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  1. bsrd

    STC rating between apartment units.

    Thnks, Tmoose, I contacted their tech support, that's where the detail came from in my post. I have a feeling it's going to be one of those things that noone gets back to me.
  2. bsrd

    STC rating between apartment units.

    I am trying to determine an STC rating between some apartment units that are on the upper floor with in an unvented attic. This is an existing condition where the demising walls go to the bottom of the ceiling of the unvented attic. The attic had blown in insulation above the ceiling that has...
  3. bsrd

    Heating of a Ceiling Plenum

    Thanks for your responses, I have spoken to two other HVAC designers and they have never seen anything like this either. The plenum is between the roof deck and suspended ceiling and there is adequate roof insulation to protect from freezing sprinkler pipr. The AHU has coils in for chilling...
  4. bsrd

    Heating of a Ceiling Plenum

    I am in the process of hiring design professionals for overdue maintenance to about a 15,000 sqft office building that was built in 1980. After doing some investigation I realized that the ceiling plenum is being heated by two or three RTUs and then a large air handler brings in the heated air...
  5. bsrd

    Alternate Fasteners

    I am looking at the ANSI/AF&PA SDPWS - 2008 Table 4.3C Does anyone know if you are allowed to substitute a screw with the same diameter and length for a cooler or wall board nail?
  6. bsrd

    Combined floor joist and decking

    Has anyone used the combined section of a plywood or osb decking to the floor joist to limit deflection and increase the bending strength? If so what type of glue is recommended for this. Is this good practice?
  7. bsrd

    Air Bubbles in EPDM Rubber Membrane

    Could anyone enlighten me with what may have caused this rubber membrane to get these air bubbles in it. The EPDM was used in an attempt to seal up a leak on a metal roof that had a galvalume finish. I am not sure what type of adhesive was was used to adhere it to the metal panel. Is the EPDM...
  8. bsrd

    Gypsum wall board over wood sheathing for shear walls

    Skip it, found it in 4.3.3.3.2
  9. bsrd

    Gypsum wall board over wood sheathing for shear walls

    If I recall correctly I think we were allowed to add the gyp wallboard and the wood sheathing shear values together. Is that system still allowed. In the 2008 SDPWS I see that there is a table for wood over gyp and not sure what the reasoning behind this is. I will see if there is something...
  10. bsrd

    Natural Frequency of a structure and foundation.

    Thanks JoshPlum, I wasn't thinking of that because I was just thinking that part of the slab would be in tension or lifting, but this is not the case. Aggman, The material coming through the is recycled plastics and may amount to about 120 lbs The way I modeled it with a 22" slab supporting...
  11. bsrd

    Natural Frequency of a structure and foundation.

    I have been designing a structure to support a 10,000lb. vibrating conveyor that generates approximately 800lb. horizontal load and the frequency of the equipment is 9.5 Hz. The equipment sits approximately 20ft above the ground. To keep the structure from resonating the frequency of the...
  12. bsrd

    Opening in Concrete Wall

    Need to create an opening in an existing 12" thick concrete wall that is above grade, and supported out of plane to the wall at the top and bottom and is about 18' tall with the opening sill at about 1' above the bottom. The opening will be 12' wide and 10'high and was putting a beam at the...
  13. bsrd

    Precast T Wall Panels for Bulk Storage

    Yes your right and based on exceeding the bearing capacity of my soil it should be sitting on a footing to help resist the sliding and bearing capacity.
  14. bsrd

    Precast T Wall Panels for Bulk Storage

    I am evaluating precast T planks for containing materials due to bulk storage, such as sand or salt and I am having a diffcult time determining how they make these work for overturning and sliding compared to typical cast in place retaining walls. Actually I am just making it for overturning...
  15. bsrd

    explosion venting

    Thanks SteelyLee, Section 911 is in the International Fire Code my mistake. It's NFPA 68 the has the deflagration venting. I've designed some also but was always given the area, I never had to determine the area. Is it a function of the material stored?
  16. bsrd

    explosion venting

    Need some help in sizing the required area for explosion venting per NFPA national fire protection agency section 911. apparently the vent area is to be sized based on the room being designed for 100 psf outward pressure.
  17. bsrd

    Hollow Concrete Section

    Does anyone know where I can find information or guidelines for designing a hollow concrete section. These could be beams with fixed ends, or slanted columns with the beams attached into them?

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