Chimney of 1855 two story house with basemant
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sparky1



Joined: 10 Feb 2007
Posts: 1

PostPosted: Sat Feb 10, 2007 10:22 pm    Post subject: Chimney of 1855 two story house with basemant Reply with quote

My brick home built in 1855 has two brick chimneys. The one being used now as the oil furnace flu is offset (appears to be leaning to the left) from perpendicular either by design or by structural failure by about 10 inches or so. It then appears to resume perpendicular before it exist the roof. This is evident only as seen in the attic. From the cellar and up to the attic it appears to be on perpendicular until just above the attic floor then where it appears to be leaning to the left and the bricks appear to be offset again either by design or failure thru settling or shifting. There appears to be some disintegration of some of the mortor around some of the bricks as well. The odd thing about this too is that the exit hole in the roof ridge for the chimney does not line up with the hole in the attic floor where the chimney comes from below by about the same distance that the chimney is off perpendicular. When viewed from the exterior, from the ground, there is no visible evidence that the chimney leans inside the attic. Does anyone have a clue. Thanks.[/u][/b]
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johnleeke
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Joined: 20 Aug 2004
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Location: Portland, Maine, USA

PostPosted: Sun Feb 11, 2007 7:59 am    Post subject: Reply with quote

While not common, an offset like this has been standard practice for centuries, and is still sometimes used today.

Since this chimney is in active service and you note deterioration, it's condition should be assessed by a competent mason and any needed repairs or maintenance should be done.

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oldhomeowner



Joined: 04 Oct 2006
Posts: 55
Location: albany NY

PostPosted: Tue Feb 13, 2007 8:11 pm    Post subject: Reply with quote

Quote:
while not common, an offset like this has been standard practie for centuries, and is still sometimes used today.


What is the purpose of the offset?
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johnleeke
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Location: Portland, Maine, USA

PostPosted: Tue Feb 13, 2007 9:12 pm    Post subject: Reply with quote

Usually, the purpose is to bring the chimney through the roof at the peak of the roof. If the chimney is down the slope of the roof, water may collect and leak in at the up-slope side of the roof, unless you also build a "cricket" to drain that water to the side of the chimney, which is a complication that can be avoided by laying up the chimney with an offset.

An offset may also be used to get around structural timbers or other framing members.

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