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Recent content by Greenalleycat

  1. Greenalleycat

    2 hour fire wall between townhouses

    Just design it to cantilever? Super easy for single story. Two story would be a bit niggly as you'd need midfloor support on the existing building side - may be tricky to attach. The post fire load here is only 0.5kPa though so they're pretty small loads
  2. Greenalleycat

    2 hour fire wall between townhouses

    Can you do it in masonry block? A 20 series block would easily provide that and could be built from one side while providing protection to both sides
  3. Greenalleycat

    Do you ever consider a '1 in 1 year return period' wind

    Ah yes, lawyers, the exact kind of client Ron was discussing... Our code sadly does not give "limits" - it gives "recommended limits" which means you can still be sued even if you meet them :) The plasterboard one is particularly baffling as it's based on H/300 testing data but, if you look at...
  4. Greenalleycat

    Do you ever consider a '1 in 1 year return period' wind

    Interesting, our Code racking limit is H/300 under a 1/25 year event - significantly more friendly than your limit I think this is too relaxed personally but that's the world we live in eh Our beam deflections are L/300 to L/500 depending on the particular case, but I don't think these work so...
  5. Greenalleycat

    Do you ever consider a '1 in 1 year return period' wind

    Yea basically that - the house is two story but roof over the ground floor extends outwards like a skirt to create some sort of inspired architectural design/expensive engineering headache I know what you mean about the $$ thing - it is so incredibly frustrating, especially in residential...
  6. Greenalleycat

    Do you ever consider a '1 in 1 year return period' wind

    This topic coming at you from some office musings In the residential world it's pretty common to get lovely things such as a house on the side of a hill facing an ocean These sites get the lovely combo of both higher wind loads due to the ocean/terrain combined with regular/reliable winds i.e...
  7. Greenalleycat

    Value in post-design inspection work?

    This question is amazing to me Here, you inspect basically everything you ever design, usually multiple times throughout the process On a high-end architectural house I could easily do 20 site inspections throughout the build As engineers we have a relatively high level of control over these...
  8. Greenalleycat

    One Drive - Am I the Last Person Using Dropbox for Business

    We use Dropbox for Business so definitely not the only ones I use Google Drive for my personal files / side hustle job files They are both great and shit in different ways, I don't think there's much reason to go either way I avoid OneDrive though as I have a theory that everything Microsoft...
  9. Greenalleycat

    Another how to fix it thread

    All we have to do is get them to build a fully air sealed subfloor Then we can assume that the air will behave like an incompressible fluid as it cannot escape and thus our shear capacity will go through the roof....
  10. Greenalleycat

    Another how to fix it thread

    You learn something new every day - this is why I visit this forum Going to start speccing structural air screws in my future designs
  11. Greenalleycat

    Darn Architects!

    Theoretically looks fine but seems like a sitation for a 4x4 instead? The 2x6 is going to look like shit in a year or two after some sun gets onto it And, as JAE said, second order effects will kick in as it moves with the sun - I can imagine you'll get significant sag in the beam above as the...
  12. Greenalleycat

    Another how to fix it thread

    I agree with Koot Also, laughing at the nice nailing from the floor that completely missed the joist at the top of the photo
  13. Greenalleycat

    Why are neutral axis different when checking ultimate moment and cracked inertia?

    Normally the serviceability condition (in my world anyway) would be done to check whether the concrete section cracks under daily loading The goal of this is to use the full concrete section properties for stiffness In this case, there is a triangular stress-strain distribution above and below...
  14. Greenalleycat

    Foundation Reinforcement

    A picture would tell a thousand words here. If you've got a crack travelling 3 storys down a brick building and into a foundation then I would be very very careful with getting involved and making sure you were certain of what was going on before speccing a repair Are you sure that the issue...
  15. Greenalleycat

    What Hanger to Use?

    That is a fun picture, thanks for sharing

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