Does anyone make 2 x 8 I-Joists?

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Bob Sisson - 26 Nov 2006 16:24 GMT

I want to build a "Room in a room" for my home theater, but the Ceiling
spans call for 2 x 8's at a minimum. I am hoping that someone makes a 2x8
I-joist as they will be MUCH lighter and easier to work with. I don't have
the ceiling (original) height to go much more than 2x8.

I know I could either hang a ceiling, or use the isolation clips, having
done that once I know I don't get the isolation I want... To keep movies
like Terminator-2 in the sound room and out of the living room above, I
really need to totally isolate the ceiling and floor above.

I can use 2x8x16's, but they are heavy and not always as straight as I would
like. A shallow I-joist alternative is what I really want.

Hope someone can help....

Bob Sisson

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marson - 26 Nov 2006 16:32 GMT

> I want to build a "Room in a room" for my home theater, but the Ceiling
> spans call for 2 x 8's at a minimum. I am hoping that someone makes a 2x8
[quoted text clipped - 12 lines]
>
> Bob Sisson

smallest I know of is 9 1/2". Am wondering why you need 2x8's, though.
according to the canadian wood council
(http://www.cwc.ca/design/tools/calcs/SpanCalc_2002/) you can span up
to 18' with a #2 spf 2x6. you could go and pick out straight ones.

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Bob Sisson - 26 Nov 2006 17:01 GMT

Probably because I mis-read the span tables...

I read that 2 x 6's could only do 12'... but that was probably with a higher
load than just drywall and insulation....

Bob

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DanG - 26 Nov 2006 17:23 GMT

I think you should strongly consider steel joists
like these: http://www.dietrichindustries.com/QueryIndexServer.asp
Though I can see no reason to clear span.

Run drywall ceiling grid, install unfaced insulation batts, attach
sound board, attach and finish drywall with one these methods:

drywall z furring
or drywall suspension systems like this:
javascript:viewResult('http://www.usg.com/USG_Marketing_Content/usg.com/web_files/Documents/System_Cata
logs/AC3152.pdf');
___________________________
Keep the whole world singing. . . .
DanG

>I want to build a "Room in a room" for my home theater, but the
>Ceiling spans call for 2 x 8's at a minimum. I am hoping that
[quoted text clipped - 15 lines]
>
> Bob Sisson

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Homeowner Forum / Construction / November 2006

Does anyone make 2 x 8 I-Joists?