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Front door orientation for energy compliance

Discussion in 'Residential Energy Codes' started by Bryant, Apr 22, 2019.

  1. Bryant

    Bryant Registered User

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    interestingly enough are all things energy conservation minded, but I can not find a section or reference material indicating when the IRC requires the front door orientation to be indicated, compass wise, for any form of energy compliance. Looking at the prescriptive requirements of 2015 IRC 402 (N1102), nothing stands out, including footnotes to require the front door orientation to be indicated.
    Not having chased this down to a manual J, so I am not sure if there is something there requiring door oreintation be identified, but maybe there is.
    anybody know what drives this?
    thanks
     
  2. Rick18071

    Rick18071 Sawhorse

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    Zoning laws usually have requirments of where the front of the house is.
     
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  3. my250r11

    my250r11 Sawhorse

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    Zoning maybe, if it has a street in front that's the front, if alley that's rear here. Nothing about the door having to face the street. We have the home addressed on the street side weather the door is there or not.
     
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  4. conarb

    conarb Sawhorse

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    I think Bryant is confusing the 'Energy Code' with the 'Green Code', many Green Codes require front doors with porches so people can sit on the porches and 'commune' with their neighbors, they also want glass in their front doors so people can see in and out, it's all part of 'communitarianism' in the coming green utopia, most of these requirements aren't mandatory but a designer has to pick and choose from a cafeteria of options to amass the requisite green points to comply, it's not compass related but rather street or community square related, it's also one of the codes driving prices through the roof.
     
  5. tmurray

    tmurray Sawhorse

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    Our code requires the ability for an occupant to be able to see who they will be opening their door to.

    Door orientation is a little heavy handed in any code/law. I could maybe see it in a historic district...
     
  6. Bryant

    Bryant Registered User

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    Sorry off a few days:rolleyes:
    The question is about the orientation for the front door as part of ANY energy requirements, of which I have found nothing to suggest otherwise. But is very apparent on the HVAC design work sheet, (residential) asking for door's orientation on the worksheet). Maybe zoning, but its driven by a design criteria (identify orientation) of which I do not understand what the difference makes. It's not a daylight zone or some other creature of the energy code, unless I am missing something.
    Anyway, not loosing any sleep over this, just thought some others may have encountered this...
    thanks
     
  7. tmurray

    tmurray Sawhorse

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    It is important when designing the HVAC because it impacts the solar heat gain. Just needs taken into account to properly size a system.
     
  8. conarb

    conarb Sawhorse

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    Yes, but only if it's a glass front door, a solid wood door doesn't allow solar heat gain, a glass front door is just like another window, and it can admit beneficial or detrimental solar heat gain so orientation does make a difference just like with windows.
     
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  9. Rick18071

    Rick18071 Sawhorse

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    I wonder why the back or side doors doesn't count
     
  10. tmurray

    tmurray Sawhorse

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    all fenestration should count. I'm wondering if this is just someone's worksheet they put together and only listed the front door because it is the one that typically has the glass in it.
     
  11. mp25

    mp25 Registered User

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    from what i heard the intent was to provide a quick confirmation that the paperwork matches the plan i.e. when building the same house over an over again the calculations reflect the proper orientation of the house.
     
  12. Bryant

    Bryant Registered User

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    Interesting responses thanks to all!
    I would admit that it is a paperwork check with the site plan and the HVAC design worksheet. i can see no practical benifit, unless it was as one posted, a SHG coeffiency, even a wooden door has heat transference capabilities but that is picking apples and oranges in the residential world. For example if using a commerical model, one could trade off R- value and U-factor in that one is a membrane as in layers of a assembly, whereas each piece is quantified (u- factor) and the other spectrum is the coverage of insualtion (r-value) in the spaces. In so far as the res energy code driving this, i can not find it
     
  13. Bryant

    Bryant Registered User

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    follow up. Most of the HVAC programs follow ACCA for manual J & D thus include in the data the door orientation. But begs the question, if the door is a solid core door with no glazing, what's the point other than a u factor conversion for an R- value?
     
  14. ADAguy

    ADAguy Sawhorse

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    Think "Feng Shay" (smiling)
     
  15. mark handler

    mark handler Sawhorse

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    It becomes important when modeling a housing tract. The orientation of the front can change based on where the house is plotted. Window values (U-factors, SHGC, and VT) can be different if the front is redirected from original computer run. the easiest way to determine the front is direction door faces.
     
  16. ADAguy

    ADAguy Sawhorse

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    Follow the sun! It rises in the east and wakes you, sets in the west keeping you warm, minimize windows on the south to lower heat gain or use trees and overhangs to control seasonal heat gain/loss, North allows for wind flow depending on prevailing direction to cool house. I am on the south slope of a mountain range with this kind of orientation and have balanced heat gain and loss through most of the year. Was it planned that way back in 05'?, probably not but it sure works. Most subdivisions don't take this into consideration.
     
  17. Bryant

    Bryant Registered User

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    Not always the front door orientated to the sun, we have many houses in a wagon wheel fashion with the rear loaded to the hilt with glazing. Ironically, shades down in the summer, wide open in the winter. Seems to me its a battle of the elements, choosing between being cool all summer along or warm in the winter, preference.
     

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