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    silverback1951's Avatar
    silverback1951 Posts: 3, Reputation: 1
    New Member
     
    #1

    Oct 12, 2009, 11:44 PM
    Macerator waste
    I need to run the waste for my macerator between ceiling and floor. This requires the drilling thru' of joists. How can this be achieved safely.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
     
    #2

    Oct 13, 2009, 05:10 AM
    What size floor joists are we talking about and what size is the discharge line? Tom
    silverback1951's Avatar
    silverback1951 Posts: 3, Reputation: 1
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    #3

    Oct 13, 2009, 08:04 AM

    Floor joists are six by two and the discharge pipe is 32mm
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #4

    Oct 13, 2009, 08:23 AM

    Is the ceiling open or closed? You will also need to make each hole slightly lower than the previous hole so you maintain a 1/4" pitch
    silverback1951's Avatar
    silverback1951 Posts: 3, Reputation: 1
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    #5

    Oct 13, 2009, 08:49 AM

    Closed ceiling
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
     
    #6

    Oct 13, 2009, 10:40 AM

    You will need to open the ceiling or the floor, no 2 ways about it. Cutting the holes correctly is only the first trick, installing several sections of PVC glued together one at a time is the next task.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
     
    #7

    Oct 13, 2009, 11:11 AM

    I agree with Ballangerb1. Also, do not notch the joist - drill them. You will have to measure with precision so you don't kill the slope. With 5 1/2" of joist and 1 1/4" pipe - do don't have too much room for error.

    How far is this pipe going in that ceiling ?

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