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  1. jhoulette

    Knee wall - foundation wall 'hinge'

    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...
  2. jhoulette

    Knee wall - foundation wall 'hinge'

    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...
  3. jhoulette

    Knee wall - foundation wall 'hinge'

    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...
  4. jhoulette

    Notch in floor Joist

    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...
  5. jhoulette

    AB spacing at exterior shear wall

    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...
  6. jhoulette

    AB spacing at exterior shear wall

    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...
  7. jhoulette

    What do you do when it can't be fixed?

    Thank you for everyone's advice. Jim Houlette PE Web: www.evstudio.us Online Magazine: www.evstudio.info
  8. jhoulette

    What do you do when it can't be fixed?

    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
  9. jhoulette

    What do you do when it can't be fixed?

    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...
  10. jhoulette

    What do you do when it can't be fixed?

    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...
  11. jhoulette

    Continuous Bearing Truss ( Floor)

    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...
  12. jhoulette

    Continuous Bearing Truss ( Floor)

    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
  13. jhoulette

    Foundation wall repair

    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...
  14. jhoulette

    Light pole foundation

    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
  15. jhoulette

    Exterior Deck Construction

    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...
  16. jhoulette

    Rigid or Flexible Drilled Pier?

    oops - should say "it is assumed that all lateral forces"
  17. jhoulette

    Rigid or Flexible Drilled Pier?

    Don't get me wrong, I understand that the lateral forces will transfer to the piers and that's how I design them for large projects. However, in the residential world (a scary world ;o) it is assumed that no all lateral forces are transferred through the foundation walls to the soil, no lateral...
  18. jhoulette

    Stffened slabs adequate for uplift?

    How would a pre-engineered metal building be any different than other buildings? Same principals are there, maybe some buildings have more bearing walls in lieu of columns, but the uplift concentrations are still there. I guess PEMB might be lighter than the typical building... Jim Houlette...
  19. jhoulette

    post-tensioned slabs on expansive soils ym

    ym can vary a lot. But to help you out I generally see ym center between .5 to 1.75" ym edge between .9 to 2.5" I design PT slabs in CO and TX and yes there is a difference between the two areas. Even a major difference it seems between the geotechnical engineers and the way they prefer to...
  20. jhoulette

    Magnum Board Foundation

    Hello, Has anyone used Magnum Board AKA Magnesium board? I'm curious about a few things: How it's shear values compare to 7/16" OSB at the same nailing? Also, if anyone has used it in contact to soil? Thank you, Jim Houlette PE Web: www.evstudio.us Online Magazine: www.evstudio.info

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