Hi, new Aussie

[david s]

Re: Hi, new Aussie

Hi vic brickie,
Just a tip about your insulating vermiculite layer over the dome if you haven"t done it already. Don't use the 5:1 verm;cement ratio, (like you did for the under floor layer) over the dome, you don't need the strength there and adding cement to the mix drastically reduces its insulating value. I use a 10:1 which will still stand up vertically ok. You'll think that it will be too weak to set up but it does, and it leaves you with a good insulating layer.

[Vicbrickie]

Re: Hi, new Aussie

Cobblerdave i still think that your plan to try the glasswool/rockwool with the roof off and see how it goes is worthwhile.
My small amount of research suggests that the glasswool used in home insulation is really not that different from the stuff used to insulate pipes and so on. Obviously it isn't used on as high a temperature but i dont think the temp will be all that high on the outside of enough vermiculite or blanket
Either way they say it is non combustable and non carcenogenic so i think there is only one way to really find out!
When i get the enclosure done i'll fill with glasswool and give it a few good burns with the roof off so i can see whats going on.
I'll post what hapens.
If mine is ok yours should be too??
Again if anyone reads this please dont take my ideas as any kind of advise i am basicaly experimenting and dont want to cause a problem for anyone else

[Johnny the oven man]

Re: Hi, new Aussie

didnt use blanket cant afford it was hoping for something cheaper than vermiculite but may just have to save for a bit. thanks for the tip bout the sand

Blanket/vermiculite is the BEST option. Blanket is $75 for 7m, and V'lite is $30 for 100L, we have both in stock in Nunawading. 0451470371

[cobblerdave]

Re: Hi, new Aussie

Dear Vicbrickie
What do i say...sorry for the dodgy advice. At this point I dont know what to do. Yes the insulation can stay in the roof space, but the oven? Thinking of doing a cut into the dome of the oven to find out whats going on in there. What action I'll take when I do I dont know

Regards Cobblerdave

[Vicbrickie]

Re: Hi, new Aussie

after a little research it seems that the only real differences between "glasswool" and what is sold as "rockwool" are density and the specific mineral they where melted from. Batts of both seem to be bonded with a "thermosetting resin" but both seem to be ok with temps up to 350c.
I think either should be ok on the outside of 100mm of vermiculite.

Like i said i only did a little research so please correct me if im not right and dont take it as gospel. I wouldn't want to give people dodgy advise

Oh and it seems "Rockwool" can be identified by its "Green/Brown" colour

[brickie in oz]

Re: Hi, new Aussie

There used to be a brand that went by the name Rockwool, I think it was Bradford, and they were all fibreglass.

[cobblerdave]

Re: Hi, new Aussie

Dear brickie in oz

Your confused...... I'm confused Those batts are the last of the 1/2 pack left in my roof space after I insulated about 10 yr ago. I'm sure I brought rockwool even remember bypassing the Bunnings 2 pack for 1 special to buy them...

Regards cobblerdave

[Vicbrickie]

Re: Hi, new Aussie

Cheers cobblerdave sounds like a good plan thats what i will do.
Thanks for the advise

[brickie in oz]

Re: Hi, new Aussie

Yes I used "rockwool"
[ATTACH]25052[/ATTACH]

Im confused, which isnt hard to do , but you batts look like fibreglass batts, rockwool is usually brown and stiffer.

[cobblerdave]

Re: Hi, new Aussie

Dear Vicbrickie

I set out to bend a rule not break it. I fired this puppy twice and then pulled off a section at the back before i was happy. No smells, no melting... that ceramic blanket is amazing! was only warmish to the touch. It was only then that I rendered over it. Yes I used "rockwool" and the binder is sheeps wool.
Why don't you finsh the enclosure and leave the roof for a while? pack it full of rockwool and see what happens. If it doesn't work you can then change your plans with no damage done.



Regards cobblerdave

[dmun]

Re: Hi, new Aussie

burning fibreglass sounds like a real bad thing to me.

It's the organic binder that's the problem in domestic fiberglass. It will burn and stink. It should be OK over a layer of vermiculite concrete, particularly if it four inches thick.

[Vicbrickie]

Re: Hi, new Aussie

Cobblerdave. yes i do plan to enclose and im almot there with the 100mm vermiculite just need one more coat.
So when you say "Rockwool" do you mean the fibreglass based batts? or the stonewool ones?
I have no doubt that the stonewool ones would work better but i can get heaps of the glass stuff off cuts and leftovers for free.
The glass based are supposed to be good up to 230 C so im wondering if the 100mm vermiculite will protect it from enough of the big heat
Also wondering if any large cracks develop over time and enough heat gets through to affect the wool how unhealthy it will be? burning fibreglass sounds like a real bad thing to me.

[david s]

Re: Hi, new Aussie

I was hoping maybe i could use some sort of building product as a loose fill as i have access to left over just about everything to build a house.
Maybe cieling batts? does anyone know if they would be suitable? toxic?[/QUOTE]

Ceiling bats are ok as cobbler dave said, but if you are planning to render/stucco over it you'll find that it compresses too much. But ideal for an enclosure.

[Vicbrickie]

Re: Hi, new Aussie

Thanks Lburou.

[cobblerdave]

Re: Hi, new Aussie

Dear Vic brickie
Now then your going to enclose? right? have you got a full 100 mm 4 inch (and I mean Full) of pearlite insulation over your brick Dome? If so why not use "rockwool" over the rest ? The biggest heat has been taken up by the 100 mm of pearlite so the rockwool is protected from the " big heat"check out the aussie threads there's a few of us that have done the same. Jas has en "enclosed" oven 100 mm pearlite and "rockwool" mine is 50 mm ceramic and "rockwool".....sorry I was very carefull with my words before before... I did not want to suggest that "rockwool" was a option against those hot bricks...but once there protected from that big heat ( 600 C) by a full fire proof layer any extra insulation is good thing....

Regards CobblerDave