DIY Casting Modular Oven

[david s]

About a double handful per 25 Kg dry mix. make sure the fibres are dispersed well ie mix about double the time you would think.

[david s]

Originally Posted by robertjusher

Thanks for the cement info David.
I plan on casting mine in place on the firebrick floor... I was going to use hebel as an under floor insulator. I read somewhere and agree that a low first couse of fb will give you a hard edge to stop your peel chipping the sides of the oven and set the thickness for the hand formed casting to sit on. ,,,

I think this is a good idea. One other advantage is that you can start sloping the walls in above that first course, because making the castable stand up vertically is a bit tricky, once it starts to slope in it gets easier and easier. I've found the trick is to take a handful of the mix and use one hand to press in from the outside while using the other hand to make a flat, horizontal platform at the top of that handful. By working all the way around the dome in this way, you then have a good ledge to place the next course on top.