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  1. Forensic74

    Miami Beach, Champlain Towers South apartment building collapse, Part 02

    Lol, run GPR on this building? I've gotten quotes over 40 grand just for the GPR and they couldn't decipher anything useful. Its not all that its cracked up to be.
  2. Forensic74

    Miami Beach, Champlain Towers South apartment building collapse, Part 02

    I see a lot of ideas swirling around here, but suggest some of you read up on plaza drainage systems. I see so many plaza drainage system failures due to poor architectural design and/or implementation. This leads to a lot of concrete damage that works it way from the concealed surfaces outward...
  3. Forensic74

    Liability of Changing Residential Site Drainage

    On what basis? Standard/code or legal statute? Or are you giving a gut response?
  4. Forensic74

    Code Requirements of Exterior Hardescape Stairs

    So the international building codes obviously have a plethora of requirements for stairways, but these codes are specifically written for stairways within a structure, not outside of a structure. It seems like like stairways outside of a structure are somewhat ungoverned. Outside of ADA...
  5. Forensic74

    Liability of Changing Residential Site Drainage

    On your typical 0.25 acre suburban single family housing properties, do any of you have a feel for the standard of care when one homeowner makes a change to the surface water flow in how it might affects a neighboring property? Is this codified or standardized anywhere or is it more of a state...
  6. Forensic74

    Deicer Trucks on Parking Garages

    PCI has a publication "Parking Structures Recommended Practice for Design and Construction" that talks about loadings, but gives zilch in the way of loadings from winter maintenance. ASCE published a study "Design Live Loads for Parking Garages" and it ignores any case over a normal passenger...
  7. Forensic74

    Deicer Trucks on Parking Garages

    Again, so it would appear that there is a disconnect between the 40/50 psf in the code (limits you to about GVWR of 7000 lbs) and what any normal winter maintenance truck would be. So for those of you designing parking structures in cold climates, you're telling owners that they're limited to...
  8. Forensic74

    Deicer Trucks on Parking Garages

    hmm, GVWR of a F350 loaded with salt can be on the order of 14,000 lbs......spread over a 9'x16' is 100psf with wheel loads of up to 5000 lbs. How is this even close to the 50 psf in the code?
  9. Forensic74

    Deicer Trucks on Parking Garages

    Does anyone have any good references that talk about proper winter maintenance practices on parking garages? Specifically regarding how to address the weight of deicer/plow trucks? I find that the weight of deicer trucks will typically exceed code loading, and I am curious as to how the code...
  10. Forensic74

    Inspection of Roof Framing

    I would first consult with an engineer familiar with corrosive environments, or do reasonable research, to determine how much hidden issues can exist. If there's not too much potential for hidden damage, I'd probably move forward. This is a niche issue so, it could be an engineer or inspector...
  11. Forensic74

    Scanning Large Format Plans

    Due to COVID, a lot of print/scanner shops are shut down. Does anyone know of any alternatives to just taking photos of plan sheets? I would have thought by now there would be some good apps or scanner wands that could handle scanning full size construction sheets, but I'm not seeing anything...
  12. Forensic74

    I’m closing a small engineering bus

    I have been on quite a few cases now where the engineer or architect made a boo boo and is no longer in business...... there never seems to be a desire to go after them, but rather go after anyone else involved in the project who still is operating. Actually, having tail coverage may make you a...
  13. Forensic74

    Groundwater Induced Basement Wall Failures - Defining Hydrostatic Failure

    My bad, yea you're right. "Can the infiltration of groundwater into soil induce at-rest soil pressure?" Does anyone know offhand if the IRC tables are based on active pressures?
  14. Forensic74

    Groundwater Induced Basement Wall Failures - Defining Hydrostatic Failure

    I think my question is pretty simple. Can the infiltration of groundwater into soil induce active soil pressure? I've never seen this in any references, and I think most just overgeneralize the term hydrostatic pressure. I generally see about 6 full failures per year. Have seen more this...
  15. Forensic74

    Groundwater Induced Basement Wall Failures - Defining Hydrostatic Failure

    When I say failed, I mean the homeowner suddenly got a new walk-out basement. Red tagged structure, $60k+ to reconstruct. Side note, it is amazing how much bridging action there is in the first level wall framing when you see 40' of basement wall completely gone. Sometimes, I can see when the...
  16. Forensic74

    Groundwater Induced Basement Wall Failures - Defining Hydrostatic Failure

    One other thing is that CMU walls are notoriously leaky. Cant imagine how these pressures are developing when the walls are usually already cracked and leak like sieves.
  17. Forensic74

    Groundwater Induced Basement Wall Failures - Defining Hydrostatic Failure

    Since it hasn't stopped raining for the past year on the east coast, I have been seeing a slew of CMU basement wall failures. I see a lot of engineers chalk up these types of failures to "hydrostatic pressure" induced from "the pressure of the water column acting on the face of the wall"...
  18. Forensic74

    Flat Roof Perimeter Nailer Anchorage Design

    Forgot to note, the NRCA standard specifically says that the the configuration of the perimeter nailer and its anchorage is the responsibility of the designer. "A designer should specify the means of attachment, as well as the fastening schedule for all wood nailers and blocking."
  19. Forensic74

    Flat Roof Perimeter Nailer Anchorage Design

    I'm curious then, who exactly do you think is performing a load/strength analysis of the edge nailer, the contractor?
  20. Forensic74

    Flat Roof Perimeter Nailer Anchorage Design

    Yes, I've been the SEOR and understand where you're coming from. That said, there are engineers out there who detail this nailer, and I think that's the appropriate way to go as it's the design team's responsibility and the SEOR has the CC edge and corner zone loadings on hand.

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