Joint finish ?

[jim81147]

In reading these differnet threads i have found many of the answers to my questions , but one thing I have not ran accross is joint finish on the inside of the oven . Are the joints struck ( smoothed out with a joint tool ) or are they just cut flush with the brick . I know towards the end you may not be able to reach some of them to finish , so maybe its really not important . Thanks.

[deejayoh]

Re: Joint finish ?

Jim -
Generally, builders angle the bricks so that there is almost no joint inside the oven. You can use a joint tool, but really you want as small a joint as possible

[Tscarborough]

Re: Joint finish ?

If possible, it will always be better to densify the joint, whatever it is. Not for shape, just to pack the mortar. A finger works fine.

[jim81147]

Re: Joint finish ?

If that is the case , what would happen if the bricks were dry stacked ? The cladding should hold everything in place , should'nt it ?

[jeeppiper]

Re: Joint finish ?

The joints in the top of my dome are down-right embarrassing. I have stelagtites hanging from the ceiling!!! I wish I could do all over again, but guess what, it works fine! As a matter of fact, my oven is cranking right now! Cooking some wings and baked potatoes....

[Tscarborough]

Re: Joint finish ?

Technically, you do not need the mortar at all. Realistically, you need the mortar to contain the fire.

[david s]

Re: Joint finish ?

Many kilns are built either partially or completely with mortar less joints.

[jim81147]

Re: Joint finish ?

I am building a barrel vault oven and want to lay the base bricks horizontally for 3 courses before starting the arch. I think I will put a small mortar joint on this "wall" just to hold them in position for the arch. Does that sound like a reasonable method?

[brickie in oz]

Re: Joint finish ?

Another Vaulter.....
Have you worked out how are you going to over come the side loads on the oven walls yet?

[jim81147]

Re: Joint finish ?

Al , I am planning on a 4 inch cladding . My thinking might be all wrong here , but living where the avg. temp is 40 degrees or below for 5 months out of the year , I am thinking that the mass will be to my benefit . Thoughts?

[brickie in oz]

Re: Joint finish ?

4" of what sort of cladding?

Have you a rough sketch of what you are aiming at?

[david s]

Re: Joint finish ?

4" extra thermal mass is a lot. It will take many hours for the heat to soak right through to that thickness. You would probably be better to halve the cladding thickness and increase the insulation.

[mrchipster]

Re: Joint finish ?

4" extra thermal mass is a lot. It will take many hours for the heat to soak right through to that thickness. You would probably be better to halve the cladding thickness and increase the insulation.

I agree with David, in Minnesota it gets even colder, and I spent more on insulation and it is no problem keeping my. Oven warm for days after one pizza evening, and bringing it from 400F on day 3 to 800 or more for another pizza night takes less than 30 minutes.

I cooked all last winter and plan the same this winter.

Chip

[jim81147]

Re: Joint finish ?

Al , my plan was to use regular concrete .

David and Chip , my plan now was to have 4 inches of cladding and 7 inches of loose perlite held between the cavity the outside wall and the cladding made . I am pouring the hearth tomorrow out of perlcrete . It is formed up at 5 1/2 inches thick .

[brickie in oz]

Re: Joint finish ?

Im still lost as to your term "cladding", to me it is a covering outside of the insulation in which the oven lives.