Advice for floor insulation

[Fed]

hi everyone,
im new to the forum, my name is Fed and im living in Davao philippines right now.
Im building an oven and came across this situation where im not sure what is better for the floor insulation..
original first option was:
first layer of glass and rock sea salt, then refractory mortar, then alumina bricks.

the new idea came up because i bought ceramic fiber blanket for the dome and i have some extra so i was thinking to include a layer of ceramic fiber between the glass/salt and the refractory mortar.

any recommendations please?

thanks in advance!
Fed.

[brickie in oz]

Re: Advice for floor insulation

Search for a member called Lancer, he is in the Philippines and he has a solution to your floor insulation.

Lancers build thread.

[david s]

Re: Advice for floor insulation

hi everyone,
im new to the forum, my name is Fed and im living in Davao philippines right now.
Im building an oven and came across this situation where im not sure what is better for the floor insulation..
original first option was:
first layer of glass and rock sea salt, then refractory mortar, then alumina bricks.

the new idea came up because i bought ceramic fiber blanket for the dome and i have some extra so i was thinking to include a layer of ceramic fiber between the glass/salt and the refractory mortar.

any recommendations please?

thanks in advance!
Fed.

In humid tropics salt turns to mush so is not suitable. Ceramic blanket is also not suitable as under floor insulation because it will compress with the heavy weight of the floor and dome over it. Most oven builders find a 5:1 (vermiculite or perlite, cement) to be a cheap and strong enough solution, but you could also use scoria,pumice or coral if they are local and free or cheap.

[Fed]

Re: Advice for floor insulation

hi again,
i found silica sand here locally.. do you think that could work for the refractory mortar? instead of vermiculite?
thanks.
Fed.

[david s]

Re: Advice for floor insulation

hi again,
i found silica sand here locally.. do you think that could work for the refractory mortar? instead of vermiculite?
thanks.
Fed.

Yes it will be fine for the refractory mortar for laying bricks, but not much use for insulation. You need a material that contains lots of air.

[brickie in oz]

Re: Advice for floor insulation

instead of vermiculite?

Vermiculite isnt used as a mortar.

[Fed]

Re: Advice for floor insulation

Vermiculite isnt used as a mortar.

on the mix for the layer where you rest the oven floor.

the most common is to use fire clay..
was wondering if the silica could replace it.. but i was wrong..
so im gonna try to get pumice or vermiculite somehow..

[Fed]

Re: Advice for floor insulation

Yes it will be fine for the refractory mortar for laying bricks, but not much use for insulation. You need a material that contains lots of air.

thanks for your reply, is it necessary to put insulation on the refractory mortar (the one i lay the bricks on) ?
or with the silica mix will be fine..
for dome insulation i have ceramic blankets...