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Post by pizzapaul on Jun 23, 2020 9:35:03 GMT
A 5" diam chimney is ok for ovens up to 600mm diameter. A 750mm diamanté's definitely needs a 4"flue unless you don't mind smoke issues. Hi Dave, Just to be clear, the 750 Milano comes with 5" option. I was going to swap for 5" stainless instead of the black enamel (the mention of 4" on my old oven was confusing!!) Can you clarify what you are saying for the 750? Mention of diamenté and 4"flue is auto-correct gone mad?? Thanks
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Post by trickedem on Jun 24, 2020 11:27:04 GMT
Next is the brick arch, and then the big decision - bricks or render! Have you started your arch yet? I had a few issues with mine and in the end I needed to rebuild it TWICE! I was using engineering bricks, but I hadn't made the mix strong enough and it hadn't stuck properly. Take a look at my build log to see how I fixed this
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Post by pizzapaul on Jun 24, 2020 16:01:02 GMT
Just posted on your thread - I had exactly the same issue!! I am redoing tomorrow with a stronger mix and filling in that gap as I go this time.
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Post by pizzapaul on Jun 26, 2020 10:43:04 GMT
Had to do the arch twice. First attempt far too weak. Second attempt - Soaked all bricks overnight in a huge bucket - Used 4:1 to go a little stronger - Used a much more secure template (wider/stronger) - Filled the gap between arch and dome as I went - yes I expect that will crack due to expansion but the structure is very stable now
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Post by pizzapaul on Jun 26, 2020 11:00:05 GMT
Render.
What recipes do people recommend for the final render over the insulation blanket. Does it need vermiculite just to add a little more insulation? (You can never have too much insulation!)
Most recipes seem to recommend plasterers sand whereas I have several bags of builders sand left over - can I use that? I will be painting it when finished and would prefer a 'rustic' appearance? Can the final render be regarded as weatherproof for the winter, or will it still need to be covered?
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Post by pizzapaul on Jun 26, 2020 11:01:28 GMT
Seeing you asked, a 5" diam.flue pipe is ok for ovens up to 600mm diameter. A 750mm diameter oven definitely needs a 6" flue IMO, unless you don't mind smoke issues. Thanks for the reply. I will watch the smoke situation and see if I need to retrofit a 6" flue. Anyone else already enlarged the 750 Milano to a 6"?
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Post by truckcab79 on Jun 26, 2020 16:55:46 GMT
The supplied 5” works perfectly with mine. No smoke out the front after initial lighting. Maybe a minute max. After that it draws brilliantly. I had talked in the past about popping on an adapter and a 6” (I’ve made my flue removable so no effort to do so), but it works so well I’ve never got round to it.
i forget who but if you search the other 750 builds I’m sure that someone recently did this. You can either add an adapter to the casting and then your 6” or enlarge the casting. Personally I’d avoid the latter even though it means you are still restricted by the flue being at 5” at that point regardless of the rest of the flue.
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Post by webbm00 on Jun 27, 2020 21:52:19 GMT
Seeing you asked, a 5" diam.flue pipe is ok for ovens up to 600mm diameter. A 750mm diameter oven definitely needs a 6" flue IMO, unless you don't mind smoke issues. Thanks for the reply. I will watch the smoke situation and see if I need to retrofit a 6" flue. Anyone else already enlarged the 750 Milano to a 6"? I did it in my build (see signature). It was easy to do I just drilled and chiselled out the flue hole so that the 6" flue fitted and then tidied it up with fire cement
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Post by pizzapaul on Jun 30, 2020 6:44:08 GMT
Re-did the arch. Soaked bricks overnight, 4:1 mortar, filled the gap with mortar as I built. Couple of firings to keep it all dry. Aluminium foil layer. I read the debates about this but I had already bought it so went ahead as planned. Next the insulation. The plans from Pizza Oven Supplies definitely don't work - they must be for an old design. Easy enough to correct. Finally the membrane. What a fiddle to lay a square piece of material over a dome. Plenty of strategic folds.
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Post by pizzapaul on Jun 30, 2020 9:12:05 GMT
Chicken wire done. Twisted to tighten it up. Now, render or brick? Going for brick!!
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Post by downunderdave on Jun 30, 2020 20:09:05 GMT
I covered my oven with foil prior to rendering the outer shell, but was worried about trapped moisture, so I perforated the foil in two places about 10cm2 each.Now when the insulation space gets damp after heavy rain or extended humid weather, when I fire the oven it gets hot to touch the outer shell in the places where the foil is perforated, while the rest of the oven is only warm to the touch. This is indicative of steam passing through the foil at those places so I now no longer use foil in subsequent ovens I build and wish I hadn't in mine as it slows down drying. I know the manufacturer recommends foil over the blanket, primarily to prevent the moisture from the render being drawn out by the blanket, but the foil layer also prevents the passage of moisture. This is fine to prevent water getting through to the inner dome, but it also prevents water getting out. A solution to this problem is to use perforated foil, so if it is not already perforated you can hammer some nails into a length of wood so they protrude a few millimetres, then slap the thing silly with it. As aluminium is highly conductive, if it is in direct contact with the outer rendered shell it will not have any positive effect in insulating because whilst it may reflect some heat back in it also acts to conduct heat back out.[/quote]
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Post by pizzapaul on Aug 17, 2020 6:01:08 GMT
Finally finished it all a few weeks ago so here are the final pictures to show the end! Don't judge me on my brick laying, I am happier with computers and a keyboard, and we decided we wanted a rustic outdoor finish :-) Note I have left the chimney section deliberately as the family all preferred the "industrial" look Used it several times and it all works brilliantly. A little smoke for a minute or two when first lit but then draws faultlessly.
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Post by truckcab79 on Aug 21, 2020 12:22:24 GMT
Nothing wrong with your brickwork. Looks fine to me. That front section is really fiddly I found. Best to ignore the instructions and decide on the best solution for you. I personally didn’t like the way the photos on POS show the brick chimney finished as to me the bricks look like they are going the wrong way (sort of up and over the dome rather than round. I carried mine around the chimney as a continuation of the dome. No right or wrong way of doing it though. Nicer that they are all different I think.
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