List of Contributions

​It's been a while since I had to deal with high temperatures on foundations (first 7 years out of school dealing with steel mill equipment....), but I'll give it a shot: - extreme high temperatures - I don't recall the threshold - can deteriorate the concrete itself regardless of the amount of rebar. ...

ASCE7-10 wind loads are ultimate loads; ASCE 7-05 wind loads are unfactored​/service level. If you're using ASCE 7-10 winds, you need to scale them down to unfactored loads when checking wind deflections. IMO, I see this change as causing a lot of confusion among some engineers and a lot of owners ...

I agree with Chad's comments. Additionally I'll note that I've known some PE's who are very thorough ​with their calcs and designs (including one who was not a college grad but gained his PE by examination when that was allowed). I've also met SE's who were less than thorough (complacent? practicing ...

​The ICC site was down yesterday morning but is back up again today. Sure enough - looking in the 2018 Plumbing Code (Section 1108 - Secondary (Emergency) Roof Drains), it still says "Secondary (emergency) roof drain systems shall be sized in accordance with Section 1106 based on the rainfall rate ...

​I'm thinking that using the diagonal distance is conservative. That long diagonal distance is only accurate for a very small length of the roof step and drops off proportionally as you move along the step (the diagonal distance feeding the drift decreases). You might make a case for increasing the drift ...