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Thread: Channel in old plaster lath

  1. #11
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    One other thing to note in commercial buildings where some fire rating was desired very old plaster contains asbestos.
    Rob

    Moderator

    All responses based on the 2014 NEC unless otherwise noted

  2. #12
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    Quote Originally Posted by peter d View Post
    I'd use a grout blade on the multi tool, it will cut through old horsehair plaster like butter. Then I'd pull the lath out by hand.
    I used the grout blade and oscillating tool to cut in some retro- can lights last week.
    The job sucked! Those blades aren't cheap and I burned through 2 of them to cut-in 4 can lights!

    I didn't anticipate that when I bid the job!
    It took longer than anticipated and made a nasty mess of the living room!

    Live and learn!

  3. #13
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    Quote Originally Posted by sw_ross View Post
    It took longer than anticipated and made a nasty mess of the living room!
    I have been there!
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  4. #14
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    Quote Originally Posted by sw_ross View Post
    I used the grout blade and oscillating tool to cut in some retro- can lights last week.
    The job sucked! Those blades aren't cheap and I burned through 2 of them to cut-in 4 can lights!

    I didn't anticipate that when I bid the job!
    It took longer than anticipated and made a nasty mess of the living room!

    Live and learn!
    Next time use a reciprocating saw with a cast iron cutting blade (or a masonry cutting blade if you can find one). Works well. Blade is thin enough to turn a tight radius.

  5. #15
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    Quote Originally Posted by sw_ross View Post
    I used the grout blade and oscillating tool to cut in some retro- can lights last week.
    The job sucked! Those blades aren't cheap and I burned through 2 of them to cut-in 4 can lights!

    I didn't anticipate that when I bid the job!
    It took longer than anticipated and made a nasty mess of the living room!

    Live and learn!

    Uhh! Don't you know they make carbide grit hole saws for this? Long thread on it awhile back.

    -Hal

  6. #16
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    Quote Originally Posted by growler View Post
    I would do whatever Larry suggest that way I would have someone to blame it on if I screw it up.

    Actually I would probably just tell them to get whoever is going to be doing the patch work to cut the channel.

    Probably 200 years of lead based paint. Sounds like about 10 sq ft to be removed.
    That's what I would do too. In fact, I always ask my customers to use a carpenter or handyman to do tasks that are quite involved from a carpentry standpoint. I don't have the right tools anyway, and this is one of the reasons I don't. It is beyond the scope of what I do.

  7. #17
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    Quote Originally Posted by sw_ross View Post
    I used the grout blade and oscillating tool to cut in some retro- can lights last week.
    The job sucked! Those blades aren't cheap and I burned through 2 of them to cut-in 4 can lights!

    I didn't anticipate that when I bid the job!
    It took longer than anticipated and made a nasty mess of the living room!

    Live and learn!
    Another thing.. if the house is old enough to have hard plaster with lath, then it's old enough to have ungrounded wiring throughout, possibly even cloth-covered or old BX. I would have passed on that job.

  8. #18
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    Just use a circ saw with a carbide blade. Fastest, cheapest, and probably cleanest.
    Ethan Brush - East West Electric. NY, WA. MA

    "You can't generalize"

  9. #19
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    6" x 20' is either one very tall ceiling, or you're going horizontally.

    In either case, you want to minimize vibration to avoid destroying plaster keys. Then you'd have a job trying to re-anchor the plaster.

    I like the idea of the guy who's going to patch the plaster is the guy to cut the channel.


    New question-- what in the world is being installed? If you're going horizontally, are you going to have to notch the heck out of the studs??

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