Post by gregw on May 30, 2017 16:42:00 GMT
Hi,
I'm currently building a dome oven with a prefabricated oven www.lineavz.it/forni-a-legna-prefabbricati/pane-pizza-per-casa-esterno-giardino/1545-napoli For some extra degrees of difficulty I'm doing it in Italy (and my Italian could be better) and am building it 3 terraces down a steep slope where everything needs to be carried by hand - including the water (why am I building my oven there... it will be fine/fun... It's in an Olive/Cherry grove, plenty of wood, plus I don't have anywhere else I can do it)
I've got the table built and am about to assemble the dome, but need some advice about how to finish it. Well actually I'm getting lots and lots of advice from the locals, who of course have all built their own ovens from clay they dug by hand from their own back yards /s. But their advice is often contradictory or just impossible to understand or to follow or need materials that don't exist etc. So really I'm after a sanity check for what I'm about to do.
The table top was made from terracotta roof trusses with 4 cm of reinforced 4:1 concreate on top. The trusses (tavellone www.fbmagenti.it/appoggiosito/prodotti/materiali%20da%20muro/tavev/07_tavellone_rigato.jpg), have voids in them so should have some insulating properties.
On top of the table I'll put a layer of vermiculite (6:1 ?). Will 5cm be enough? I'd like to avoid carrying down the extra weight volume to carry down a 7cm or 10cm layer.
Once the dome is assembled, I have my first big conundrum - the instructions for the kit say just tie the pieces together with 4mm wire stables and the tongue/grove will do the rest, but the concern that has been voiced is that rock wool splinters might fall through the cracks. Others have told me I should fine some wonder silicon glue ( can't find it). So I'm thinking of just using refractory mortar to stick the pieces together and to well seal all the joints.
Then I'm think of finishing with 3cm of vermiculite then 10cm of rock wool, then wire mesh and finally just 2-3cm of normal waterproof flexible render. Here there is also some contrary advice that I should put the rock wool on first, then the vermiculite and then the render. Will it make any big difference the order of the insulating layers? I thinking vermiculite first as many ovens just have that, then the rock wool is bonus and the render is just to keep it all dry (will put a roof on as well).
Also I'm thinking that the rock wool will go around the outside of the vermiculite base, rather than build the base out from under the oven and have the rock wool finish on top of it. Does that make sense?
cheers
