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  1. DRsquare

    Code Requirements for Air Handling Units

    The Florida Building Code requires the smoke detector in the supply, to protect against fires in the HVAC system and outside air. Area detectors protect inside. NFPA gives additional guidance on placement in supply or return.
  2. DRsquare

    Residential HVAC Sizing

    I'm a building plans examiner in FL, and the energy code requires the capacity of the installed equipment to be no more than 115% of the load. Typical load calculations are ~80%SHR, while the capacity is always figured at 70% SHR. This gives a unit which has less sensible capacity than load...
  3. DRsquare

    Removing Roof Space Sheating for Radiant Barrier OSB

    http://www.energysavers.gov/your_home/insulation_airsealing/index.cfm/mytopic=11680
  4. DRsquare

    Great wood waste management project

    The CO2 gets absorbed by new trees, so it is somewhat carbon neutral. Long term growth, 10 yrs? is better for soil nutrients than plowing every year for other crops. Wood waste would get burned anyway at wood products mill.
  5. DRsquare

    Lightning Protection vs. Lightning Elimination

    Just some random comments. Fiberglass sailboats may not have a good ground to the water, although I've read articles recommending grounding the mast. Also, I was biking the Blue Ridge Parkway up around Mt Mitchel when a thunderstorm hit. Crouching along the side of the road was OK, but if I...
  6. DRsquare

    Residential shear walls

    I am working as a plans examiner, and have seen several designs using interior shear walls. These are generally connected to trusses parallel to the shear wall, but not necessarily directly over the shear wall. I have started requiring a sign off by the truss engineer, as well as a foundation...
  7. DRsquare

    Residential foundations for expansive clay

    I'm working as a plans examiner in north central Florida. We have expansive clay in some locations, and the comon fix seems to be cast in place concrete piles. The troble is, no one wants to really take the time or expense to obtain soil borings and actually do a rational engineering desigh...
  8. DRsquare

    Wood Truss Connection Question

    I know this has been discussed many times, and I have read all of those discussions I could find. I agree with the same method as JAE and UcfSE. I often use buildings of all heights method because many residential buildings aren't rectangular. In those cases I also look at Case 3 shown in...
  9. DRsquare

    Beam bearing on piers

    Thanks DRC1, Thant's a good sugestion. I hadn't thought about the pier holding together during the pour. Even a switch to structural brick would be an improvement. It is common now, to make it look historic.
  10. DRsquare

    Beam bearing on piers

    Thanks, I do need to get it on paper. The bricks piers sit on a concrete foundation and would be above ground. It just seems like the load is on a brick veneer, which isn't entirely true because the brick sits on the concrete. Intuition isn't always right, but it's dangerous to ignore it...
  11. DRsquare

    Beam bearing on piers

    I'm biding on a remodel/rebuile of a small historic house (1200 SF). The architect has specified brick faced piers on foundation pads with rebar and tie downs. The pier is to be constructed by laying the brick in an open box shape and filling it with concrete. The bricks will have tabs that...
  12. DRsquare

    Dust Control

    Fences up wind of the site reduce the wind speed which reduces the entrainment of dust. It was usually about 50% density. The amount of area downwind of the fence is proportional to height, but I forget how much. Maybe 10 times the height? You can also water or mulch or use commercial sprays...
  13. DRsquare

    Wood shear wall / diaphram capacities

    zenom, Thank's for yout explaination. It's nice to know why, and not just how.
  14. DRsquare

    Wood shear wall / diaphram capacities

    Thanks, I can buy that. But what bothers me is that Table 2310.2A for horizontal wood structural panel diaphrams has a foot note that states the values are already increased for short term loads from wind, and should be reduced 25% for normal loads (ie. a 33% increase for wind.) This is...
  15. DRsquare

    Wood shear wall / diaphram capacities

    In the Florida Code, Tables 2310.2A,B. give values of allowable shear for walls and diaphrams as a function of panel thickness, nailing etc. The footnote at the bottom of table A (but not B)states that these values are for short-term loads from wind and must be reduced 25% for normal loading...
  16. DRsquare

    Wind Loads on Open Buildings in ASCE-7

    ajh1, Thanks, thats a big help. My email is drrixx@bellsouth.net
  17. DRsquare

    Wind Loads on Open Buildings in ASCE-7

    I posed this question in Sturtural-other, but this looks like the better forum. Please excuse the duplication, but my question is how to determine wind loads on open buildings with other than monoslope roofs. ASCE-7 Chapter 6 seems to sidestep this issue entirely, as does the "Guide to ..."...
  18. DRsquare

    Wind Loads on Structures

    I'm new to wind loads also, and I have a question I hope someone can answer. ASCE-7 does not give a Cf for any open buildings except those with monoslope roofs. What are you supossed to do for open buildings with other roof types. I find it strange that there is no discussion of this in...
  19. DRsquare

    Ambient air monitoring

    It also depends what question you are trying to answer. I assume you want something like concentration or mass emissions. Concentration of course depends on dilution (wind speed). Mass emissions require determination of emission profile with height and direction. Emission rate is also...
  20. DRsquare

    Environmental Paradox in perception

    When you consider that thrre are a crop, just like corn, you no more save a tree by recycling paper than you save a corn plant by not eating corn. With the cols of collecting, transporting, repulping, and cleaning used paper, it ends up costing more than virgin pulp. Thirty percent of the...

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