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Hi All
I reread the thread on things people would do differently and there are three elements would like to avoid with a plan I have. Now the challenge is to explain my plan in such a way that you will understand. :-) Let me try:
The first two issues has to do with isolating the chimney and starting with a wider chimney. (As I have tried to explain with pics, the numbers speak to the attachment).
1. This shows the footprint of the 42? oven as standard but with the footprint of two extra pillars of normal brick biult on either side.
2. Shows how I plan to put lintels on top of the pillars which will thus carry the chimney.
3. Shows the gap which will now be between the inner arch & oven and the pillars on the sides as well as at the top the gap between inner arch and the raised chimney.
4. If I now box the area and ?cast? normal 5:1 vermiculite in this gap as well as around the oven I believe my chimney will be insulated and I will have a wide (and flat) surface on the lintels to gradually taper the chimney entrance.
5. As a consequence and as this cutaway down the centre of the oven (side view from the middle line) shows, there will be and area of open vermiculite mix visible at the deep end of the entrance ?throat? before the inner arch
Questions are if this will work and secondly what kind of temperatures could be expected at the outside of the vermiculite "strip", because if not too hot, I could clad the vermiculite strip with a thin stainless steel plate (if the bare vermiculite looks bad)?
The third issue is the two doors thing. If the temp on the outside of this vermiculite strip (at the start of the outer throat) is low enough, I can build a sliding door (steel plate) frame (u channel) in-between the throat wall and the outer vermiculite into which a draft door can work as vertical sliding door. A stopper peg could ensure I leave draft space at the bottom.
Thoughts? (...and thanks )
Kind regards
Dolf
I reread the thread on things people would do differently and there are three elements would like to avoid with a plan I have. Now the challenge is to explain my plan in such a way that you will understand. :-) Let me try:
The first two issues has to do with isolating the chimney and starting with a wider chimney. (As I have tried to explain with pics, the numbers speak to the attachment).
1. This shows the footprint of the 42? oven as standard but with the footprint of two extra pillars of normal brick biult on either side.
2. Shows how I plan to put lintels on top of the pillars which will thus carry the chimney.
3. Shows the gap which will now be between the inner arch & oven and the pillars on the sides as well as at the top the gap between inner arch and the raised chimney.
4. If I now box the area and ?cast? normal 5:1 vermiculite in this gap as well as around the oven I believe my chimney will be insulated and I will have a wide (and flat) surface on the lintels to gradually taper the chimney entrance.
5. As a consequence and as this cutaway down the centre of the oven (side view from the middle line) shows, there will be and area of open vermiculite mix visible at the deep end of the entrance ?throat? before the inner arch
Questions are if this will work and secondly what kind of temperatures could be expected at the outside of the vermiculite "strip", because if not too hot, I could clad the vermiculite strip with a thin stainless steel plate (if the bare vermiculite looks bad)?
The third issue is the two doors thing. If the temp on the outside of this vermiculite strip (at the start of the outer throat) is low enough, I can build a sliding door (steel plate) frame (u channel) in-between the throat wall and the outer vermiculite into which a draft door can work as vertical sliding door. A stopper peg could ensure I leave draft space at the bottom.
Thoughts? (...and thanks )
Kind regards
Dolf
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