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  1. LeeEng

    Are fire dampers required at 1-hr shaft walls?

    Thank you for the responses. I do see the 1-hr wall on diagram. My original thought was that it does not need a fire damper, but I was having trouble proving it to myself. However, I think my confusion stemmed from the same figure and some of the language in 90A. The figure shows a 3-story...
  2. LeeEng

    Are fire dampers required at 1-hr shaft walls?

    I could use a bit of help trying to understand the code requirement for fire dampers at shaft walls. I was reviewing a building air system design that includes a duct riser that extends from the roof down three floors. The shaft wall is noted as 1-hour rating (as expected). I understand in a...
  3. LeeEng

    Gymnasium Duct Insulation Recommendation?????

    Thanks for all the assistance. I do have a question regarding the recommended insulation length - 12'. Will the remainder of the duct surface main (about 50') be greater than the space dew point temperature. I figured the insulation would maintain the metal duct temperature further...
  4. LeeEng

    Gymnasium Duct Insulation Recommendation?????

    Thanks. That is my concern. The unit is currently designed to be shutdown during the "unoccupied hours". In the humid summer months, I think this could cause a concern with moisture during system start up. The RTU has a preheat and DX coil. Has anyone every seen a the coils reversed? If...
  5. LeeEng

    Gymnasium Duct Insulation Recommendation?????

    The roof is a corrugated metal deck that is supported on an open joist system. As far as I can tell, there is no plenum. The return air is pulled from the floor level and is sent up two shafts to the roof top units. In the arena you identified, did you have condensation problems?
  6. LeeEng

    Gymnasium Duct Insulation Recommendation?????

    I am requesting some assistance/direction in the design of an air-conditioned gymnasium. The system (DX rooftop) will provide cooling during occupied hours for the summer months. My concern is that there may be a condensation problem on the uninsulated ductwork currently designed. The lead...
  7. LeeEng

    Composite Steel Floor Deck Design

    Thanks Dik for the input. I would agree that I should contact a local contractor. As for roof trusses, I am sure that they would be entertained if the overall cost was advantageous. However, he is not looking to give up any floor-to-floor height. The requirement for a composite roof is...
  8. LeeEng

    Composite Steel Floor Deck Design

    Thanks, I think I may be headed in that direction. Do you happen to know anyone? It's really a simple design, but I'm not sure I'm ready to take the risk on this design.
  9. LeeEng

    Composite Steel Floor Deck Design

    I've found myself in a bit of a connundrum. I had offered to assist a friend of mine with a residential home design, but I may have gotten in over my head. He is looking for a concrete house to be built in tornado alley (Oklahoma). The architectural design is very simple - 2 stacked...
  10. LeeEng

    Concrete Software Recommendations?

    "What types of members are you going to be designing? Beams, columns, walls, etc..?" I regard to the types of members, it will include all the above (beams, columns, walls) and floor/roof slabs. I am currently working on a 2-story concrete home where the client is looking to use concrete for...
  11. LeeEng

    Concrete Software Recommendations?

    There are many concrete design software solutions available across the internet. I am in the market to upgrade to a new software and I'm interested to hear which ones perform well and are user friendly. I will use it primarily for small commercial and residential buildings. Thank you.

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