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  • Users: OHEcoEng
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  1. OHEcoEng

    Wind Zones/Analysis on Complex Roofs

    I have been pondering this for a while now, and decided to see if anyone has any perspectives on this issue. Refer to the attached jpg showing a roof being considered for a solar array. The attached detail shows a hip roof with multiple dormers; three dormers on the SE corner of this building...
  2. OHEcoEng

    No net load increase with building modification - review necessary?

    Hi, everyone, hoping for a little enlightenment... I am holding up a permit application for a solar array installation because I won't sign off on the structural section without doing a full review. This is residential structure with a flat roof. I have the original building plans and truss...
  3. OHEcoEng

    Attachment of thermal collectors to decking or joists

    Hello, all. I am currently working on establishing a connection method for solar thermal collectors to a roof deck. We're good with the additional dead load, but I am concerned with the proposed attachment method. Background: The system consists of two parallel timber "curbs" 6"x12"x 24'...
  4. OHEcoEng

    Typical density for lightweight concrete

    Hello, everyone. I have been trying to figure out a concrete density for a month or so now. I went so far as to have a core sample of the roof taken. Unfortunately, I didn't call for the sample personally; it went through the building owner, and calculating density wasn't part of the job. In...
  5. OHEcoEng

    Roof analysis - does this sound acceptable

    Hello, everyone. First of all, no I am not a student, and I am not a structural engineer. I am a PE with two degrees in Civil Engineering and 15 years experience in the environmental/wastewater field. I have posted a couple times in the past couple months with specific questions regarding wind...
  6. OHEcoEng

    Performing a solar structural analysis - lightweight concrete

    Hi, everyone. I am, once again, looking at an existing building's capacity for a ballasted PV system, which wil add approximately 4 psf dead load. I have been through ASCE 7-05 calculations using several variables for the existing roof, but keep coming to the conclusion that the roof structure...
  7. OHEcoEng

    Additional roof loading from solar array

    Hi, all. I am new to these forums and I hope that I can invoke a little interest in the alternative energy field. I have been a practicing PE for 10 years now in the wastewater/environmental field. I recently made the jump to solar and wind design. I certify electrical diagrams for these...

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