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Thread: Doors - Accessibility Circulation clearances

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    Senior Member Alex Page's Avatar
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    Doors - Accessibility Circulation clearances

    We're adding door clearance families to our doors, and Im not quite sure how ADA clearances work
    Heres the problem:
    Australian Standard AS1428.1 has all the side clearances setout from the "Clear Opening" edges as per this diagram: and it states that "D= Clear Opening of doorway":

    Doors - Accessibility Circulation clearances-as1428.png

    But American ADA standards ares not so clear: it shows the side clearances setout from the edge of the jamb but doesnt explain it in writing:
    Doors - Accessibility Circulation clearances-ada.png

    Does anyone know where the ADA side clearances are actually measured from? Is it the edge of the jamb as sort of shown in the diagrams?

    If it is from the jamb, how does this work for double leaf doors? For the Australian standard it is just measuring from the clear opening of the primary leaf - but for ADA, is it still measured off both the jamb edges? Which means the required clearance goes past the full extent of the double door?

    (Also, if anyone could point me in the direction of british standards for this, it would be much appreciated!)
    Last edited by Alex Page; March 14th, 2019 at 01:32 AM.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    The honest truth is: it won't matter, for what you are doing in Revit.

    Unless you are parametrically allowing for the door panels/leaf to have configurable pivot points, you can't get the Australian version done correctly either, as it depends on both: panel thickness (super easy to account for) and shape/style of the hinges themselves (which drastically affect where the face of panel is located when the door is opened... That's the point of some of the L shaped hinges.)

    So, mine go to the points where the opening in the frame starts, but not the narrowest opening where the rabbet is, since that isn't always there either.

    For LIFE SAFETY egress, however, I have a fixed value per panel I remove from the exiting width (and it's conservatively greater than the thickness of the door panel) to make sure our egress calculations are always worst case scenario.

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    Forum Addict GMcDowellJr's Avatar
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    Quote Originally Posted by Twiceroadsfool View Post
    For LIFE SAFETY egress, however, I have a fixed value per panel I remove from the exiting width (and it's conservatively greater than the thickness of the door panel) to make sure our egress calculations are always worst case scenario.
    We typically use 4” to account for leaf thickness and hardware. I assume that’s fairly standard in the US.
    cganiere likes this.

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    Moderator cellophane's Avatar
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    Here's some good info:
    https://idighardware.com/2015/08/gui...rds-chapter-4/
    https://www.access-board.gov/guideli...-ada-standards
    https://www.access-board.gov/guideli...ors,-and-gates

    The I Dig Hardware site is amazing for all things door related when it comes to codes. The Access Board website has much better diagrams than the actual code book does. For what you need go to Chapter 4 (the 3rd link provided above.)

    The clearances are all based on a single panel. For a double panel door, the space in front of the second panel counts as part of the clear space - meaning they end up overlapping. And as long as your hardware is compliant, it does not alter the actual measurement taken (emphasis mine):

    404.2.2 Double-Leaf Doors and Gates. At least one of the active leaves of doorways with two leaves shall comply with 404.2.3 and 404.2.4.
    404.2.3 Clear Width. Door openings shall provide a clear width of 32 inches (815 mm) minimum. Clear openings of doorways with swinging doors shall be measured between the face of the door and the stop, with the door open 90 degrees. Openings more than 24 inches (610 mm) deep shall provide a clear opening of 36 inches (915 mm) minimum. There shall be no projections into the required clear opening width lower than 34 inches (865 mm) above the finish floor or ground. Projections into the clear opening width between 34 inches (865 mm) and 80 inches (2030 mm) above the finish floor or ground shall not exceed 4 inches (100 mm).

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    Senior Member Alex Page's Avatar
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    Thanks the the comments.

    Aaron, I get your point about hinge styles, but putting them in our doors is still going to be as accurate as other standard methods of showing them; but hopefully faster and more auto-parametric. Our door parameters tie to panel thickness, clear opening width, door hinge side "gaps" etc. Also,they can handle if there is a doorstop or not.

    Chad - thanks for those links, what a great site - pictures worth a thousand words! Thats cleared up what to do with double doors The problem Im having is not the "Clear Opening" definition, but where the "Maneuvering Clearance" side dimensions are measured from. In australia its measured from the edges of the Clear Opening Width...but the ADA diagrams dont show that, and its not clear from the diagram from the site:
    Doors - Accessibility Circulation clearances-ada.jpg

    I was going to assume its measured from the clear opening....but, as said, not obvious from any diagram Ive seen; they all look as if its measured from the edge of the jamb face...
    Last edited by Alex Page; March 15th, 2019 at 01:48 AM.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Quote Originally Posted by Alex Page View Post
    Thanks the the comments.

    Aaron, I get your point about hinge styles, but putting them in our doors is still going to be as accurate as other standard methods of showing them; but hopefully faster and more auto-parametric. Our door parameters tie to panel thickness, clear opening width, door hinge side "gaps" etc. Also,they can handle if there is a doorstop (rabbat) or not.

    Chad - thanks for those links, what a great site - pictures worth a thousand words! Thats cleared up what to do with double doors The problem Im having is not the "Clear Opening" definition, but where the "Maneuvering Clearance" side dimensions are measured from. In australia its measured from the edges of the Clear Opening Width...but the ADA diagrams dont show that, and its not clear from the diagram from the site:
    Click image for larger version. 

Name:	ada.jpg 
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    I was going to assume its measured from the clear opening....but, as said, not obvious from any diagram Ive seen; they all look as if its measured from the edge of the jamb face...
    Oh, to be clear, I think it's worth doing. I just don't think I'd worry about whether it's showing from the edge of the frame hinge (back side of panel), or the front side of panel. What I was saying is the front face of the panel in the opened position, can be in different places. So it's hard to be accurate without accounting for hingepoints.

    In the US, we can show the ADA clearances from the edge of the frame. Meaning the clear square overlaps the door panel. I don't know why that's acceptable either, but my doors ha e been that way for 4 years, and tons of people use them that way. It seems weird to me too. LOL.

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    Senior Member Alex Page's Avatar
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    Aha - then (and this is what stopped me doing it from the edge of the jamb (frame)) - what do you do for double doors; measure from the edge of the "primary" panel in the closed position?

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    Forum Co-Founder Twiceroadsfool's Avatar
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    I dont follow your question. All of our clearances start off at the hinge point of the door. On a double door, its no different. There are just two possible clearances that you can use: The left one or the right one, depending on which panel you are saying is accessible.

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    Senior Member Alex Page's Avatar
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    Aaron: Example as below. This is what I havent (yet) found document rules for
    Doors - Accessibility Circulation clearances-ada-question.png

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Gotcha. Now i understand.

    Well, in those images, both of those are the same thing: On a single door, the edge of Jamb/Frame is the same as the edge of the other panel (or glazing sidelight, etc), in a double door. That surface is intended for someone to just put a hand on, so all of those things count.

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