Two questions: 1. Did you ever consider putting a thermal blanket after the first layer of perlite, and then doing a second layer? 2. Did you let it cure for 10 weeks and then do your big fire with the pizza in the footage? Looks good! I think I'm going to give it a try myself
Cracks from improper mortor mix. Apply mortar in 1" layers and let completely dry each time. Thick layers and too wet mortar crack. Mortar should be peanut butter consistency. Work in cool moist weather, not hot sun.
@@michaelh2931 hello Michael, I have a perlite dome fail. Trifecta of the mistakes you mentioned. Perlite mix too wet, too thick and hot weather in indonesia. Also, no wet towels over during first week of cure. Trying again this week. What perlite /portland cement /water ratio would you suggest? I'm thinking 1in first layer. Chicken wire and then a second layer of perlite.
@@doctorfloydhayworth9080 use ratio of 5 perlite, 2 cement, water just to make it stick together when you squeeze it in your hand. Don’t use too much water. Try to use refractory cement if possible. Cover and seal well with plastic. Spray water as necessary to keep it moist while curing. Cure for 1 month. First fire to be small and do this over a few days, gradually increasing the fire and temperature.
Hallo, ik heb een aantal vragen: Welke maten heb je voor het hout van het grote blok gebruikt, of eerder gezegd waar heb je alle balken vandaag gehaald. Ook vroeg ik me af waar je de plaat vandaan heb die je hebt gebruikt voor het lage tafeltje waar de oven zelf in het begin op kwam te staan. Kun je niet ook gewoon het cement gebruiken als ondergrond van de oven, in plaats van de vuurvaste stenen te gebruiken? en dan gewoon een pizzaplaat erin leggen. Ik las dat je scheurtjes kreeg in de koepel, maar kun je dit niet tegen gaan door er een beschermende laag overheen te smeren? Alleen weet ik niet zo goed wat je daar voor kunt gebruiken. Als laatste, hoeveel kg denk je ongeveer dat alles bij elkaar zal zijn, moet ik denken aan 50, 100 of zelfs 150? Alvast Bedankt!
Hallo Wim, Balken bovenkant zijn ca. 15x5 cm, poten 10x10, dwarsliggers 5x5. Verkrijgbaar bij bouwmarkt of houthandel. De platen zijn zogenaamde Lewisplaten, verkrijgbaar bij de betere bouwmarkt. Deze tegels houden, bij mijn weten, hitte lang vast. Ik weet wat het effect van cement met pizza plaat is. Als ik de oven overnieuw zou gaan bouwen zou ik de koepel bewapenen zodat deze niet gaat scheuren. Ook zou ik hem langer laten uitharden. Ik denk eigenlijk dat het gehele gewicht wel richting 250 kilo gaat. gr, Luuk
beautiful job congratulations! I wanted to know the diameter of the ball and the size of the mouth !!! also how much you left of internal height !! thank you so much !!!
Marco most the exercise balls used for this are 65cm or larger. The height of the opening needs to be as close to 63% of the height of the dome as possible.
Whenever possible always cover concrete and try to keep it a little wet, especially in the first week. It'll cure more slowly therefore reaching a higher final strength than it otherwise would have.
Forno Bravo recommends cement and vermiculite for base insulation and then a layer or two of refractory brick. One layer of fire brick is sufficint on the base unless you want a lot more of thermal retention for longer cooking time.
Hello Luke I built a very similar oven using your video as a guide ( thank u very much). It is currently in week4 curing. It seems kind of fragile though? Did yours feel like you could crush it pretty easily? I used 5 parts perlite (loose fill masonry insulation), 1 part refractory cement and 1 part Portland cement. I'm worried it is not hard enough to withstand the heating. Thanks for your insight. Dan
Hi Dan, thanks for watching. You used 5/2, that should be good enough and strong enough. When the dome is cured long enough it should work i guess. Dont use it "full heat" first times. Keep me informed. Cheers
How many parts of cement did you use? Im trying to make one but i dont want to mix up too much and purchase to little perlite. The ball im using is 65cms
leuk project, misschien ga ik het ook ooit proberen. vraagje je hebt portland gebruikt, lees ik maar waarom heb je geen vuurbestendig cement gebruikt? of is dat niet nodig
Hallo, sorry voor de late reactie. De zelfde vraag heb ik ook gehad en niet echt antwoord op weten te vinden. Alles wat ik kon vinden op het web qua mix samenstelling werd portland in gebruikt.
Hallo, ik wilde weten welk cement ik moest gebruiken? normaal of ongevoelig? Hello, I wanted to know what cement to use? normal or refractory? Good video and good job !
Bij 0.42 lijkt de oven nog al "korrelig" en het eindresultaat is helemaal glad, heb je een laag met fijnere perlite korrels over de 1e laag gedaan? thanks voor de video!
Luuk Draaisma ah okay, ik heb mijn oven gesmeerd en hij heeft 1 dag gedroogd maar er vallen droge korrels af. Is het denk je slim om er een nieuwe laag met fijnere korrels op te smeren?
karbijnhaak Vierdeling hou hem maar nat met doeken en langzaam laten drogen. Echt wel 10 weken aanhouden. Die van mij heb ik verknalt omdat ik na 6 weken niet meer kon wachten.
This is a great project...good job! I am about to start planning my own build and I think that I will use your technique as my template. I just wanted to know if you have noticed any significant heat loss through the base (under the table). I ask because I noticed that you did not use insulating fireboard under the concrete/perlite slab nor the use of a fire blanket over the dome or firebricks for the cooking surface. Each would add significant heat retention. If you measure the heat around the exterior of the oven, at full fire temperature, it should not be more than 60 deg Celcius (140F). Do you achieve this? This information will help others to avoid a possible structural failure in the long run. Thanks for sharing!
+Francesco Guerriero hello Francesco thank you for watching my video. The temperature outside the oven is about 80 till 90°C at full fire. For pizza baking the bottom isolation is okay. The heat of the tiles are hot enough for baking pizza. I agree with that using fireblanket at the bottom would be better. Maybe I will do this to keep the temperature high. I am planning to rebuild the dome part because there are big cracks. When rebuilding I use two layers concrete with fireblanket and chickenwire between the layers .good luck !
If you are rebuilding, may I suggest you incorporate fireclay into your perlite mix so that your dome will withstand the rapid heating and cooling cycles without cracking. Please keep everyone posted as to your progress.....it's inspiring
@@luukdraaisma I think you might want to look into using "rutland refractory cement" and avoid Portland cement. Portland cement might be the reason its cracking. I also hear perlite might be the wrong thing to use. There is another product similar to it that can be used but I can't recall the name of it right now. Anyway, its a nice build. You could also go traditional and use adobe to make the top like they do for earthen ovens.
At this point in the video ruclips.net/video/rM-a1f7kF40/видео.html it looks like you added a skim coat to the outside, what did you use? Also I like your stand and want to do something similar, what did you put under the baseplate? Wood?
Lee Glasgow I made skim of Portland. It didn't survive winter, cracks all over the dome. I think I should have used some water resistant coating. I used timber under the baseplate.
Great videoGuys between you and JJ Grice I'm trying to build Mine soon when I get some days off lol. Let me ask you is it ok to mix Perlite with Stop heat Cement the one they use in chimney instead Portland Cement Let me know that cement can resist up to 2000F so I never used it before. Thank you
How is it working out? I mean any cracks major issues as not holding temperature? I am building one like this as we speak but plan on putting a ceramic fiber blanket over it an then Stucco it Great job by the way!!
+Maurizio Bussolino keeping the heat in the oven is no issue. Cracks yep! Big ones appeared. Planning to rebuild the dome part and make it two layered, also with fiber blanket.
Cosider using a sand mold instead of a ball. Apply mortar in 1" layersvandvallow each layer to thououghly dry. Apply fine mesh wire on second layer. Use thermal blanket material just before final layer.
Looks great! I was wanting to make one of these as well. What size timber did you use for the stand? What is the metal on the base supporting the concrete?
Of course it did. Better to buildvthe igloo on top of moist sand mold and cover the whole thing in wet blanket and plastic for curing. The bottom and top need to remain moist during curing, at least for a few days.
Yes, I built my oven 2 layers, inside layer as described, outside layer is a cement render with AR fibreglass, with hi density insulation (suitable for kilns) between the 2 layers The insulation is covered with aluminium foil and chicken wire to make the top layer bond The reasons for this is 1. the single layer by itself allowed too much heat through, heat loss = waste, reduced temp, cools off too quick 2. the first layer cracked around the chimney The two layers bond around the opening (i left about 4 inches), the chimney and the base edge ( about 2 inches) I did not add fibreglass to the first layer, but cant see any reason it will react to heat It is amazingly strong, easy to work with, and you dont need much - I used 1/2 kg for a wheelbarrow load
How does it hold in time? Any cracks from the heat?
nice build!!!
It looks excellent. What is the outside cowering?
ThanksJakob. Portland cement.
Two questions:
1. Did you ever consider putting a thermal blanket after the first layer of perlite, and then doing a second layer?
2. Did you let it cure for 10 weeks and then do your big fire with the pizza in the footage?
Looks good! I think I'm going to give it a try myself
Cracks from improper mortor mix. Apply mortar in 1" layers and let completely dry each time. Thick layers and too wet mortar crack. Mortar should be peanut butter consistency. Work in cool moist weather, not hot sun.
@@michaelh2931 hello Michael, I have a perlite dome fail. Trifecta of the mistakes you mentioned. Perlite mix too wet, too thick and hot weather in indonesia. Also, no wet towels over during first week of cure. Trying again this week. What perlite /portland cement /water ratio would you suggest? I'm thinking 1in first layer. Chicken wire and then a second layer of perlite.
@@doctorfloydhayworth9080 use ratio of 5 perlite, 2 cement, water just to make it stick together when you squeeze it in your hand. Don’t use too much water. Try to use refractory cement if possible. Cover and seal well with plastic. Spray water as necessary to keep it moist while curing. Cure for 1 month. First fire to be small and do this over a few days, gradually increasing the fire and temperature.
@@doctorfloydhayworth9080 Use chicken wire. Make it maybe 3cm then chicken wire then another 3cm.
What size is the ball?
Does it really take 10 weeks for the perlite and cement mixture to cure? What if you added more cement do you think that it will crack when heated?
depends on the air humidity. i didnt use any reinforcementm thats why it cracked
is it possible to bake bread because there is no heat mass in this oven? can it hold lower temperatures like 200-300°C for a while?
for baking bread the insulation is not good enough.
Mooi gedaan man, lijkt me een leuk project voor volgende zomer. Bedankt voor het delen.
Great job!
And the pizza looks perfect.
Do you use regular cement on the sides of the refectory tile.?
Hallo, ik heb een aantal vragen:
Welke maten heb je voor het hout van het grote blok gebruikt, of eerder gezegd waar heb je alle balken vandaag gehaald. Ook vroeg ik me af waar je de plaat vandaan heb die je hebt gebruikt voor het lage tafeltje waar de oven zelf in het begin op kwam te staan.
Kun je niet ook gewoon het cement gebruiken als ondergrond van de oven, in plaats van de vuurvaste stenen te gebruiken? en dan gewoon een pizzaplaat erin leggen.
Ik las dat je scheurtjes kreeg in de koepel, maar kun je dit niet tegen gaan door er een beschermende laag overheen te smeren? Alleen weet ik niet zo goed wat je daar voor kunt gebruiken.
Als laatste, hoeveel kg denk je ongeveer dat alles bij elkaar zal zijn, moet ik denken aan 50, 100 of zelfs 150?
Alvast Bedankt!
Hallo Wim,
Balken bovenkant zijn ca. 15x5 cm, poten 10x10, dwarsliggers 5x5. Verkrijgbaar bij bouwmarkt of houthandel.
De platen zijn zogenaamde Lewisplaten, verkrijgbaar bij de betere bouwmarkt.
Deze tegels houden, bij mijn weten, hitte lang vast. Ik weet wat het effect van cement met pizza plaat is.
Als ik de oven overnieuw zou gaan bouwen zou ik de koepel bewapenen zodat deze niet gaat scheuren.
Ook zou ik hem langer laten uitharden.
Ik denk eigenlijk dat het gehele gewicht wel richting 250 kilo gaat.
gr, Luuk
beautiful job congratulations! I wanted to know the diameter of the ball and the size of the mouth !!! also how much you left of internal height !! thank you so much !!!
Marco most the exercise balls used for this are 65cm or larger. The height of the opening needs to be as close to 63% of the height of the dome as possible.
Dome 85 cm, mouth 40 cm
Thinking of using the perlite&concrete mix as the hearth base instead of the tiles, do you think it would retain enough heat? Thanks
+samanthacraze Thanks for watching! i reccomend tiles or bricks, I think the surface is smoother.
Luuk Draaisma Any idea how much it weighs? did you end up making a door for it? thanks again!
Tile is okay if you use a pizza stone...butbthen you may as well useba conventional oven.
How much perlite did you used for the Dome?? Thanks and GREAT VIDEO!
dont know excatly, 100 liter perlite, 25 kg portland
Hello ☺️ what is the max temperature? How much is the cooling / heating time aprox please ?
aprox. 550 degrees celsius
Whenever possible always cover concrete and try to keep it a little wet, especially in the first week. It'll cure more slowly therefore reaching a higher final strength than it otherwise would have.
5.5 years later and does it still work? Has it cracked?
yes it cracked, but still works great.
Having trouble finding Pertite with the chunks in it. I found really fine perlite, like sand consistancy.... Help please...
how does the oven outside look so smoth?
plastered the dome.
Hi Luke! Did you find it hard to get an even thickness around the dome? Can you suggest any tips on keeping it the same thickness all the way round?
Thanks for watching. i used a trowel with 2 inch width. the 2 inches is the thickness of the dome. You can use the trowel as build guide
Forno Bravo recommends cement and vermiculite for base insulation and then a layer or two of refractory brick. One layer of fire brick is sufficint on the base unless you want a lot more of thermal retention for longer cooking time.
great job. i wish i saw this before I made mine. mine is ok but not as nice
Hello Luke
I built a very similar oven using your video as a guide ( thank u very much). It is currently in week4 curing. It seems kind of fragile though? Did yours feel like you could crush it pretty easily? I used 5 parts perlite (loose fill masonry insulation), 1 part refractory cement and 1 part Portland cement. I'm worried it is not hard enough to withstand the heating. Thanks for your insight. Dan
Hi Dan, thanks for watching. You used 5/2, that should be good enough and strong enough. When the dome is cured long enough it should work i guess. Dont use it "full heat" first times. Keep me informed. Cheers
Luuk,
Turns out it didn't cure hard enough. Had to scrap it. Not sure if it was the perlite I used or the refractory cement. Oh well.
do some mixture research. i saw some YT videos where perlite and portland is used making rocket stoves. Maybe it helps out.
How many parts of cement did you use? Im trying to make one but i dont want to mix up too much and purchase to little perlite. The ball im using is 65cms
Did you reinforced with wire?
nope, I should have done.
leuk project, misschien ga ik het ook ooit proberen. vraagje
je hebt portland gebruikt, lees ik maar waarom heb je geen vuurbestendig cement gebruikt? of is dat niet nodig
Hallo, sorry voor de late reactie. De zelfde vraag heb ik ook gehad en niet echt antwoord op weten te vinden. Alles wat ik kon vinden op het web qua mix samenstelling werd portland in gebruikt.
hola k tal k cantidad de perlita usaste agrade seria la respuesta
THAT WAs great
How much perlite and how many bags of concrete is used for this? Do you have a material list?
i quess 2 x 100 liter perlite. 2 bags portland cement.
Beste Luuk,
Heb je ook enig idee hoe heet de buitenkant wordt van de oven, als je oven binnen heet is voor de pizza's?
boerenterprise bedankt voor het kijken. Temperatuur van de buitenkant is rond de 80 graden Celsius
Hallo, ik wilde weten welk cement ik moest gebruiken? normaal of ongevoelig?
Hello, I wanted to know what cement to use? normal or refractory?
Good video and good job !
Sorry voor late reactie. Portland cement / normaal.
Does it still work?
it still works but there are big cracks in the dome.
Bij 0.42 lijkt de oven nog al "korrelig" en het eindresultaat is helemaal glad, heb je een laag met fijnere perlite korrels over de 1e laag gedaan? thanks voor de video!
karbijnhaak Vierdeling ik heb er een du ne stuclaag op gedaan waardoor die mooi glad lijkt. Echter heeft dit de winter niet overleeft.
Luuk Draaisma ah okay, ik heb mijn oven gesmeerd en hij heeft 1 dag gedroogd maar er vallen droge korrels af. Is het denk je slim om er een nieuwe laag met fijnere korrels op te smeren?
karbijnhaak Vierdeling hou hem maar nat met doeken en langzaam laten drogen. Echt wel 10 weken aanhouden. Die van mij heb ik verknalt omdat ik na 6 weken niet meer kon wachten.
What is the name of this song? We’re can I find it?
Dont know, RUclips standaard song
This is a great project...good job! I am about to start planning my own build and I think that I will use your technique as my template. I just wanted to know if you have noticed any significant heat loss through the base (under the table). I ask because I noticed that you did not use insulating fireboard under the concrete/perlite slab nor the use of a fire blanket over the dome or firebricks for the cooking surface. Each would add significant heat retention. If you measure the heat around the exterior of the oven, at full fire temperature, it should not be more than 60 deg Celcius (140F). Do you achieve this? This information will help others to avoid a possible structural failure in the long run. Thanks for sharing!
+Francesco Guerriero hello Francesco thank you for watching my video. The temperature outside the oven is about 80 till 90°C at full fire. For pizza baking the bottom isolation is okay. The heat of the tiles are hot enough for baking pizza. I agree with that using fireblanket at the bottom would be better. Maybe I will do this to keep the temperature high. I am planning to rebuild the dome part because there are big cracks. When rebuilding I use two layers concrete with fireblanket and chickenwire between the layers .good luck !
If you are rebuilding, may I suggest you incorporate fireclay into your perlite mix so that your dome will withstand the rapid heating and cooling cycles without cracking. Please keep everyone posted as to your progress.....it's inspiring
what ratio would you use for the fire clay/vermiculite/cement/water?
Blake L why do you need silica sand? Is it a bad idea to reinforce with chicken wire in the middle?
@@luukdraaisma I think you might want to look into using "rutland refractory cement" and avoid Portland cement. Portland cement might be the reason its cracking. I also hear perlite might be the wrong thing to use. There is another product similar to it that can be used but I can't recall the name of it right now. Anyway, its a nice build. You could also go traditional and use adobe to make the top like they do for earthen ovens.
How thick are your walls? Also how hot does it get to?
Lee Glasgow Thanks for watching Lee! Oven is 6/7 centimeter thick. The heat can go up to 450/500 degrees Celsius .
At this point in the video ruclips.net/video/rM-a1f7kF40/видео.html it looks like you added a skim coat to the outside, what did you use? Also I like your stand and want to do something similar, what did you put under the baseplate? Wood?
Lee Glasgow I made skim of Portland. It didn't survive winter, cracks all over the dome. I think I should have used some water resistant coating. I used timber under the baseplate.
The air dan, but wahat about the floor temp? It is the floor temp that needs to be 600-700 F.
Nice job on the oven Luuk ! Did the metal chimney expand and crack around it ?
Hi There. Thanks for watching! Little cracks around the chimney, bigger cracks in the dome.
Patch up the cracks and build the fire up slowly to 800 F maybe !
Great videoGuys between you and JJ Grice I'm trying to build Mine soon when I get some days off lol.
Let me ask you is it ok to mix Perlite with Stop heat Cement the one they use in chimney instead Portland Cement Let me know that cement can resist up to 2000F so I never used it before.
Thank you
Hi, waar kan je perlite kopen? bij tuincentra?
karbijnhaak Vierdeling bedankt voor het kijken! Thermall.nl
thermall.nl/vermiculiet-en-perliet-korrels/1802-perliet-korrels-fijn-0-3mm-100-liter-zak.html
what size is the base top?
John Romero baseplate 1 x 1 meter
How is it working out? I mean any cracks major issues as not holding temperature?
I am building one like this as we speak but plan on putting a ceramic fiber blanket over it an then Stucco it
Great job by the way!!
+Maurizio Bussolino keeping the heat in the oven is no issue. Cracks yep! Big ones appeared. Planning to rebuild the dome part and make it two layered, also with fiber blanket.
Cosider using a sand mold instead of a ball. Apply mortar in 1" layersvandvallow each layer to thououghly dry. Apply fine mesh wire on second layer. Use thermal blanket material just before final layer.
is it Holding up? any cracks?
zalsson HI there, thanks for watching! Big cracks yes. Planning a rebuild. Don't know if I'm gonna use perlite again.
Okey, if you not use perlite, what other soulotion have been looking at.
zalsson don't know yet. Maybe firebricks or cob clay.
Forno Bravo recommends vermiculite.
Get a door made with a glass front for being able to keep the heat in.. the flue with allow excess heat to escape..
100 litres perlite and 20 portland it's ok?????
yes.
I already built one like this one but the temperature is so low. I didn't use any clay or radiant materials and I think that's why.
Forno Bravo recommends 6" of thickness when using vermiculite cement. Does not anyone research before doing a build?
Looks great! I was wanting to make one of these as well. What size timber did you use for the stand? What is the metal on the base supporting the concrete?
Matthew Cuff cdi-icm.co.uk/Lewis-Dovetailed-Sheeting
is it still good or did it crack?
+elyseh biagini cracks!
Did it crack?
Of course it did.
Better to buildvthe igloo on top of moist sand mold and cover the whole thing in wet blanket and plastic for curing. The bottom and top need to remain moist during curing, at least for a few days.
you probably have cracks because the metal chimney expands at a different rate than the perlite
TurfWar yes, metal chimney was not a good idea.
Should i make perelite and cement mix chimney?
😊
Diameter please ?
80 cm
THIS EXERCISE BALL METHOD SEEM TO BE WORKING.
best mix some AR fibreglass into the mix, makes it really strong
Thanks for watching Andrew! do you have any experience with adding AR fiberglass into the mix? And does react on heat?
Yes, I built my oven 2 layers, inside layer as described, outside layer is a cement render with AR fibreglass, with hi density insulation (suitable for kilns) between the 2 layers
The insulation is covered with aluminium foil and chicken wire to make the top layer bond
The reasons for this is
1. the single layer by itself allowed too much heat through, heat loss = waste, reduced temp, cools off too quick
2. the first layer cracked around the chimney
The two layers bond around the opening (i left about 4 inches), the chimney and the base edge ( about 2 inches)
I did not add fibreglass to the first layer, but cant see any reason it will react to heat
It is amazingly strong, easy to work with, and you dont need much - I used 1/2 kg for a wheelbarrow load
Andrew Hart Andrew did you use perlite in the 2nd layer or just cement + fibreglass?
That frikkin music bahhh!
Ours cracked like crazy. Suggestions?
Mine also. Maybe a new thin layar, chickenwir and second layar.
Ten week cure?
Amount of money spend on wood base could of been done with cheap cement blocks.Now must worry about wood burning up.
wtf is a 'showen' ???
Is it bad that I don't trust the attention to detail of someone with such bad grammar? Probably...
poor showing