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Old 04-08-2010, 10:49 PM   #1
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Prefab gas fireplace


My wife wants a prefab gas fireplace. She wants it so the back of the fire place sticks out the back of the house so the front of the fireplace will be flush with the wall on the inside. Does the part that sticks out the back of the house need a foundation?

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Old 04-08-2010, 10:56 PM   #2
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Prefab gas fireplace


No, but you will need to extend your framing or bolt-on a set of brackets to hang the new framing from.
Framing would be like a bow or a bay window that jogs out from the wall.

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Old 04-08-2010, 11:06 PM   #3
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Prefab gas fireplace


OK so just basically I can build a box attached to the rim joist or studs to support the rear of the fireplace? I haven't received the fireplace yet. Will the fireplace have specs for the rough opening?
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Old 04-11-2010, 04:50 PM   #4
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Prefab gas fireplace


Yes, kind off, but that is a little over simplified. The cantilivered floor joists will have to carry weight, so they need to go back under the house and be sistered onto the existing joists, or headered off if their location is between two existing joists, they cannot just be nailed onto the outside of the rim joist.
Remember they have to carry the weight of the firebox, along with anywhere from 12' to 30' of vent pipe, plus the structure itself; framing, sheathing, and exterior claddding.
Yes the unit will come with all necessary dimensions you need for installation.
The firebox is supported by sitting on the floor, not by cantelievering it out on the nailing flange around the unit, as I think you may be suggesting. The sheet metal is very light gauge, and the fins are for holding the box in a steady position only, not for weight carrying.

Last edited by troubleseeker; 04-11-2010 at 04:57 PM.
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Old 04-11-2010, 04:57 PM   #5
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Prefab gas fireplace


rather than cantilivering, should I just have the block foundation bumped out to the specs of the fireplace?
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Old 04-12-2010, 09:53 PM   #6
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That is an option, but I think it would be considerably more expensive.
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Old 04-12-2010, 10:10 PM   #7
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Prefab gas fireplace


I think I will go with the cantalivering option. I am using tgi's and the floor joists do not go in the same direction so I will have to header off as you suggested. The type of gas fireplace we are using just exits out the back and will not need a chimney.
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Old 04-13-2010, 08:10 PM   #8
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OK, I have decided to have the mason build a bump out for the fireplace foundation as the fireplace will be flush with the interior walls. The fireplace is a GreenSmart 864 TRV. The installation manual says the rough framing for the with is 41 1/4" and the depth from the front edge of the framing to the rear of the fireplace is 20". These measurements include the 1/2 required clearance. I am framing using 2x6's. I am going to tell the mason to bump out the foundation 41 1/4 + an additional 6 inches on each side for the 2x6 framing bringing the width to 53 1/4 and for the depth 20 + 6 inches for the for a total of 26 inches. Can anyone confirm my measurements?
Here is the link for the installation instructions, page 12
http://www.avalonfirestyles.com/Trav...-01220_000.pdf


Last edited by taylor01; 04-13-2010 at 08:12 PM. Reason: add link
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