Oh, to bake the bread and have a bath...Stick Fired Mud Oven
and Hotwater Heater in progress..will it work? Is it too much to
ask to bake Bread AND have a Bath ?
Time will tell...we will never run out of sticks here so if this
works it will be a good prototype for The Real House
( and with any luck might keep us fed and clean during the
Mudworks involved in building The Real Thing!)
step 1. I started on the ground (after removing roots and
vegetative debris from the site) with a Tire* whumped full of
gravel ( lots of gravel, lots of whumping- an Earthship would require alot of this kind of stuff- my
limitations are becoming apparent...but part of the caper is Testing Procedures, well that's one
tested!) The piece of tin at the back will hold up the cob as it builds- it is secured to a huge fallen
log so it will need an insulating layer to make sure the wood can't heat up when the oven is fired.
*I know tires are flammable but this one will be well and truly encased in mud and, having faith
in the fact that heat rises, I fondly hope the tire will remain as cool as the proverbial cucumber
throughout the making and the baking.
Step 2. Using rocks that will take the heat (
not the Mathinna Mudstone which is native to my
bush block and explodes fiercely when heated) I built up a foundation for the cob walls of the
oven as well as supports for the 'found piece' which will make the oven (see picture) and to
hold the boiler for the hot water. ( temporary stand visible in the picture) I have used 'light
straw '( straw coated in clay slip) to insulate the floor of the fire box-I wonder if the straw
will stay good once the oven is fired? It is used as insulation on the
outside of ovens in books and
i'm still a bit keen on insulating the tire from any heat that might forget to rise? There will be
additional layers of cob and mud plaster over it in any case...also a layer of fire ash between any
metal parts and the cob which as i understand will let the metal expand without cracking the
cob?
Design principle as i 'get it' (from books again) is to make sure the
firebox slopes uphill towards the flue and narrows in diameter
as it does so. I have mudded in a holey brick at each side of the
firebox to make sure the fire can draw. So far the path of the fire
does a 'dog leg' where the boiler is which is how a Russian Stove
works- utilizing almost all of the heat from the fire by virtue of it's
meandering path so that the flue (in a properly build example)
should be only warm- in this case i guess the proof will be in the
pudding- another mudmix curing for the next episode ( rather
like 'Wheelbarrow Pudding'- who said if you can cook you can
build?! Something else to Test as i can definitely cook- they don't call me 'The Pancake Queen'
for nothin...) I am using Becky Bee's Cob books as a guide here and my new hero is Nadir Kahlili!