WOOD KING STUD
WOOD KING STUD
(OP)
I'VE GOT A 20'-0" HIGH WALL ON A PROJECT THAT HAS AN 8'-0" WIDE OPENING. BASED ON 20 PSF WIND LOAD THE KING STUDS WOULD HAVE A DISTRIBUTED LOAD OF 80 LB/FT AND NEED TO BE (4) 2X8'S. THE CONTRACTORS SAY THIS IS EXCESSIVE AND IT DOES SEEM TO BE, BUT I CAN'T WORK THE NUMBERS OUT ANY OTHER WAY. IS THERE ANYTHING I'M MISSING,DOES THE WINDOW FRAME ITSELF TRANSFER SOME OF THE LOAD?
THANKS,
THANKS,






RE: WOOD KING STUD
I have seen drywall cracking problems due to wind loads on tall walls where the strength was OK, but the deflection caused the cracking. Extra openings caused points for the cracks to begin. Especially important if you are situated where you can get wind gusts that can cause momentary deflections.
Dick
RE: WOOD KING STUD
if the opening is 8' what is the spacing to the next vertical member if its 16" then the kin g is carrying 1/2 x (8+1.33) and therefore greater than the 80psf. What grade and species is the lumber? I think you are too conservative.
RE: WOOD KING STUD
The problem is, you'll have to do that for every window instead of once for every 8-foot window. In the end, it is what it is.
RE: WOOD KING STUD
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RE: WOOD KING STUD
RE: WOOD KING STUD
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RE: WOOD KING STUD
RE: WOOD KING STUD
RE: WOOD KING STUD
DaveAtkins
RE: WOOD KING STUD
Also, are you using the component and cladding pressure? You should be. Typically, I have to design for 110mph exposure C (3 sec gust, IRC) which depending on geometry and building height usually gives me close to 30psf wind load. I hope this helps.
RE: WOOD KING STUD
RE: WOOD KING STUD
RE: WOOD KING STUD
With a 20' high wall, you have 2x8@16?... A 4' trib width of wall loading would require 3 studs plus the one in the wall...
I don't think that 4 is unreasonable or over conservative...
Dik
RE: WOOD KING STUD
RE: WOOD KING STUD
I have found that the easiest way to explain it to them is as follows (tailored to your situation:
"Assume the wall is an attic floor, with a 20' span and a 20 psf live load. What joist size would you use? Now, create an opening through the floor for a stairway. What would your trimmers be?"
This puts the situation in a perspective that can be understood. I cannot think of anyone that could honestly say less than 2"x10"s for the floor joists and at least two, or three 2"x10"s for the trimmers.
RE: WOOD KING STUD
But always remember that when it comes to sizing members in unusual situations - they have no idea what they are talking about! The builder in question probably hasnt done a wall this high and is comparing it to the usual 10' high openings.
RE: WOOD KING STUD