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Old 08-25-2018, 02:31 PM   #1
Tool Guy - Kg
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Skylight rough opening width dimension?

I’ve been looking at skylights for a house with 24” O.C. roof trusses.

And I am puzzled at the manufacturer’s offerings that include both a 21.5” and 22.5” rough opening width measurement. If you’ve got 24” O.C. trusses, for example, you’d have a maximum rough opening width of 22.5”. Why do the companies offer a 21.5” width, as well? I’m missing the reason for this narrower width.
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Old 08-25-2018, 02:41 PM   #2
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3x trusses? Or I-joists with 3x flanges?

Cheers, Wayne
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Old 08-25-2018, 05:27 PM   #3
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In case the framers were hungover from the night before.
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Old 08-26-2018, 08:17 AM   #4
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If they offered only the 21 1/2" size, Goldstein, I'd be inclined to go with Kevin's thinking that it would be to accommodate poorly placed framing members, but if they also offer a 22 1/2" size, I'd hafta discount that thinking somewhat.

Can't go with Wayne's thinking on accounta with a 3x member you'd need a 21" unit or a 20 1/2" if the 3x was nominal. Perhaps you're in an area where full 2" engineered members are common for roof rafters? Either LVLs or I-Joist type? Be a PITA to finish out if they used the I-Joists, though.

Bottom line? I dunno.
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Old 08-26-2018, 08:25 AM   #5
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Quote:
Originally Posted by CX
Can't go with Wayne's thinking on accounta with a 3x member you'd need a 21" unit or a 20 1/2" if the 3x was nominal.
The OP referred to rough opening width, not frame size. And a 21.5" RO width is what you'd get with nominal 3x framing at 24" o.c.

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Old 08-26-2018, 09:20 AM   #6
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Yeah, 21 1/2" is what I meant, Wayne. Old fingers mistake is what I'll claim.
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Old 08-27-2018, 07:59 PM   #7
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I need to make a correction. The smaller rough opening width is 21".

Around these parts, everything I've seen in residential is either nominal 2x roof trusses or 2x rafters.

Being a weekday, the company was open and I talked to tech support. And their response was, "The 21" width has been a traditional width for more than 70 years'.

Thanks, all.
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Old 08-27-2018, 09:01 PM   #8
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Quote:
Originally Posted by Goldstein
"The 21" width has been a traditional width for more than 70 years'.
Mmmm, that must be Wisconsonian for "I dunno."
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Old 08-28-2018, 11:43 AM   #9
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The tradition might go back to when 2x4s were actually two by four inches, and some were a little more. A 21 inch skylight would allow for a little slop.
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Old 09-09-2018, 01:43 PM   #10
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may have to do with the way 1/2" drywall finishes up under the skylite.
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