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Wuzzat? · 02-10-2010, 08:47 AM

If you can leave 3.2" instead of 3.0" the strength is the same, so you then remove 2.3" [instead of 2.5"] from each 2x6 [of which the exact dims are 1.5" x 5.5"].

It seems like these high value exponents make the final result very sensitive to the dimensions.
This also tells me why I get different values than some tables. If you round off 3.2" to 3" you get different final answers.
This precision is necessary only for the span value and the moment value.

swindmill · 02-24-2010, 06:44 AM

I've got the opening finished and the door in place.

Would it be wise, or add any support, if I doubled up on the jack studs?

Wuzzat? · 02-24-2010, 03:25 PM

"When framing door openings, it is desirable [?] to double the studs"
from
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Carpentry - Google Books

Carpentry & Building Construction: A ... - Google Books

swindmill · 02-27-2010, 09:41 AM

I wasn't sure in this situation because of the unique circumstances. The original opening has king and jack studs, but because I just made that opening smaller, I wasn't sure if there was any reason to put two jack studs where I brought it in on the one side. I suppose there's no reason not to.

Bud Cline · 02-27-2010, 10:09 AM

DO IT! Over time and with use, the hinges and the strike will cause undo vibration in those studs and eventually loosen the wallboard around the nails that hold it in place. Stiffen it up a little with double studs as it should be.

swindmill · 02-27-2010, 10:11 AM

I hadn't thought about the vibration on that one stud...that would be an issue. I'll put another stud up before I drywall it today.

Bud Cline · 02-27-2010, 10:15 AM

Under these circumstances I would even think about turning that extra stud 180 degrees to further stiffen the first stud. Don't think the hinge side won't move over time because it will but probably not as much as the "strike" side.

swindmill · 02-27-2010, 10:27 AM

Do you mean a quarter turn...to form a T, rather than side by side?

Wuzzat? · 02-27-2010, 10:29 AM

Quote:

Originally Posted by Bud Cline

Under these circumstances I would even think about turning that extra stud 180 degrees to further stiffen the first stud.

Literally, you're right. It'd be ~6x stiffer, but I don't think anyone does this. Maybe other considerations take precedence.

Bud Cline · 02-27-2010, 10:37 AM

Quote:

Do you mean a quarter turn...to form a T, rather than side by side?

Yes, basically!

I agree it isn't normally done, but hey, why not? Anyway, either way, stiffen both of those studs, hinge and strike side.

It probably isn't done because it would give you less "meat" to attach the casing to. Casing will typically be around 2 inches wide and sometimes a fastener is desired about 1-1/4" from the edge as well as close to the jamb. Doubling the studs in the traditional manner would provide the needed meat to nail to.