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Old 08-25-2013, 03:15 PM
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Default Filling joints in hearth slab?

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
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Old 08-25-2013, 06:46 PM
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Default 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.
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Old 08-25-2013, 11:14 PM
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Default 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
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Old 08-26-2013, 12:02 AM
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Default 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.
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Old 08-26-2013, 12:08 AM
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Default Re: Filling joints in hearth slab?

Yes, there are some instructions but they're kinda sparse and don't give much info
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Old 08-26-2013, 03:38 AM
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Default 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.
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Old 08-26-2013, 03:47 AM
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Default Re: Filling joints in hearth slab?

Thanks KKG, ill check that out
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Old 08-26-2013, 06:26 AM
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Default Re: Filling joints in hearth slab?

Quote:
Originally Posted by RichC View Post
Thanks Mr C, so ill just use mortar to stick it to the vermicrete slab underneath?
I assume that's ok?
NO! "The floor should not be mortared in any way!!!! It needs to float free.

Quote:
Also, why isn't it mortared to the dome, seen as the dome sits directly onto the base?
The floor and dome expand and contract at different rates and bonding them together will promote cracks.
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Old 08-26-2013, 07:09 AM
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Default Re: Filling joints in hearth slab?

Thanks MrC! Lucky I asked.
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Old 08-27-2013, 01:53 AM
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Default Re: Filling joints in hearth slab?

The composite oven pieces are grooved to fit on top of the floor & extend to the base. It is at the base where mortar needs to be applied as well as the small joint of the oven pieces. If you look at Dave Martin's build you will understand what I am describing.
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