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  1. RWW0002

    good reference for alterations of existing reinf. CMU walls?

    Regarding lateral - If in line with other masonry shier walls (presumably) - How would an OMF ever pick up any lateral load? As Greenalleycat alludes to above, the shear walls are going to be orders of magnitude stiffer than the moment frame, and load will distribute to the lateral system(s)...
  2. RWW0002

    Beam Reinforcement Calculation

    BA - I think there may be some confusion about the Q term here. The way I see it the areas you show in the photo for the Q term would be correct if the assembly was made up of (2) WT sections (in black) welded to a very thick plate (thickness of web + 2 side plates) - shown in blue in your...
  3. RWW0002

    Beam Reinforcement Calculation

    I also agree but might add that lateral bracing of the plate members by the existing section should be considered as well.
  4. RWW0002

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    I am not following the math here. Can you give me an example of how 5% increases in loads can lead to a load combination of anything over 5%?? My opinion is that the letter of the "new" wording is more restrictive and more conservative than previously. It seems that you are implying that it is...
  5. RWW0002

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    To me the "new" wording seems more restrictive, and I agree that it may be by mistake, but it is hard to know. Consider a case similar to one posted on here a while back where solar panels were imparting an increase in snow load to a portion of a concrete roof. (In that specific case wind load...
  6. RWW0002

    Legal Thoughts on Stamping Plans

    There are some states and counties with specific cases in which stamped design is required. Rental units over x sq feet and houses over 5,000 sq. feet are ones I have come across from time to time. My understanding is that they are wanting fully engineered plan sets for these cases, ether via...
  7. RWW0002

    Legal Thoughts on Stamping Plans

    Outside of the engineering practice rules/lasw/ethics, there are likely some copyright issues with stamping someone else's work (if done without their consent/knowledge).. I am not aware of a reason or requirement to stamp house plans in TN.
  8. RWW0002

    Legal Thoughts on Stamping Plans

    This (or similar topics) have been discussed on here many times. Rules vary from state to state and opinions/interpretations of state rules varies among forum participants. You might find some good information if you use the forum search tools, but ultimately you should read and understand the...
  9. RWW0002

    Stacked Stone/Rubble Foundation

    Pretty good description of historic mortar, but geared towards mostly historic brick. I think the mortar discussion is still pretty relevant. https://www.nps.gov/orgs/1739/upload/preservation-brief-02-repointing.pdf I agree that mortar type and strength varies widely based on time of...
  10. RWW0002

    How They Do This?

    I think the concern is over bending in the bottom chord. Either the splice plate has to take bending (never seen that and my gut says to avoid it) of as XR pointed out the bottom chords would have to cantilever each direction to the splice. I agree with your concern over the condition, but do...
  11. RWW0002

    Flat Roof Deck, detail options

    There are standoff systems for pavers specifically intended for rooftop occupancy. The system allows drainage under pavers while holding them off of a membrane surface. I have never driven the boat on specifying them, but have dealt with various systems Arch has specified several times. I...
  12. RWW0002

    Roof live load wood duration factor

    NDS Commentary for Load Duration Factor appears pretty clear. C2.3.2 Seven Day Loads. Where the minimum roof uniform load specified by the applicable specified by the applicable building code exceeds the design snow load.... .. it is conventional practice to consider this load a construction...
  13. RWW0002

    Deck Pier/ Column Footings (Small Loads)- Confused myself completely (theory/ practical discussion)

    If you have not grabbed a copy yet, take a look at DCA6 from AWC https://web-media.awc.org/wp-content/uploads/2022/02/17210514/AWC-DCA62015-DeckGuide-1804.pdf Also, I think Knoxville B&C has a deck guide that is similar...
  14. RWW0002

    anchor rod holes in base plates

    The footnote to the table [D + 5/16 (for D <= 1"), D + 1/2 (for 1" < D <= 2"), D + 1 (for 2" < D)] yields anchor rod holes similar to historic - i.e. "green book" - anchor rod hole sizes. Tons of projects have been successfully completed with the tolerances necessary to meet these hole sizes. I...
  15. RWW0002

    lag bolt in middle of two ply 2x4

    With 1/4"Ø lag you might meet edge distance even in a single ply of the (2)2x. Any way you can shift the fastener over to the middle of a single ply of the (2)2x?
  16. RWW0002

    2 hour fire wall between townhouses

    I am not as familiar with the IRC provisions and limits as IBC, but both of these sounds like rated walls (Fire barriers, fire partitions) as opposed to firewalls. Firewalls are more rigorous and intended for very specific instances. Rated partitions and/or fire barriers are less restrictive...
  17. RWW0002

    2 hour fire wall between townhouses

    Rated walls (Fire barriers, fire partitions) and firewalls are two related but separate things. I agree that a 2 hour wall may be able to consist of 2 - 1 hour walls (see the "wiggle room" I referenced above with combined assemblies), and there are other materials besides brick that can make...
  18. RWW0002

    2 hour fire wall between townhouses

    The code is pretty specific on these, and unless the existing wall can be considered to have a rating (using existing brick finishes or similar), it is likely a no-go. This topic is often misunderstood and misinterpreted by contractors (and sometime code officials).. Here is some good content...
  19. RWW0002

    2 hour fire wall between townhouses

    I am not sure this is accurate. I think a "firewall" needs to be one of three things. 1. A Freestanding wall that will remain with collapse of either structure. 2 A double wall where each wall has a rating that meets code intent (there is some code wiggle room here with combining assembles)...
  20. RWW0002

    Moment Frame Partial Fixity with a hard upper limit

    Many may get a bit squeamish in assigning a "partially fixed" joint, as it feels like a bit of hocus pocus.. but is assuming a random % fixity to meet frame drift requirements (even if we know this fixity likely does not match reality), and designing for the resulting moment in the foundation...

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