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How Demolition is Portrayed In Drawings

  • 1.  How Demolition is Portrayed In Drawings

    Posted 24 days ago
    Hello all,

    When showing lines to be demolished, how do you show it in your drawings? 

    For us, we pair a small crosshatch over the piping in question, and then we use a dashed line for the pipe. The drawbacks for these is that crosshatches aren't precise enough for many situations, and dashed lines are already used in for venting. I'd like to see what others in the industry use for this.

    Thanks in advance!

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    James Fiorini
    Plumbing Engineer
    Hixson Inc.
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  • 2.  RE: How Demolition is Portrayed In Drawings

    Posted 24 days ago
    Typically, we shade back the existing to remain so the demo fixtures and pipe are prominent on the drawing. We use a point of demolition symbol, which looks like a diamond split vertically down the middle, one side with solid hatch the other side not hatched, at the point where the demo is to start. We place a series of large, bold, X on the demolished pipe spaced about 1-2 inches apart on the finished sheet. We outline any demo'd fixture with a dashed or hidden line while any fixtures to remain are solid line but shaded back.  We also provide a keyed note for each fixture so our intention is clear.

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    Mark Tistle
    Plumbing Designer
    Pettit & Pettit Consulting Engineers
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  • 3.  RE: How Demolition is Portrayed In Drawings

    Posted 21 days ago
    If you use Revit and phasing then the demoed piping, ductwork, equipment, etc. automatically becomes dark and dashed.  I think that with that along with notes it is very clear what is being demoed.  


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    Nicole Parker [CPD,CFPS, LEED GA]
    Engineer Designer
    BVH Integrated Services, PC
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  • 4.  RE: How Demolition is Portrayed In Drawings

    Posted 21 days ago
    Hey Nicole,

    Thanks for your response! This is generally how we do it now, but with some drawings where new vents are being installed and demolition executed, we wanted to see what others do to ensure clarity. We also work with many existing buildings, so we have plenty of greyed-out lines already.

    ------------------------------
    James Fiorini
    Plumbing Engineer
    Hixson Inc.
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  • 5.  RE: How Demolition is Portrayed In Drawings

    Posted 21 days ago
    James,
    I for the most part do only renovation work as well since all my projects are hospitals.  You said you have new vents as well, do you not do separate demo drawings?  We have demo & new drains, this way it is very clear.

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    Nicole Parker [CPD,CFPS, LEED GA]
    Engineer Designer
    BVH Integrated Services, PC
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  • 6.  RE: How Demolition is Portrayed In Drawings

    Posted 21 days ago
    For small enough demo and installation we fit them to the same drawing, but typically they are separated. This issue certainly isn't happening frequently, but we wanted to see how other professionals in the industry handle their line management.

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    James Fiorini
    Plumbing Engineer
    Hixson Inc.
    ------------------------------