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Recent content by PSUengineer1

  1. PSUengineer1

    Fasteners for wood lath and plaster ceiling

    awesome info. that 1922 code has exactly what I was looking for. i bought a hard copy on amazon. thanks!!!
  2. PSUengineer1

    fire damage to steel beam

    thanks in advance for reading. I typically refer to Raymond H.R. Tide, “Integrity of Structural Steel After Exposure to Fire”, Volume 35 No. 1: First Quarter (1998), pages 26 through 38. in looking at fire damage to structural steel. In my case I have no visual distortion/damage to steel...
  3. PSUengineer1

    Fasteners for wood lath and plaster ceiling

    i am trying to figure out why ceiling fell and have at least a modern-day code reference to back up my opinion. my opinion being that smooth shank nails were used to attach wood furring in lieu of ring shank. you know of a code reference i can use for attachment of wood lath to underside of wood...
  4. PSUengineer1

    Fasteners for wood lath and plaster ceiling

    I have an old building from 1908 with a wood lath and plaster ceiling. I suspect the ceiling fell down (only about 30 square feet of ceiling) due to smooth nails backing out over time. I have an older version of USG Gypsum Construction Handbook, but i don't see specific section regarding...
  5. PSUengineer1

    Metal Ceiling - partial collapse

    Thank you, ANE91. I have no reason to believe it is wind. Good observation on your point that the insulation is not disheveled. I definitely saw no signs of wind on outside of building. Trusses are 6 feet apart so I highly anticipate failure in nail withdrawal once I run the numbers. Thanks again!
  6. PSUengineer1

    Metal Ceiling - partial collapse

    Thank you for reading. I have an R-panel metal ceiling (3-foot wide sheets). The ceiling attaches to 2x4 wood nailers (laid flat). Nailers spaced every 30 inches and nailed to truss bottom chords with 2 to 3 10d nails. Trusses are at 6-foot centers. This is in a large storage faciltiy. No...
  7. PSUengineer1

    Vertical Streaks on CMU inside face

    Yes. it is a unit ventilator on the second-story above. I think that is what it is from. You think just condensation from the unit (i'm not an HVAC guy)? Thanks.
  8. PSUengineer1

    Vertical Streaks on CMU inside face

    In the attached photos is the north elevation of a 2-story school addition. CMU exterior walls. Steel floor/roof framing. Vertical stains are below a second-story joist bearing at north exterior wall (see dashed outline in Photograph 1). No streaks are below any of the roof framing members...
  9. PSUengineer1

    Fink Truss failure

    @dylansdad: yes, there are several others all behaving in the same way. Thank you.
  10. PSUengineer1

    Fink Truss failure

    Hello. I have a wood-framed fink truss. A rough sketch is attached. As you can see in the sketch, the top/bottom chord interface at the left hand side is not at a support. This is where failure occured, which I attached a photo of (note that a temporary wall is now in place below the failure...
  11. PSUengineer1

    criteria for localized floor deflection

    Hello Engineers. I have a 5-story condo building (no drawings, no site visit). I don't know what the floor framing is. Floor framing reportedly spans 24 feet. At the back side of one of the units I have a localized floor deflection of 1/2 inch over the last 4 feet from the sliding glass door...
  12. PSUengineer1

    identifying lime putty vs. portland cement mortar on a brick chimney

    Hello. When I see large deflections on chimneys rather than brittle failure, I start to think that the mortar is a lime putty mortar vs. portland cement mortar. Short of doing a vinegar test, or scraping to identify white inclusions vs. white aggregate, can you tell just by looking at the...
  13. PSUengineer1

    opposing rafters meeting at ridge board splice

    I have opposing 2x6s meeting at spliced 2x6 ridge board. Is there a code section (IRC) that references this detail, and if so, what code section is it? Should a vertical support be provided at ridge boards abutting? I attached one pic. Thanks...
  14. PSUengineer1

    horiz cracks near top of load-bearing CMU wall

    Hello. I have a warehouse wall about 18 feet high built in the 1960s. Don't know reinforcing, cell grouting, block width. I have horizontal cracks with lateral displacement between windows. I have a CMU cracked vertically with inward horizontal displacement. There is no unbalanced soil...
  15. PSUengineer1

    fractures at opposing wood rafters (near ridge)

    @dhengr: the rafters are 17-ft long on the slope.

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