A quick search in my IRC 2009 and I found this. It has a revision line for this section, so it may not be in previous versions of the IRC. I starred the important part. Over 48" and not braced at the top puts you to sectionR404.1.3, Design required.
IRC 2009
R404.1.2.2.2 Concrete...
RFreund - what is the length of the wall?
Remember concrete can span along the length of the wall, not just the height.
For a crawlspace wall, no brace at the top from the main floor, no brace from a basement slab then the wall is supported at the corners. If this distance from corner to...
HA! I design repairs for these exact problems all the time. The engineers that keep ignoring this are nuts.
For residences with a hinge or better yet, lack of proper support by using the main floor to top of foundation will most likely fail. Or I should say will fail, just a matter of time...
I did a quick run using 2x8 @ 16"o.c.
loading of 40psf LL, 15psf DL
Hem fir #2
To me it works, it fails in negative moment at the center support when fully loaded, but that's not your issue. Your issue is positive moment and deflection of the 10ft span.
It works assuming only 7 1/4" depth of...
Got it. Just checking, it got me concerned. Here in Colorado we don't run into many situations that allows the bolts much over 48".
On another topic, I design production homes as well. I would be concerned that the crews would be able to get the spacing right if several different walls have...
AELLC
When you said
"the AB spacings are automatically calculated"
What did you mean? Calculated by what?
That really concerns me that you are questioning the 48" spacing as too conservative. There are of course many different situations, but if you consider soil pressure for a basement...
Having it posted on my website vs. knowing about the problem changes nothing. In fact I feel I'm helping to educate others, and I'm asking other engineers about the proper action.
Jim Houlette PE
Web: www.evstudio.us
Online Magazine: www.evstudio.info
I wanted to ask MANY questions, but felt the less I knew the better.
Is something like this required to be reported to the local building department? Falls into a gray area about if I know about the problem and if something should fail and hurt someone, could I somehow get dragged into the...
I was recently asked to provide engineering advice about a remodel under construction on a recently purchased house. I found too many problems and told the homeowner I can't get involved with it. The only recommendation was to speak with any engineer and/or the local building department...
Right, 3 1/2" wide. The floor truss at the exterior wall can still be 2x4 even with 2x6 studs above and below. With the short height, the 2x4s of the truss have a higher capacity.
With high loads bearing area tends to control. Squash blocks can then be used to increase bearing area at point...
It just depends on the loads you are supporting. Typically matching the stud spacing. Also, keep in mind spacing needed for any siding attachments.
Blocking and bracing for lateral forces is of course needed as well.
Jim Houlette PE
Web: www.evstudio.us
Online Magazine: www.evstudio.info
Be sure to check the sill plate condition. Very common for houses built roughly 20+ years ago to have long straight walls with nothing other than the main floor joists bracing the top of the foundation wall. Failure typically occurs at the sill plate splitting or the joists sliding on the sill...
The IBC has a simple formula.
Like Mike said - do it by hand. Don't blindly rely on a black box spread sheet!
Jim Houlette PE
Web: www.evstudio.us
Online Magazine: www.evstudio.info
Do not use gypsum.
I was happy with Dryjoist http://www.wahoodecks.com/dryjoist/
Otherwise, I typically, design for 4" concrete, corrugated steel deck, and steel beams.
I've also seen a lot of failing decks that have used less than 3" of concrete.
Jim Houlette PE
Web: www.evstudio.us...
