SLOPES

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    Rebekka O'Melia (Edited )

    Ballast says 5% for a parking lot would be maximum.

    You can have a road with up to 10% slope, but it'd be steep.

    3% slope max. for usable grass recreation areas.

    Hope this helps!

    Rebekka O'Melia, Registered Architect, NCARB, B. Arch, M. Ed, Step UP, Step UP ARE 5.0 Courses

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    Yvette Louka

    Thank you

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    Mark Baker

    More fun facts:

    Also remember that the ACCESSIBLE WALKWAY in a parking lot to the front entrance should not be greater than 1:12 (8.33%) in the direction of travel.

    A 13% slope is the maximum recommended slope for a driveway.

    A 5% slope means that the ground grade changes 5 feet over a length of 100 feet.

    Mark, Archizam - ARE 5.0 Practice Exams

     

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    Kailie Johnson

    I have also been finding conflicting information on typical developable slopes!

    There is different information between the Ballast Guide, Building Construction Illustrated, and a few other sources. NCARB 5.0 uses Site Planning and Design Handbook as a major source of questions. Table 7.4 in SPDH has a list of typical grading standards. Can anyone confirm if this is most reliable to understand / memorizes for the test?

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    Kirill Ryadchenko (Edited )

    If your question is what is the maximum allowed parking slope then the right answer is 1:15 or 6.67% as stated in IBC 406.4.3

    "...
    Vehicle ramps that are utilized for vertical circulation as well as for parking shall not exceed a slope of 1:15 (6.67 percent).

    ..."

    But if the question is asking about preferred parking slope then look for clues in the question that will nudge you toward the right answer and keep in mind that a slope less steep than 1:20 is an accessible surface. Anything above it will require a railing.

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