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  1. karimom

    Building Analysis - Effective R Value

    Hi All, I'm looking for some guidance. I've been asked by the building department locally to do an analysis of an existing building for energy efficiency. Essentially, the walls are missing an effective R value of R3 and we are proposing to add insulation to the roof to maintain the overall...
  2. karimom

    Spread footing above Sewer/Sanitary Pipe

    Hi, I have a project where I had a small spread footing for a mezzanine. During scanning/reviewing the existing conditions, we found a PVC storm pipe 3' below (its around 12" in diameter). I was just wondering the best practices on handling this from a design standpoint that isn't going to...
  3. karimom

    Tension in Roof Collar Tie

    Wall to wall
  4. karimom

    Tension in Roof Collar Tie

    Hi All, I am doing a repair for a roof and the span is quite long for a stick framed roof (42' w/ rafters at 16"o/c). I used the method of joints to determine I need ceiling joists to resist 14.42KN ~3.3kips. Is there a better way of connecting them then using 30 some nails such as an off the...
  5. karimom

    Residential Roof Nailing Roof

    Please remember that we are in northern canada, our snow loads are 40 psf. This is for an existing structure. 30 nails doesn't sound right, which is the reason for the comparison to the code.
  6. karimom

    Residential Roof Nailing Roof

    No ridge beam, only rafters together with a ridge board
  7. karimom

    Residential Roof Nailing Roof

    We are having some debates at the office regarding the roof rafter and ceiling joist nailing and would like some outside advise. Essentially, we have a 35' wide house framed to a 1:3 pitch. When calculating the tension reactions through the ceiling joists/ties to prevent wall thrust, we are...
  8. karimom

    Residential Slab on Grade Footing

    See attached from another post I seen on neg-tips. However, even on that thread they didn't solve this definitely. https://files.engineering.com/getfile.aspx?folder=086ef9bb-a98b-4aae-9acb-ecfe2c65919c&file=image003.png
  9. karimom

    Residential Slab on Grade Footing

    This is a 5"SOG, the failure is based on e<l/6 and exceeding allowable stress at peak demand. I've also seen L-shaped footings where eccentricity was ignore pending that the stirrup legs into the slab could resist the moment.
  10. karimom

    Residential Slab on Grade Footing

    Any thoughts on this one anyone?
  11. karimom

    Residential Slab on Grade Footing

    See attachedhttps://files.engineering.com/getfile.aspx?folder=ad007007-9da0-4b41-b6e1-f6ce2d0d7b80&file=footing.png
  12. karimom

    Residential Slab on Grade Footing

    We've been having discussions at the office and we're looking to solve this once and for all. We have a residential footing here in Canada for a house that will see roughly a line load of 30KN/m2 the soil is around 100KPa. Based on this design, one engineers believes that we still need to...
  13. karimom

    Pouring concrete on rebar

    I have a project where the contractor chipped out the concrete around the rebar of a lintel (door way for a bathroom). They realized it wasn't in the right spot and repoured the lintel on top of the existing rebar. The architect wants an engineer to review what happened and provide assistance on...
  14. karimom

    Geotechnical report interp

    I got a geotech. report with a factored ULS of 2ksf and a geotech. resistance factor of 0.5 . For my model, I would be using the ultimate allowable as 4ksf with a factor of safety of 2 based on ASD correct?
  15. karimom

    Location of connection under combined shear and axial load

    Yes, you will need to consider the additional eccentricity and weld capacity reduction. I'm not sure where you are in terms of relevant codes. It would be easier to provide guidance if you had a sketch.
  16. karimom

    Monolithic/Slab on Grade

    Ok - so even with eccentricity of ~6" I can just check the footing for bearing pressures assuming uniform distribution? How is it handled in the case of a point load? Same case over a 1m strip?
  17. karimom

    Monolithic/Slab on Grade

    I am working on a project where the geotechnical report specified that a monolithic slab is a required with thickened edge (see attached photo). The line load will be on the exterior of the footing and will apply some eccentricity to it. I would assume from common sense that it would not...
  18. karimom

    Wood Laminated Roof Deck Cracking

    Do you have any explanation for the crack as well? I'm still stumped on why it could have cracked? If it was due to overloading, the other members beside it would have also cracked. The crack (main one, not the one I believe is from shrinkage) is 2' from the support. The total span is 11'. I...
  19. karimom

    Wood Laminated Roof Deck Cracking

    They are 2x4's laminated beside 2x3's. Since the grade is unknown it makes it difficult to determine if they are adequate. Assuming northern pine (weakest grade), the adjacent 2x3's should be able to take the load. Also, since the break is close to the edge, the amount of bending on it is less...
  20. karimom

    Wood Laminated Roof Deck Cracking

    Hello, I am new here but hit a bit of a wall when working on this laminated roof deck. The deck is made up of a series of 2x4 and 2x4 wood laminated together using nails. We were called in to investigate some cracking in the wood. I've attached some images. I ran the calc and it seems that...

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