Rigar wrote:Judging by the last 2 pics...others may argue its ability...but your chimney appears to be to code (of when the house was built)....and may work fine (or not even be improved upon by extending its heigth)...depending on the prevailing winds there
Berlin wrote:Irrelevent to moving the thimble, but, I'm surprised that you get any kind of decent performance at all out of that stack. An exterior chimney which is too short for the roof it's above let alone the house. A proper stack, which will maintain draft during mild weather, and draft strongly during cold weather would terminate at least a few feet higher than the highest part of the home - that one doesn't come close.
dcrane wrote:The more major concern i have with this Chimney is that upper roofline (as others have sayed), although it is far enough away to "get away" with it, this is a much more major flaw then your thimble location and the performance of anything and everything you burn in that chimney is effected (even though you dont realize it).
Yeah, 28 years ago, I was a total newbie at anything construction-related, and figured "a chimney is a chimney, and the builder knows how to build one."
My father-in-law did the plumbing and electrical for us--he had much experience with oil and gas heating systems, so I'm sure he knew a bit about chimneys, but he didn't expressed any concern as he saw ours going up. I think Rigar's right--the chimney likely met code back then--but just barely. I was sorta shocked when, several years later, I began reading up on chimneys and saw the general guidelines for chimney construction, esp. re. being taller than the 2nd floor roof.
But, we've burned both our F-B and the DS through some pretty warm, damp, zero-wind days with temps in the high 50s, and haven't had problems. I'm careful, though, to open the MPD a bit more to let more hot gas up the flue, which I think helps avoid draft issues. The one issue I do have, which may be partly due to the lack of height, is that when the chimney is cold, and there's little to no wind, it strongly downdrafts. If I'm lighting the stove on a day like that, I always warm the flue first with a hairdryer. That's another reason I'd like to have a baro, that's where I used to insert the hair dryer nozzle.
Two things probably help the draft when the stove's burning: the front of the house faces almost due north, and winds are usually from w/nw so they're seldom sweeping over the 2nd floor roof toward the chimney--though we occasionally do get ne/e/se winds during coastal storms, where the winds swing around as the storm passes. But even that's never caused an issue while we've been burning.
Also, the chimney is 24 feet from the two-story part of the house.
I do plan on getting rid of that tall evergreen near the chimney this summer--that could cause issues as it gets taller. Besides, it's starting to interfere with the coal truck backing in to deliver, so it's gotta go.
Btw, that other flue for the fireplace has never been used. I told my wife when we moved in, I wouldn't build a fire in it until we got glass doors, and she's never found a set of glass doors she felt looked "colonial enough" to install. Classic hubby/wife impasse.
That fireplace is as clean inside as the day we moved in.