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Outdoor Fireplace Question

 
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Old 10-30-2012, 06:35 PM   #21
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Re: Outdoor Fireplace Question


You only need 80 or so firebrick on edge and what maybe 120 if you lay them flat.

I think you would save yourself a lot of headache by prepping the footing and hiring a mason. It is foolish to think that you can mix mud and build a functional chimney and fireplace, let alone not have it look like an abortion.
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Old 10-30-2012, 06:57 PM   #22
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Re: Outdoor Fireplace Question


Refractory mortar is just that: Mortar. If you parge the inside with it, it will simply pop off. So, you have been given best practice, do what you want, because I for one do not give advice to those who only want to argue against that advice.

Good Day!
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Old 10-30-2012, 11:24 PM   #23
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Re: Outdoor Fireplace Question


I don't want to argue against that advice. I know what is the correct way to do things.


I live in Iceland the price here for firebrick for this fireplace is 1000$ that is to high for the budget

So I looked into other ides. I have been wondering about Iron sides, tiles, cement etc...


Everything to keep the cost down

I can cut the cost to less than 200 if I go with tiles


Firebricks are just so expensive sold at 4 dollars a pice's 4 by 8 inces


I will post photos of this project as it evolves
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Old 10-31-2012, 03:55 AM   #24
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Re: Outdoor Fireplace Question


What is the typical method of building a firebox in Iceland if not using firebrick?

If you did use tile, how would you adhere them? (i.e. what type of mortar would you use?)AND to what would you be adhering them? Simply adhering them to the concrete block would not work as the heat will transfer through and ultimately, as Tscarborough says, the blocks WILL fail.

Firebrick are expensive everywhere. That's just the cost of building a fireplace.
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Old 10-31-2012, 05:36 AM   #25
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Re: Outdoor Fireplace Question


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I don't want to argue against that advice. I know what is the correct way to do things.
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Old 10-31-2012, 07:04 AM   #26
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Re: Outdoor Fireplace Question


Quote:
Originally Posted by Geiri View Post
I don't want to argue against that advice. I know what is the correct way to do things.


I live in Iceland the price here for firebrick for this fireplace is 1000$ that is to high for the budget

So I looked into other ides. I have been wondering about Iron sides, tiles, cement etc...


Everything to keep the cost down

I can cut the cost to less than 200 if I go with tiles


Firebricks are just so expensive sold at 4 dollars a pice's 4 by 8 inces


I will post photos of this project as it evolves
You need 80 if you lay them on edge for a 36" firebox. Thats only $320.
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Old 10-31-2012, 06:40 PM   #27
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Re: Outdoor Fireplace Question


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You need 80 if you lay them on edge for a 36" firebox. Thats only $320.
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Old 11-13-2012, 08:07 PM   #28
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Re: Outdoor Fireplace Question


This is what this first Fireplace looks like. It is only stacked up no cementing yet..


All comments welcome this is a learning process

If you look inside the fireplace the roof is flat should I build it downwards in the front (1 or two 2 stoens) to keep the heat and smoke in the fireplace and allow the heat to stream more easily up the small chimney?

The back of the burn chamber tilts inwards to the fire and makes a smoke that is in parallel with the roof lower line.

Is it correct to think that the hotter the fire the more upstream and better exhaust in the chimney?
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Old 11-13-2012, 08:18 PM   #29
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Re: Outdoor Fireplace Question


That is fine until you put a fire in it. Line it with firebrick or watch it decompose quickly.
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Old 11-13-2012, 08:23 PM   #30
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Re: Outdoor Fireplace Question


Here is what you will have:

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Old 11-13-2012, 09:02 PM   #31
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Re: Outdoor Fireplace Question


I wouldn't worry too much about how the fireplace will draw. Unfortunately with outdoor fireplaces they are in an uncontrolled environment....outdoors. Wind acts in unpredictable ways and will cause even the best built fireplace to smoke on occasion. As T scar says tho, heat will ALWAYS cause concrete to deteriorate. You really NEED a fire resistant material in there so that the homeowner isn't pissing their money away.
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Old 11-13-2012, 09:15 PM   #32
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Re: Outdoor Fireplace Question


And FYI, that is after 2 (admittedly large) fires.
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Old 11-13-2012, 09:28 PM   #33
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Re: Outdoor Fireplace Question


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Originally Posted by Tscarborough View Post
And FYI, that is after 2 (admittedly large) fires.
must of used the wrong brand of glue!
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Old 11-14-2012, 09:42 AM   #34
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Re: Outdoor Fireplace Question


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That is fine until you put a fire in it. Line it with firebrick or watch it decompose quickly.
There will be some sort of fire shield in it, Fire brick or other.

I did light a small fire in it and I got some smoke coming out in the front .

I thought maybe I would have to but stones under the top in the front to make the fireplace build up more heat and increase heat flow through the chimney.
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Old 11-14-2012, 05:55 PM   #35
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Re: Outdoor Fireplace Question


The design that you have built is definitely not the best. Heat and smoke both like to roll, when they hit a square area they sort of bounce around in weird ways and usually come out the face. A box with an open face and a hole on top is not the best firebox but the real problem is the wind and more importantly the fact that you have the same pressure at the face of the firplace as at the top of the chimney since they are both outside. The reason a fireplace indoors doesn't smoke outside is that it's almost always warmer indoors (higher pressure) than outdoors on days that you would have a fire. Outdoors it's the same both places. You could try to extend the chimney to get a better draw but you will always have down draughts
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Old 11-14-2012, 07:11 PM   #36
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Re: Outdoor Fireplace Question


I will keep posting pictures as the project goes on. There is a throat and a smoke shelf in that fireplace ... I am thinking of lovering the opening at least one stone down. I might widen the throat opening a bit.

still a long way to go.. thank you for your advice and input guy's
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Old 11-14-2012, 08:26 PM   #37
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Re: Outdoor Fireplace Question


a smoke shelf won't do much in an out door FP. A smoke shelf does not do what count rumford thought it did, it does not "bounce" smoke back up the chimney but it does work as a restriction, creating a venturii effect increasing flow/velocity. However all that only works in a still environment. With wind going into the FP opening and down the chimney (especially a low chimney) there is a huge amount of turbulence. I think that making the opening smaller/lower is probably not a bad idea, it should help to keep the wind out and particularlyhelp to keep the wind from getting into the throat.
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Old 11-15-2012, 11:39 AM   #38
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Re: Outdoor Fireplace Question


I am still thinking of tiles inside the fireplace..

Maybe it's not going to work but I thought I would ask you guy's.

The idea is to build a Iron frame inside the fireplace spacing it 1" or 2" from the walls
Ether U shaped so you can slide the tiles in or L shape with a overlapping / Locking flat Iron welded or bolted in place to keep the tile secure..

In the space behind the tiles and Iron you could fill it up with none flamable glass whool to isolate the tiles from the stones...

Is this out of the question?
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Old 11-15-2012, 11:56 AM   #39
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Re: Outdoor Fireplace Question


I think you are working to hard to avoid the simple and obvious solution. I smell Homeowner.
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Old 11-15-2012, 12:19 PM   #40
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Re: Outdoor Fireplace Question


No just looking for alternatives to firebrick tho I might end up having to use them.

If I get an idea I try to stick with it and work in solutions and be creative. I just see how the tiles would look classier than the firebrick

The firebrick sold here is around 8.6 x 4 inches and only an 1" thick is that sufficient?

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