Filling joints in hearth slab?

[kkgator]

Re: Filling joints in hearth slab?

Rich,

I also purchased a composite oven & I agree the directions are pretty basic. If you look at the DaveMartin build it'll give you some nice pics to look at. It is my understanding to just use the mortar on the pieces after they are together in the joint and on either side. Dave (West Virginia), shows a nice picture of this. Then you use mortar around the base of the pieces where it meets the base and he shows a picture of this as well.

[RichC]

Re: Filling joints in hearth slab?

Yes, there are some instructions but they're kinda sparse and don't give much info

[david s]

Re: Filling joints in hearth slab?

It sounds like your oven did not come with any instructions.
The floor of the oven tends to heat faster and therefore expand more than the base of the dome, setting up thermal stress.The floor bricks are usually set on a dry mix of sand and clay so they will be level but are left free to expand.

[RichC]

Re: Filling joints in hearth slab?

Thanks Mr C, so ill just use mortar to stick it to the vermicrete slab underneath?
I assume that's ok?
Also, why isn't it mortared to the dome, seen as the dome sits directly onto the base?
Thanks

R

[mrchipster]

Re: Filling joints in hearth slab?

The floor should not be mortared in any way.

Not itself to itself or floor to dome.

Floor should be allowed to float free. And separate from dome.

[RichC]

Hi, my oven that I'm about to assemble has a 4 section hearth slab and a 4 section dome. I've fibre blanket to cover it and it'll then be covered in vermicrete. The kit came with a bucket of masonry cement to stick it all together. Should I fill all the joints in the hearth and dome completely with this refractory cement also or should it be used sparingly?

Thanks

Richard