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  1. L_Bey

    Upgrading Existing Building Joists?

    Very valid point - the 1.0DL would govern, so you'd need to check that for the 5% increase regardless. I pulled my text from chapter 5, since it's most general, but it's pretty much the same in the others. IEBC was the referenced code in Maine until April! But we're all up to 2021 in New...
  2. L_Bey

    Ponding Load

    My theory was that if I account for 2" of water due to the deflected shape, and then end up with a maximum total deflection of less than 2" under the DL + RL combination, I will have accounted for the progressive nature of ponding, and could ignore any additional analysis. I'm trying not to dump...
  3. L_Bey

    Ponding Load

    Thanks for the comprehensive reply! This thread languished for a bit and then I went on vacation, but I appreciate the insights. I'm in the North East, and for the most part we have internally drained roofs with two redundant internal drain systems separated by the code required 2" (and the...
  4. L_Bey

    Upgrading Existing Building Joists?

    Under the prescriptive method, the IEBC states for Existing Structural Elements Carrying Gravity Load (502.4): The Work Area Method has substantially similar language as well. You would need to evaluate the joists and joist girders at the area of the RTU (and any RTU caused snow drift) to see...
  5. L_Bey

    Ponding Load

    I am designing a building with minimum snow load (South Carolina) and am looking at the rain load requirements. I typically work in the north east where roof snow loads can easily be in the 50 psf+ range so rain loads typically aren't an issue. Looking at ASCE 7-16, rain load needs to be...
  6. L_Bey

    Force due to Lateral moment

    In general delegated design connections need to be stamped by an engineer licensed in the project jurisdiction if the connections have not been designed by the EOR. Are you doing the design of the connections? Based on the snip you provided it appears that the EOR is noting that the beam is...
  7. L_Bey

    IRC Townhouse Foundations

    We have seen a lot of townhouse construction lately, and have been having a mild disagreement in the office about how the foundations should be protected from frost. These are typical IRC townhouses, defined as [RB] TOWNHOUSE. A single-family dwelling unit constructed in a group of three or...
  8. L_Bey

    Wood Perforated Shear Wall

    The big benefit of perforated shear walls over segmented is that you can look at the entire wall, including openings. With a segmented shear wall each panel stands on it's own, meaning that the overturning/uplift calculation is for each panel alone. With a perforated wall you can run the...
  9. L_Bey

    Wood Perforated Shear Wall

    The perforated tie down requirement is a bit tricky, since it's the one thing that really differs from the standard wall framing. In my experience, typical sill anchors are generally OK for the uplift load at the base, though the spacing might need to be dropped depending on how heavy the...
  10. L_Bey

    Wood Stair Design

    Our typical process is to design the stringer as a beam, and note on the drawings what size LVL or dimension lumber it is to be cut from, and what the remaining depth required is once the treads have been cut out. We typically provide a hanger size for the top and bottom hanger, or a detail for...
  11. L_Bey

    IEBC 2018 Substantial Structural Alteration

    That makes sense - having the supported area add up to more than 100% doesn't really track. It also doesn't make sense that removing 1/3 of one of the bearing lines (when there are 4) would trigger a 30% threshold. The engineer originally looking at the project read the current code and assumed...
  12. L_Bey

    IEBC 2018 Substantial Structural Alteration

    I am working on a renovation to an existing building, and one section of the IEBC is causing a bit of disagreement within the office. The section in question reads as follows: [BS] SUBSTANTIAL STRUCTURAL ALTERATION. An alteration in which the gravity load-carrying structural elements altered...
  13. L_Bey

    IRC Townhouse Braced Wall Line Requirements

    Thanks Jason - That was my reading but it's good to have someone more familiar with that part of the code weigh in. Regarding the why don't we just do the engineering for the shear walls - generally that's where we end up, particularly for anything that's taller than 1 story (or 1 1/2)...
  14. L_Bey

    IRC Townhouse Braced Wall Line Requirements

    That's a really good point. That hasn't come up at the moment, but it's definitely something to keep in mind.
  15. L_Bey

    An new approach for design documentation

    We use Tedds for this in our office. Their out of the box calcs are pretty variable (and have been getting worse as they try to make them more advanced) but as a word add in it's super handy. Not as ugly as mathcad and handles variables really well.
  16. L_Bey

    IRC Townhouse Braced Wall Line Requirements

    We have been having a discussion in my office lately on the requirements for designing townhouses per the IRC. The main question is do we need to comply with the braced wall requirements per unit, or is the entire group of townhouses to be designed as a single structure. Often these structures...
  17. L_Bey

    Wood truss deflection over time

    Creep is a known concern with wood trusses, and the additional deflection over time can lead to higher than expected deflections than those reported by the design software. I am currently working on a building where there were some drywall cracks and the owner is concerned that the building is...
  18. L_Bey

    Spray foam insulation shear resistance

    Yeah, nothing is changing for this one - we can't even use the densglass, because the original building design was based on R=6.5 and incorporating densglass drops it to R=2. I was mostly curious because this isn't the first time I've had a contractor try to claim that spray foam would make...
  19. L_Bey

    Spray foam insulation shear resistance

    I have a project where they were supposed to install wood sheathing on a shear wall, and neglected to do so. The contractor is now trying to argue that the densglass sheathing and spray foam should provide some shear resistance, so they don't have to strip off the existing gyp and provide the...
  20. L_Bey

    FRT Structural Composite Lumber?

    I'm currently working on a project in Massachusetts where the contractor declared that they could not get composite lumber pressure treated, and if they did it would void the warranty. We ended up redesigning everything to remove any FRT composite lumber (including a truss as a header in an...

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