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  1. jdgengineer

    Retaining forces on residential footing stemwall in crawlspace

    When you have a relatively deep crawlspace below grade (say 42" tall, but not a true basement) how do you typically handle the retaining pressures on the stemwall? For basements in our area we typically design cantilevered retaining walls rather than rely on lateral support at the top of the...
  2. jdgengineer

    Seismic Loads on Site Walls

    I'm curious how others design site walls and retaining walls for seismic loading in seismic category D, E, F. Chapter 18 of the IBC requires seismic soil pressures for retaining walls >6' tall. Chapter 15 of ASCE 7 requires seismic loading on cantilevered site walls due to it's self-weight...
  3. jdgengineer

    Cantilevered Retaining Wall ACI 318-19 Hooked Bar Development

    I wanted to see how people are addressing the ACI 318-19 provision which no longer allows reductions in hooked development length based on excess steel. Two examples we commonly run across are on residential cantilevered retaining walls where forces can be somewhat significant, and with...
  4. jdgengineer

    Digital Building Codes Options

    Our office is looking at updating our building codes and reference documents for the upcoming California code cycle change on January 1st. In the past we have typically had hard copies of the building code, AISC, ACI, NDS, etc. However, our office has transitioned to a hybrid work option where...
  5. jdgengineer

    Shear flow built-up wood beam

    I'm looking to see if it is at all possible to deepen an existing ridge beam by adding another beam below and then gluing and screwing them together. I understand this is unusual for wood, and I haven't done it before, but just looking to see if it is feasible by calculation. The existing wood...
  6. jdgengineer

    Joto-Vent Below Wood Shearwalls

    Has anyone used a Joto-Vent continuous vent system below wood shearwalls in a high seismic area? They have ICC approval, but no mention of seismic loading in the report (just compression loading). They have seismic testing by a Canadian laboratory but the report states "Not to be used as an...
  7. jdgengineer

    Vertical Deflection Limits for Adhered Veneer

    What deflection limits do you all use for vertical deflection due to dead load + roof live load for adhered veneer attached to a wood frame structure? ACI 530 specifies L/600 for anchored veneer but I do not see a limit started for adhered veneer. I don't see it specified in the IBC either...
  8. jdgengineer

    Large Multi-Slide / Bi-folding Door Deflection Criteria

    On high-end residential projects it's fairly common to have large multi-slide (usually bottom supported) or bi-folding doors (usually top hung). Typical manufacturer's would be Nanawall, La Cantina, Fleetwood, etc. They all have slightly different design requirements, but generally speaking...
  9. jdgengineer

    Soil Nail Wall Partial Cut/Fill

    We are working on a residential project where the basement walls are proposed to be supported with soil nails. These will be designed by another engineer who is also doing the temporary shoring design so the soil nails will serve as both the temporary shoring and then have an embed plate cast...
  10. jdgengineer

    Bracing Existing Long Purlin Struts

    We are working on an existing residence which has a steep roof slope (7:12). The roof framing consists of 2x6 rafters that are braced at their midspan by 2x8 purlins which then have struts @ +/- 4'-0" oc. The existing struts that are in place are 2x6 and exceed 8'-0" in length due to the...
  11. jdgengineer

    Stone Veneer over Existing Stucco

    We have a potential project where someone is looking to add thin stone veneer over existing stucco on a wood framed single-family residence. The stone veneer is in limited areas around the exterior. Our main effort would be to determine if the additional weight of the stone veneer triggers...
  12. jdgengineer

    Elevated Residential Driveway

    Wondering if any of you have designed relatively small elevated driveways connecting the street to a residence on a steep slope. I am looking at a project that may involve constructing one of these and I'm not sure I have run across it before so I thought I would get some input. The bridge is...
  13. jdgengineer

    Buoyancy Mat Slab 1 Pour vs 2 Pours

    We are working on a high end residential project with a basement that due to the potential for a perched high water table the geotech has asked that we design the basement for a buoyant condition with water up to 3'-0" from the ground surface. To counteract the buoyancy we investigate retaining...
  14. jdgengineer

    Plywood Sheathing Horizontal Splice

    I have a project where we are running the exterior wall plywood vertically. The building is two story with a relatively tall first plate height. The contractor is trying to run a continuous panel from mudsill (below 1st floor joists) to 1st floor top plates but will be about 2" short. He'd like...
  15. jdgengineer

    Wood Posts on Concrete Topped Metal Deck

    We have a condition where we have wood framing built on top of a concrete topped composite metal deck (2.5" topping over w2 deck). We have conditions where we have 6x6 posts within 2x studwalls that sit on top of the metal deck. We have steel beams located directly below the posts and below the...
  16. jdgengineer

    Attaching C.R. Laurence Aluminum Channel to Slab / Metal Studs

    We are working on a small project with C.R. Laurence interior glass partition walls. The walls are roughly 8'-0" tall and attach to a slab on grade at the base and to metal stud ceiling joists at the top. How are these shoes commonly attached? It's my understanding that they are aluminium, so...
  17. jdgengineer

    HSS Knife Plate Shear Tab Lateral Stability

    When you have an HSS column with a knife plate acting as a shear tab with beams framing into two parallel sides, has anyone tried to justify this connection providing lateral stability to the column in the out-of-plane direction of the knife plate? I'm assuming it wouldn't meet the AISC...
  18. jdgengineer

    Continuous Beam over Column - Lateral Bracing

    I know versions of this question have been asked on here in the past, but I thought I would post again for clarity. When you have a steel wide flange beam running continuously over the top of an HSS beam do you put in only web-stiffeners and design the stiffener as a "continuation" of the...
  19. jdgengineer

    Steel Mono Stringer w/Steel Treads

    I think there have been similar discussions in the past, but I didn't see the exact answer to my question. We are working on a stair for a single family residence. The stair will be a central mono stringer with steel treads wrapped in wood. The tread build up will be a steel plate with 1 1/8"...
  20. jdgengineer

    Wood shearwall not extending to roof with windows above

    I'm working on a wood framed project which has several exterior walls where the solid wall does not extend all the way to the roof. Above the wall there are clerestory windows with structural posts between each window. See below for a photo I found on the internet. Not the exact situation but...

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