I have removed a hung chimney from my 1886 vitorian farm house. It had been footed on a wall on the first floor over a carrying beam. I plan to run a factory metal chimney for a wood stove in its place. My question is, that I would like to build a brick chase through the roof, near the ridge. The roof is 12/12 and the chase would be approximateley 16″ by 16″ and 5’6″ high. Can this kind of structure be properly supported in the attick? One side of a base could be supported on a load bearing wall, with the other side coming at an angle to the same place. Other suggestions include sandwiching the adjacent rafters and collar ties and supporting there, to sistering floor joists and suporting from there and the wall. If an attempt is made to distribute between rafters and the load wall or some combination, is it possble to determine that the load is actualy distributed? Is this all a bad idea? Thanks in advance. Eric.
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when we do this in an historic neighborhood, the history police just have to see brick, and it usually ends up being glue-on brick to a plywood box through the roof.
except once we did just what you described, but I forgot exactly how it was done, I think there was a plywood assembly which went from doubled ceiling joists through the roof to the top of the "chimney" and I distinctly remember a lot of 2 1/2 x 2 1/2 x 1/4" angle iron . The brick started at the rafters. It wasn't any 5 feet tall, though,. You should get yourself an architect to design it.
Eric,
I`m with Panama Red on this one. Have the load calculations worked up and get a drawing made. Always better safe than sorry. In such a litigious society, I leave little to my own discretion.
J. D. Reynolds
Home Improvements
"DO IT RIGHT, DO IT ONCE"
I heartily agree with the two previous posts. I have seen this done where brick angles were bolted horizintally to the framing slightly below the roof sheathing. Brick was layed on the angles to slightly above the sheathing where the flashing goes. I then flashed thru the brick to behind the housewrap on the chase and the rest of the brick was layed. The thru-flashing stops any moisture from wicking thru the masonry-it is forced to the outside.
I have also seen the detail where the brick angle is layed on the roof sheathing and bolted at an angle ( the roof pitch ) to the studs. In this case, ice and water membrane was installed under the angle and up onto the wall.
Again, check local codes and get this engineered before proceeding.
gl
Work hard, play hard, sleep hard, wear glasses if you need 'em.
Edited 4/23/2002 6:55:53 AM ET by grantlogan