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  1. #1
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    Default furnace in attached shop

    I pulled this from a previous post:
    "Appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457mm) above the floor in garages. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate with a private garage through openings shall be considered to be part of the garage." M1307.3 of the 2006 IRC mechanical code

    The setup was a garage and shop. The shop is in the back of the garage, separated by a self closing door, but on the same level as the garage. There is a solid wall between the shop and garage, with just the door. There is a wall furnace in the back shop, with the burners 10" from the floor.

    Since this is directly accessible from the garage, should this furnace have been installed higher so that the burners were at least 18" from the floor. You can't drive into the shop, it's a wood shop only. Also, we are under the IMC for plumbing in our state, if it makes any difference.

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    Jim Robinson
    New Mexico, USA

  2. #2
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: furnace in attached shop

    Quote Originally Posted by Jim Robinson View Post
    I pulled this from a previous post:
    "Appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457mm) above the floor in garages. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate with a private garage through openings shall be considered to be part of the garage." M1307.3 of the 2006 IRC mechanical code

    The setup was a garage and shop. The shop is in the back of the garage, separated by a self closing door, but on the same level as the garage. There is a solid wall between the shop and garage, with just the door. There is a wall furnace in the back shop, with the burners 10" from the floor.

    Since this is directly accessible from the garage, should this furnace have been installed higher so that the burners were at least 18" from the floor. You can't drive into the shop, it's a wood shop only. Also, we are under the IMC for plumbing in our state, if it makes any difference.
    JR: Yes.


  3. #3
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    Default Re: furnace in attached shop

    I would have to concur.

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  4. #4
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    Default Re: furnace in attached shop

    Quote Originally Posted by A.D. Miller View Post
    JR: Yes.
    Quote Originally Posted by Gunnar Alquist View Post
    I would have to concur.
    Correct.

    Jerry Peck, Construction / Litigation Consultant
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  5. #5
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    Default Re: furnace in attached shop

    That's what I thought. Noted and sent. Thank's, y'all.

    Jim Robinson
    New Mexico, USA

  6. #6
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    Default Re: furnace in attached shop

    Sticking my neck out here but I would have to disagree with everyone else IF, there is a proper fire wall, fire door, no vents between the shop and garage. If all these were adequate then there should be no difference between a shop sharing a garage slab than a slab on grade house sharing a garage slab.

    I've inspected model homes where the builder had made one stall an office, complete with it's own furnace set on the floor in a utility closet. The word I received from the local building official was as long as there was a fire barrier the space was no longer considered a garage, but living space.

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  7. #7
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: furnace in attached shop

    Quote Originally Posted by Ken Rowe View Post
    Sticking my neck out here but I would have to disagree with everyone else IF, there is a proper fire wall, fire door, no vents between the shop and garage. If all these were adequate then there should be no difference between a shop sharing a garage slab than a slab on grade house sharing a garage slab.

    I've inspected model homes where the builder had made one stall an office, complete with it's own furnace set on the floor in a utility closet. The word I received from the local building official was as long as there was a fire barrier the space was no longer considered a garage, but living space.
    KR: Maybe life is running on a different set of tracks where you live. In the real world, at least in the United States, residential builders do not build "fire walls" and do not install "fire doors" in homes. But hey, that's just reality, and not the place where you were willing to stick your neck out, right?


  8. #8
    Ron Bibler's Avatar
    Ron Bibler Guest

    Default Re: furnace in attached shop

    Quote Originally Posted by Ken Rowe View Post
    Sticking my neck out here but I would have to disagree with everyone else IF, there is a proper fire wall, fire door, no vents between the shop and garage. If all these were adequate then there should be no difference between a shop sharing a garage slab than a slab on grade house sharing a garage slab.

    I've inspected model homes where the builder had made one stall an office, complete with it's own furnace set on the floor in a utility closet. The word I received from the local building official was as long as there was a fire barrier the space was no longer considered a garage, but living space.
    Is it part of an attached living space? No That makes it like an attached garage/shop/shed.

    Best

    Ron


  9. #9
    Ted Menelly's Avatar
    Ted Menelly Guest

    Default Re: furnace in attached shop

    Quote Originally Posted by Jim Robinson View Post
    I pulled this from a previous post:
    "Appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457mm) above the floor in garages. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate with a private garage through openings shall be considered to be part of the garage." M1307.3 of the 2006 IRC mechanical code

    The setup was a garage and shop. The shop is in the back of the garage, separated by a self closing door, but on the same level as the garage. There is a solid wall between the shop and garage, with just the door. There is a wall furnace in the back shop, with the burners 10" from the floor.

    Since this is directly accessible from the garage, should this furnace have been installed higher so that the burners were at least 18" from the floor. You can't drive into the shop, it's a wood shop only. Also, we are under the IMC for plumbing in our state, if it makes any difference.
    The highlight pretty much tells all. I guess the only difference would be a hobby room in the home off of the garage with the same seperation wall and solid core door with weather stripping that is the norm between the home and garage. Hobby room meaning not a wood working shop that could actually be considered part of the home even if it had its own HVAC set up.


  10. #10
    David Bell's Avatar
    David Bell Guest

    Default Re: furnace in attached shop

    This is from 2003 IMC section 304.3 commentary;
    An appliance installed in a closet or room that is only accessible from the garage must be considered as part of the garage for application of this section. Even though the room may be separated from the garage by walls and a door, there is no practical means of making the door vapor tight nor is there any assurance the door will remain closed during normal use.


  11. #11
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    Default Re: furnace in attached shop

    Quote Originally Posted by Ted Menelly View Post
    The highlight pretty much tells all. I guess the only difference would be a hobby room in the home off of the garage with the same seperation wall and solid core door with weather stripping that is the norm between the home and garage. Hobby room meaning not a wood working shop that could actually be considered part of the home even if it had its own HVAC set up.
    I think that's it Ted. Where a "hobby room" or even an office built inside the garage would meet the definition of "living space" a wood working shop would not. Probably why the local jurisdiction passed the home I was talking about.

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  12. #12
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    Frankfort, KY
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    Default Re: furnace in attached shop

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  13. #13
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    Nov 2009
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    Winston-Salem, NC
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    Default Re: furnace in attached shop

    From the ones I've seen here they have to be 18" off the floor.


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