|
Post by satamax on Oct 26, 2014 12:00:04 GMT -8
Hi everybody! Well, in the future, i would like to make a few heaters with bells. Problem is, what do i choose for the sides and tops? Below, i will use air entrained concrete for one of thoses. As well as at the back against the wall, so i don't loose too much heat to the great outdoors. I quite like the Gard stone and bricks traditional french style. I'm just wondering how do i hold the bricks on top for example. Make a concrete slab, steel reinforced and cover with bricks? Or use some kind of fiber in the concrete? Do i do a double wall bell? I should admit, i don't know much about expansion and contraction of materials under heating conditions. The first bell will be metal for sure! With may be exposed faces, may be dry stacked materials around it. Nothing is decided yet.
|
|
|
Post by Daryl on Oct 26, 2014 19:28:48 GMT -8
That looks sweet! Love the style, man.
|
|
|
Post by pinhead on Oct 27, 2014 6:03:58 GMT -8
I've wondered the same thing - how do you make a brick ceiling?
|
|
|
Post by Daryl on Oct 27, 2014 6:37:19 GMT -8
A brick ceiling? Not sure how Peter and Robert build their ceilings. A professional brick layer or someone with experience will need to answer that.
I have seen angle irons used for outdoor ceilings on stoves and angle irons are what I use. On the outdoor stoves, the builders have covered/included the metal in the mortar. I pick mine up over at Lowe's. I posted an Easy Outdoor Brick Stove video down on the Other Stoves forum. He uses a similar metal beam setup.
|
|
|
Post by patamos on Oct 27, 2014 8:21:44 GMT -8
I remember reading somewhere in these threads that concrete (with regular portland cement) tends to crack when temperature shifts more than 5c in one minute. So probably not the best material for top of a bell. It is not the peak temperature that matters, but the rate at which it changes/cycles. In one of Robert's threads (bell with oven), folks suggest that any bell brick work above the heat riser be firebrick. For the top, many of the companies that manufacture firebrick and refractory materials also make larger brick slabs, 12" x 24" x 3" and the like. Here in west coast canada they cost about $25 a piece. There could be larger ones to act as lintels over larger spans.
I'm just now finishing a cob shroud with fiberglass mesh laid up over top of a plywood mould/form. Could be some promise there.
|
|
|
Post by patamos on Oct 29, 2014 19:52:00 GMT -8
Further pondering those pictures, i wonder what configuration of steel, brick and mortar would be most effective?
|
|
|
Post by Benoit (Pyrophile) on Nov 1, 2014 2:56:11 GMT -8
Hi Satamax! The easyest may to cap the refractory part is to use large refractory plates, for example 50x30x6cm or 60x30x6. A few refractory bricks factories propose them.In France, you can find them in Alsace or south of France, like PRSE (Produits Refractaires du Sud-Est) or Tellus, etc. French dealers for specific materials dedicated to mass stoves like "Coeur de foyer" in Bourgogne sell them. It depends a lot of the distance between walls to cross/step over (franchir). I also use normal refractory bricks if I can (thanks to columns in the center of the bell, for example). Then I usually put insulation. Then different techniques can be used to cap the non-refractory walls, like concrete plates or slabs. 50x50 or 100x40cm can be found in any building store. You also can use flat metal bars on which you set your plates. I also use gypsum plates (carreaux de platre, 50x60cm.
|
|