NCARB question regarding ballast zone diagram

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Mojdeh Azani

August 06, 2023 17:16

Hi,

Can someone explain this question to me? I don't understand how to read it what does h mean? how is the zoning done?  and where can I find the resources for this question?

 

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  Dennis Bro August 07, 2023 00:14

  It is designed to make you think.  The Roof Height minus the existing grade elevation will give you the height of the building.  1361-1321 = 40'.  Which is h, so h=40.  Each corner is defined as "Item 3" in terms of the height h, or 60% of the height.  The "fascia" along each side of "item 3" is .6*h=.6*40=24'

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  Blane Hammerlund August 08, 2023 13:59

  Yeah, this one was strange to me too. Is the answer saying that the building is 40 feet tall, and the roof ballast is at 24 feet? Wouldn't this mean that the parapet is 16 feet tall?     

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  Brendan Clifford August 09, 2023 00:32

  what is a ballast zone????

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  Brett Bowers August 09, 2023 02:54

  Blane, the question is asking about the length of the 'leg' of zone 3, not the depth/height of the ballast.

  According to the diagram, the width of ballast zones 1 and 2 would also be 24 feet, with zone 1' making up the remainder of the roof area.

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  Brett Bowers August 09, 2023 03:15 (Edited August 09, 2023 04:36)

  The question specifically asks about the length of the zone along the fascia, not depth. For the ARE, focus only on what's specifically being asked.

  A ballast depth for each zone would accompany the diagram, in practice. The purpose of the diagram is only to explain the extent of each zone.

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