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Newb with questions

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by Tanksalot, Nov 24, 2012.

  1. Tanksalot

    Tanksalot New Member

    Joined:
    Nov 24, 2012
    Messages:
    4
    Hi All,

    I've been lurking & searching for a couple weeks and just can't sort out what I should do. I want to start off with a big THANK YOU for your generosity and shared knowledge/experience.

    I just pulled out an ancient BK slammer insert that the PO never connected to the flue, smokey, loud, inefficient, warped chamber with a rip connecting it to the room-air chamber. Actually cooled better than it heated and I always worried when we used it.

    Now have an Enviro Boston 1700, impatiently waiting to go in. I've a 19-teens farmhouse, 2 story (800ft^2 2nd, 1000ft^2 main, unheated basement); the scary, DIY'd, basement oil furnace replaced with a heatpump & central heat/air ducts. It's an external brick chimney; from basement floor to top it's probably 32', fireplace damper to top is 20', no liners, double flues (one to main floor fireplace, other to basement for oil furnace) but their separation stops about a foot below the crown. No cap, just mortar on top of the last tier of bricks (crown?). So chimney top is just an 8x19 opening "rain bucket" that widens a foot below the crown into two 10x10 flues. The fireplace damper is a 12x30 rectangular unit which has an 5x27" opening operated with a faucet handled worm-screw opener offset above the hearth.

    I just got an flexible SS kit: 25'x6" flex, rain-cap w/18x18 SS flashing attached and the attaching collar and want to install soon. I've talked to a mason friend of ours who'll help and a couple retailers, they all scoffed at the idea of insulating and a block-off.

    Insulation question: Will I need it? Will it fit?
    Block-off plate: Pretty sure I'll need it due to no chimney cap or separation from basement flue ie.. open from above and below.

    I'm thinking I'll put on a DIY'd metal cap and block-off plate to get into this season then improve when weather is better.

    Can you offer me advice or point to threads that'll help me out?

    Thanks.

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  2. EatenByLimestone

    EatenByLimestone Minister of Fire

    Joined:
    Jul 12, 2006
    Messages:
    4,758
    Loc:
    Schenectady, NY
    So you have 2 flues going up the chimney that become 1 flue just below the crown. Place a few bricks into the chimney to make it 2 flues. Then you can line it.

    A 6" liner will fit into a 10" by 10" flue, even if it is insulated. You will notice a better draft due to the increased flue velocity.

    Matt
  3. Tanksalot

    Tanksalot New Member

    Joined:
    Nov 24, 2012
    Messages:
    4
    Good idea. My mason friend can bang that out in just a few minutes on top of the install help. So you think I "need" a liner or would that just be good insurance at this point?
  4. PLAYS WITH FIRE

    PLAYS WITH FIRE Minister of Fire

    Joined:
    Jan 28, 2011
    Messages:
    639
    Loc:
    Pittsburgh, Pa.
    Definitely a liner! Better draft, easier to clean and safer!
  5. Tanksalot

    Tanksalot New Member

    Joined:
    Nov 24, 2012
    Messages:
    4
    Oh yes, definitely a liner. But, what should I use to seal around the cap, insert collar and block-off plate?
    Thanks
  6. PLAYS WITH FIRE

    PLAYS WITH FIRE Minister of Fire

    Joined:
    Jan 28, 2011
    Messages:
    639
    Loc:
    Pittsburgh, Pa.
    The cap you can use some rtv or something with higher temp ability.

    The collar and possibly the block off plate can be sealed with furnace cement.

    If the block off plate has too large of gaps you can Roxul which is really nice to use cause you can stuff it up in the smoke shelf to really lock in the heat.
  7. Tanksalot

    Tanksalot New Member

    Joined:
    Nov 24, 2012
    Messages:
    4
    Yahoo, it's in and running. Almost 24hrs straight now. Couldn't get the liner down the chimney with insulation; got stuck 2/3 way down couldn't pull it w/o an 8' lever, decided to go w/o insulation. Had to cut out the damper plus a few bricks to get the liner down onto the collar. Review coming soon. Now to climb the learning curve.
    etiger2007 likes this.

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