Class A Install: which installer is "right?"

Charles Bourque Posted By Charles Bourque, May 23, 2013 at 8:32 PM

  1. Charles Bourque

    Charles Bourque
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    Feb 13, 2013
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    Talked to two guys who install class A chimneys. One guy says, "the ceiling support box has to extend 18" below the ceiling." The other guy says, "nah, since you're only going through 1' of attic, just use a
    24" ceiling support, put it 3" below ceiling, let the top of it out through roof, screw it in to framing, then cut the excess above roof in several places and nail down the flaps." Second guy says that eliminates need for attic insulation shield.

    Who's righter? Second guy makes me nervous, but if he's right, I like his approach.
     
  2. webby3650

    webby3650
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    Sep 2, 2008
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    The second guy is right. Most manufacturers require the box to extend only a few inches into the room. The amount changes only changes if it's a cathedral ceiling, the steeper the ceiling, the farther the box needs to extend into the room.
     
  3. Holiday

    Holiday
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    Feb 18, 2013
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    My install manual says 3" below the ceiling.
     
  4. Delta-T

    Delta-T
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    Feb 27, 2008
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    i bet there are some differences between manufacturers...I'd reference the particular manufacturers literature.
     
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  5. webby3650

    webby3650
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    There is a little difference, but it's never 18"! This shows a lack of experience on the part of the potential installer. He think the stovepipe needs to be 18" from the ceiling measured vertically. Thats incorrect.
     
    BoilerMan likes this.
  6. webby3650

    webby3650
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    Above all, this is the most important.
     
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