Cob or brick & cement? First time build in Winchester, UK

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

Nice one. Right I'm out of excuses, better build this f**ker now

[cobblerdave]

Re: Cob or brick & cement? First time build in Winchester, UK

G'day
Can't tell you exactly . But I can tell you don't order in bulk.
The sand is the most amount of material you'll need and I'd say 2 or 3 bags at the very most. Don't hire a cement mixer either you'll need small batches. A 20 ltr bucket and a large paint mixer on an electric drill will do the job for you.
Regards dave

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

I don't suppose you can tell me how much homebrew mortar I'm likely to need for my build can you Dave? (or indeed any lurkers )

[cobblerdave]

Re: Cob or brick & cement? First time build in Winchester, UK

Dave, you are a prince - that's amazingly helpful, thank you.

We don't use feet and inches either, I just got into the habit when talking about wfos as it seemed like everyone else did!

Cardboard it is - I'm the same as you, I reckon I need to see it.

G'day
Funny about that...
Pay backs are a bitch, I'm
Still paying back the people that helped me out all those years ago.
Simple as this ...
I'm a happy man that I can help
Regards dave

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

Dave, you are a prince - that's amazingly helpful, thank you.

We don't use feet and inches either, I just got into the habit when talking about wfos as it seemed like everyone else did!

Cardboard it is - I'm the same as you, I reckon I need to see it.

[cobblerdave]

Re: Cob or brick & cement? First time build in Winchester, UK

G'day big Dave

Had to resister to see your post so there's a reply on UK forum as well

You just have enough room by my calculations...just. You forgot that the dome entry bisects the dome and takes a chuck out of that 28 in dome. by my calculations it adds another 3 to 4 ins giving you 14 ins in which to build your entranceway. With a brick length being 9 ins....close enough to a brick and a half worth to be perfect'ish.

Now you got to remember Australia hasn't use feet and inch's for 40 years so the following should be checked.

Dome internal width 28 ins dome, internal height 14ins, dome entrance with the 63 per cent rule should be near enough to 9 ins. dome entrance width at just a smidgen under half should be12 ins.

Entrance way should be as big as possible in my book so using nearly all the width of a brick of the oven entrance at 4 1/2 ins should gain you an entranceway way width of 20 ins and a height of 18 ins.

With the size of a 28 in oven on the slab you have 10 ins either side to play with... 4.5 ins for the 1/2 brick dome and 4 ins for a standard thickness of V-crete, leaves you with 1/12 ins of render or 1 1/2 in cut down brick. If you wanted to enclose the oven there is nothing stopping you from building outboard of your stand.

Now I'm a visual person so If I can see it so much the better, so it was a whole stack of cardboard cut outs for me. you can lay the out on you stand and really get an eyeful of what you building. don't stop at the flat ones either a couple more showing the dome heights and even the dome entrance that will really show you how much it cuts out of the dome.

Hope this helps


Read more: Oops, there was an error! | UK Wood-Fired Oven Forum

[cobblerdave]

Re: Cob or brick & cement? First time build in Winchester, UK

Gday
Sorry that link needs a password

regards dave

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

Wondering if I've dropped a bollock with the size of my base. Link to UK forum here if anyone can throw some wisdom into the ring

http://ukwoodfiredovenforum.proboards.com/thread/1872/size-anxiety-28-wfo-base

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

G'day
Sorry I was wrong to use the term waterproof.
Pearlite and vermiculite board are bonded together usually with sodium silicate which is water soluble which is why it's to be protected from moisture.
Any insulation should be protected from water because firstly it doesn't work when wet. Secound if you heat water to steam one litre of water expands into 1500 ltres of steam which is enough to damage an oven.
Don't worry I've had a wet oven on more than one occasion and you just have to be patient and dry it slowly rather than trying to do with one or two big fires!
Regards dave

G'day Dave

Phew

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

That'sE=oblertone;175002]I commute between Devon and London on a weekly basis along the 303; if you come up short just let me know because repurposing stuff is what it's all about.[/QUOTE]

That's really good of you, thank you very much indeed! Couldn't agree more RE repurposing. I'm actually only just off the A303 @ Sutton Scotney. Maybe i could drop you a line if I don't get enough in the next week or so?

Cheers

Dave

[cobblerdave]

Re: Cob or brick & cement? First time build in Winchester, UK

G'day
Your V-Crete once dry you can dent it with a fingernail , but it will support your oven, no probs. and insulate like a champion..
I have not used vermiculite board , but I've seen it said that it doesn't suite in open situations as it is not completely waterproof.
Just worth a check... If I were you
Regards dave

G'day
Sorry I was wrong to use the term waterproof.
Pearlite and vermiculite board are bonded together usually with sodium silicate which is water soluble which is why it's to be protected from moisture.
Any insulation should be protected from water because firstly it doesn't work when wet. Secound if you heat water to steam one litre of water expands into 1500 ltres of steam which is enough to damage an oven.
Don't worry I've had a wet oven on more than one occasion and you just have to be patient and dry it slowly rather than trying to do with one or two big fires!
Regards dave

[oblertone]

Re: Cob or brick & cement? First time build in Winchester, UK

Devon's probably a bit far to go, but thanks very much for the offer! Was surprised how many bricks there are per heater; am hopeful that I'll fill the quota easily enough.

I commute between Devon and London on a weekly basis along the 303; if you come up short just let me know because repurposing stuff is what it's all about.

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

Devon's probably a bit far to go, but thanks very much for the offer! Was surprised how many bricks there are per heater; am hopeful that I'll fill the quota easily enough.

[oblertone]

Re: Cob or brick & cement? First time build in Winchester, UK

Yay! Dozen big free storage heater bricks sourced this afternoon.

I've got about 10 spare ones if they're of any use to you ?

[bigdavenorcott]

Re: Cob or brick & cement? First time build in Winchester, UK

Yay! Dozen big free storage heater bricks sourced this afternoon.