It does compress a bit, try not to work it too much, and keep it loose and don't pack it in, the air is what insulates. Also I found it easiest to mix in the cement dry and then add water, if you mix after the water you might over work it. Think of it like baking a cake and keep it light and airy. Cheers Marcus
Rich, vermiculite is quite fragile so whilst it was 100l when it was packed, the subsequent handling will have reduced that a little, similarly, the action of mixing will break it down a bit but not much.
8) This is such an interesting build ! they say neccessity is the mother of invention and I reckon that we have proved that an untold number of times on this forum !!! I am loving the pictures and instructions as you go along , its just a shame that we cannot get there for the first lighting :lol:
Thanks Rivergirl... Always try to be a little bit different!
Yeah, It is a long way to come for a pizza! :lol:
I think I'm still on target for my New Years deadline... Finish work mid next week (xmas break) so have a good few days to work on it!!
I'm doing an alternative cheaper option as I want to be sure our family will use the oven, I didn't what to spend heaps and then find it sits unused.
With all the recycled bits and pieces I have used and found makes the oven relatively cheap, Even with the huge cost of Fireclay and Vermiculite here in NZ...
One niggling issue that has been in the back of my mind though... I hope that timber frame is strong enough to take the weight of the oven!! The bricks that come out of the Night Store Heaters are very heavy!
I was going to lay double layers for fire bricks on the hearth, but with the weight issue, I may leave it at one layer.
I'm going to build additional support under the concrete slab to ease my mind before I lay any Firebricks.
Looking back at your earlier pics of the frame....it looks quite sturdy. The only thing I would have suggested for piece of mind is to build a center wall/support......but you've already beat me to it.
Marcus... I was having doubts about my timber base being strong enough so I got hold of another few fence posts and added extra support to all the beams. There is heaps of support for the slab now
Tony... I was going to use double layer of hearth bricks because the bricks I am using are only 40mm thick. These night storge heater bricks seem to be twice as dense as normal bricks. So hopefully they should be OK.
I currently trying to clean out my drum ready for the oven build. Last day of work for the year today so hopefully will have a couple of full days working on the oven!!
Looks great, the extra supports should be enough. As regards the hearth bricks, I used a layer of red clay brick with a layer of the heavy storage heater bricks as you've done. Have you decided if you're going to use some bricks to rest the barrel on? Here's what I did. countrywoodsmoke.files.wordpress.com/2011/06/1000079y.jpg?w=1000&h= Happy Xmas Cheers Marcus