPECIFIC TO THE MANUFACTURER OF YOUR PRODUCT, YOU DON'T WANT TO VOID THE WARRANTY OVER A SIMPLE ERROR.
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Old 04-10-2010, 02:17 AM   #5
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Is permissible per manufacturer to cut the center out of a tgi ?


If not implied in what Nosco posted, there are also limits on how much of the web you can destroy along the length. Certain sized holes need to be X inches apart, etc. The lumber company should have the specs on their particular BCI, TJI, or whatever brand you have.
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Old 04-10-2010, 08:43 AM   #6
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Is permissible per manufacturer to cut the center out of a tgi ?


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Originally Posted by bcbearhnt View Post
Is permissible per manufacturer to cut the center out of a tgi for enough room to install flex duct when the floor vent is against an outside wall. There seems to be no other alternative.
You HAVE to follow the I-joist manufacture installation guide that GBR posted a link too. That's the only way to do it.

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