My first attempt for 42" oven / changed to 36"

[Toomulla]

Re: My first attempt for 42" oven / changed to 36"

Oh gosh, I don't know. I have only used ceramic board and blanket so have no experience in mixing the perlcrete. What's the volume of the perlcrete layer? I think if you are careful with mixing you won't lose too much volume by breaking up the perlite.

My oven is about 40 inch and I used 4 bags from memory but my thickness is more then 4 inches a 100 litres is about 4 cubic feet or 12 sq ft at 4 inches if my rough math is correct

[david s]

Re: My first attempt for 42" oven / changed to 36"

Thanks Tony!
I prepared the wood frame and is ready for the perlcrete.
A bag of 100L perlite is enough or i need to buy more?

Work out your volume by multiplying length x breadth x height and add 15-20% more to compensate for reduction in volume when mixing. Forget the extra volume of cement added as it merely fills in some of the spaces between the vermiculite grains, therefore not contributing to increase the volume of the mix.

[George_M]

Re: My first attempt for 42" oven / changed to 36"

Hi,
Some modifications at the insulation layer.
I changed the height from 8" to 4" and i get totall 3 bags of pelite.
100L per bag and the cost is 9euro per bag.
Now i will start to prepare the perlcrete.

[George_M]

Re: My first attempt for 42" oven / changed to 36"

Just finished the perlcrete layer.
I used total 10parts perlite and 2 parts cement.
I didn't use to much water,i used 2,5 parts.
Needed more water
I hope that it sticks well.

Also,this material can hold the weight of the oven?
I think that will smash it
You can se my photos

[NCMan]

Re: My first attempt for 42" oven / changed to 36"

Looks good, George. It will work fine.

[Laurentius]

Re: My first attempt for 42" oven / changed to 36"

Just finished the perlcrete layer.
I used total 10parts perlite and 2 parts cement.
I didn't use to much water,i used 2,5 parts.
Needed more water
I hope that it sticks well.

Also,this material can hold the weight of the oven?
I think that will smash it
You can se my photos

Hi George,

I`m sorry to inform you that your name has been changed! You are hereby and forthwith will be known as, "Sir Doubting Thomas of Greece"! Yes, your perlcrete insulation layer will accommodated the weight of the oven. Yes, it will smash if your drop the oven onto it from almost any given height, but not if you build it brick by brick. Sand will do, the hearth need not to be cemented down, the sand is used to level the bricks, but its not necessary, the hearth bricks do not need spacing for expansion. When old ideas surface that have been proven false, (such as glass bottles, and mud, are great insulation for WFO`s), or new ideas that haven`t been tested, does bring out the ????? and perused with caution.

[George_M]

Re: My first attempt for 42" oven / changed to 36"

Hahahaha!!!
Now i need to protect the perlcrete from the rain if it start again.
So,i am prepared.I bought Tarpaulin to cover it when it starts to rain.

How many days need to dry before start the cooking floor?

[Laurentius]

Re: My first attempt for 42" oven / changed to 36"

Hahahaha!!!
Now i need to protect the perlcrete from the rain if it start again.
So,i am prepared.I bought Tarpaulin to cover it when it starts to rain.

How many days need to dry before start the cooking floor?

It depends on your purpose! To evaporate moisture a week to 10 days. To be strong enough to start building the hearth, once it sets it good to go. Hang in there you`re doing a good job, I`m just having some fun with you. By the way did you get any pigment for you stucco?

[George_M]

Re: My first attempt for 42" oven / changed to 36"

No problem Laurentius!
Not yet,i will search for pigment when i finish the dome.

[George_M]

Re: My first attempt for 42" oven / changed to 36"

Hi,
The weather is sunny today and the temperature is almost 17 oC or 62.6 F.
This is good for the perlcrete to dry earlier..

[George_M]

Re: My first attempt for 42" oven / changed to 36"

Hi again,
Until the perlcrete layer will dry i prepare for the next steps.
First of all,do i need to cut all the bricks in half?
Do i need i cut also wedges?
Or half bricks are ok?
You can see my attachment.

My tool is an angle grinder,so i need the most easy method.

[Tonyp]

Re: My first attempt for 42" oven / changed to 36"

Up to you George. You can use square half bricks. Most builders cut the wedge to reduce the sideways gap between each brick on the outside as well as eliminate the triangular gap that forms when you put two tipped bricks with square sides next to each other. So in actuality you are cutting a wedge but with the cut angled so you end up with a trapezoid if you look at the inside face of the brick. So if you do use square bricks just be aware you will have more gap to fill on the outside and have triangular gaps to fill on the inside.

I think most builders are trying to minimize as much as possible the mortar gaps inside as the brick is more durable, plus it looks nice. With a wet saw and jig it doesn't take much effort to do the cuts, but if I had to build with just an angle grinder I would think twice about having to make all those angle cuts for sure. Either way it should function perfectly fine.

[George_M]

Re: My first attempt for 42" oven / changed to 36"

I think that cutting half squares is easier with the angle grinder because i will avoid more cuts if i cut wedges.
I hope that square bricks will works well.
Thanks Tony

[George_M]

Re: My first attempt for 42" oven / changed to 36"

Hi,
I made the wood frame of internal floor oven to center it when the perlcrete will dry.
When i put it on the perlcrete a thought of a completed oven came in my mind.

[Tonyp]

Re: My first attempt for 42" oven / changed to 36"

Coming along nicely George! Won't be long before you see the dome taking shape!