Chimney top design

Chimney top design

PostBy: Townsend On: Tue Nov 08, 2011 1:15 pm

I have a older house built in 1851. I am not the original owner. It has three brick chimneys. A large main chimney with three flues and two single flue chimneys.

One of the single stacks, the unused one, was likely used for a kitchen cook stove and has not been in service since I have been here (12 years). The other single stack is currently being used with my Hitzer 50-93 and works fine as far as draft is concerned.

The single chimney that is unused was not finished off on top with a cap and has only a wooden cap that was put on to keep out the weather. The other two chimneys each have a built up brick support columns which support a slate cap. Those two chimneys are open on only two sides in that the brick is built up as a solid wall on two sides and an open section on the other two sides.

The question I have is I am in the process of building a brick and slate cap for the single chimney that was cap less. I was going to only build up the corners with support bricks thus leaving four sides of the chimney free to breath for draft. I got thinking of my two chimneys built by the old timers and wondered if there was a reason that they designed them with only two sides open for draft. Seeing that I was always day dreaming during school, especially during Bernoullie's principle of fluid dynamics, I am left wondering if I should rethink my design of the cap. Does anyone have any knowledge of this situation? Is the issue minor either way? Albeit I probably will not be using said chimney I'd still like to build it proper. It is not too late for me to add bricks if need be before I place the cap on.

A bit more, both of the chimneys that already have caps are not the same in so far as which sides are open to draft; i.e. the single has an east/west opening while the large main has its south/north side open.

Thanks

P.S. The 'original owner' comment was intended for humor. Hope you caught it.
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Townsend
 
Stoker Coal Boiler: Axeman Anderson 260
Coal Size/Type: Pea / Buck

Re: Chimney top design

PostBy: Rob R. On: Tue Nov 08, 2011 2:02 pm

Townsend wrote:A bit more, both of the chimneys that already have caps are not the same in so far as which sides are open to draft; i.e. the single has an east/west opening while the large main has its south/north side open.


My first thought was that they did it that way due to the prevailing winds and potential for a downdraft...but your last comment shot that theory to pieces. I think the chimney will draft fine with either design, so the choice is yours.

Maybe I'm being picky, but if it were my decision I would try to match the original brick color and replicate the cap style on the other chimneys.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Chimney top design

PostBy: steamup On: Tue Nov 08, 2011 2:06 pm

More open area, the better. Caps are strictly to keep rain out. If nothing more, they impede draft. No design that I know of improves draft. You cannot rely on winds for draft.
steamup
 
Stoker Coal Boiler: Axeman-Anderson AA-130, Keystoker K-6
Hand Fed Coal Boiler: HS Tarm 502 Wood/Coal/Oil
Coal Size/Type: pea, buck, rice


Re: Chimney top design

PostBy: Rob R. On: Tue Nov 08, 2011 2:19 pm

Here is a picture of the 3-flue chimney on my grandfather's house...must have been put up by the same mason. :roll:

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Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Chimney top design

PostBy: Den034071 On: Tue Nov 08, 2011 2:38 pm

Townsend, I'm from coal country, coaldale PA. I'm a mason 41 years. Put a slate cap on your raised corners. Let four sides open for draft. That'l do it. Any more questions pm me. Den
Den034071
 
Hand Fed Coal Stove: Hitzer, 3095

Re: Chimney top design

PostBy: freetown fred On: Tue Nov 08, 2011 4:18 pm

I got it. :clap: toothy I've put my share of chimneys up & my suggestion would also be to just lay the slate on the 4 corner bricks. If anything gets screwy, you can always brick up 2 sides at a later date--I suspect that that situation will not arise. ;) Not a bad pointing job my friend.
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix

Re: Chimney top design

PostBy: Townsend On: Tue Nov 08, 2011 6:30 pm

Thank you all for the replies. I am keeping it open on four sides.

Rob, I did try to match it as best I could but I was going on memory. I agree that the photo looks odd and the bricks are a bit lighter in color. But, I think that shot was not the best representation. Not sure if it was early morning light combined with mortar residue etc. Here is a shot from the ground where most views will occur. I don't feel like redoing it so it'll stay that way.

I appreciate all the replies gentlemen.
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Townsend
 
Stoker Coal Boiler: Axeman Anderson 260
Coal Size/Type: Pea / Buck

Re: Chimney top design

PostBy: McGiever On: Wed Nov 09, 2011 12:16 am

Townsend wrote:I have a older house built in 1851. I am not the original owner.


I caught that. :rofl: Good one :roll2:
McGiever
 
Stoker Coal Boiler: AXEMAN-ANDERSON 130 "1959"
Hot Air Coal Stoker Stove: HARMAN MAGNUM
Hand Fed Coal Stove: RADIANT HOME AIR BLAST
Baseburners & Antiques: OUR GLENWOOD 111 BASEBURNER "1908"
Coal Size/Type: PEA / ANTHRACITE, NUT-STOVE / ANTHRACITE
Other Heating: Ground Source Heat Pump
Stove/Furnace Make: Hydro Heat /Mega Tek

Re: Chimney top design

PostBy: jjs777_fzr On: Tue Nov 29, 2011 8:53 pm

McGiever wrote:
Townsend wrote:I have a older house built in 1851. I am not the original owner.


I caught that. :rofl: Good one :roll2:


I been up since midnight and I caught that too -

and the same mason did my parents house - open on two sides with cap
jjs777_fzr
 
Hand Fed Coal Stove: Penn Coal Stove & Chubby
Other Heating: CFM Wood Stove & Englander 25-PDVC Pellet Stove

Re: Chimney top design

PostBy: coaledsweat On: Tue Nov 29, 2011 9:28 pm

Townsend wrote:I have a older house built in 1851. I am not the original owner.

You fooled me with that avatar!
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: Chimney top design

PostBy: freetown fred On: Tue Nov 29, 2011 9:58 pm

geeezum, you New England guys--it took ya 21 days. :clap: toothy
freetown fred
 
Hand Fed Coal Stove: HITZER 50-93
Coal Size/Type: BLASCHAK Nut/Stove mix