K79 Oven Build

[Calisdad]

Re: K79 Oven Build

I have to thank you guys for posting- especially the pics. Going to make the leap into cutting more brick today and unless I have a good idea of where I'm headed I tend to stall.

Neil- where did you get your Duravent supplies?

thanks-
Calisdad

[boerwarrior]

Re: K79 Oven Build

Calisdad,

I got my Duravent parts from a fellow forum member who had some extra ones!

I myself actually have an extra 6" Stainless Steel Duravent mounting plate and also the 6" Stainless Steel cap (you would need to find your own chimney tube sections which you can buy from FornoBravo DuraVent UL103HT Chimney System).

I'm not sure if 6" is too small for you, however. Let me know if you are interested and we can probably work something out. We are both in CA

Neil

[K79]

Re: K79 Oven Build

I picked up my angle iron supports today from the local welder. I'm going to use 1/2" x 2" lag bolts with lag shields to fasten my angle iron supports to my hearth slab.

[ATK406]

Re: K79 Oven Build

Next...
3 coats 1/4" thick of Comproco Type S mortar mix to parge the outside
Build my outer arch
Wrap in insulation blanket
Then start my fires (2 weeks from now)

Is that mortar heat resistant? (i.e. will it hold up to the 600-700 degree temperatures that the outside of your dome will likely see during high heat saturation?). Maybe you can mix some lime and/or fireclay with it to increase it's thermal properties. I'm sure one of the resident experts will chime in.

Regards,
AT

[K79]

Re: K79 Oven Build

Is that mortar heat resistant? (i.e. will it hold up to the 600-700 degree temperatures that the outside of your dome will likely see during high heat saturation?). Maybe you can mix some lime and/or fireclay with it to increase it's thermal properties. I'm sure one of the resident experts will chime in.

Regards,
AT

I would love to hear what others have to say? The local mason at one of the largest precast companies in the state told me that it should hold up fine to the indirect heat on the outside of the dome.... That being said, I called Conproco and they told me that the temp shouldn't exceed 500 degrees??? What to do??

[boerwarrior]

Re: K79 Oven Build

Two birds with one stone...

I picked up my angle iron supports today from the local welder and in the background you can see my Conproco Type S parging mortar.

Wow those are some serious angle iron brackets!! I don't think you'll have any buttressing problems with those!

Neil

[K79]

Re: K79 Oven Build

Ok I've decided not to parge the outside of the dome for the following reasons:

1. Can't find a product that is made for this application
2. Not a huge consensus telling me it needs to be done
3. Not in the FB plans
4. Wasn't planning on wrapping it in wire first and since it's under tension not compression I don't feel it's going to do much for the oven or hold up.
5. It would really be squeezing me tight on my enclosure since I didn't plan on this thickness.

[MaineLotus]

Re: K79 Oven Build

Great build thread. The angle iron supports, is that a safety precaution or have some people experience failure (assume they go on each side of the arch)?

Noticed you're from Maine - good to see another builder from around here. I am around half finished with an indoor 32" build.

[K79]

Re: K79 Oven Build

Great build thread. The angle iron supports, is that a safety precaution or have some people experience failure (assume they go on each side of the arch)?

Noticed you're from Maine - good to see another builder from around here. I am around half finished with an indoor 32" build.

Thanks, and yes they go on both sides of my entry arch. I haven't read any threads where failure has occured here, but for the money I spent on this oven I'm not taking any chances haha

Yes, it is nice to see a fellow Mainer on here !! I'm by Augusta, you somewhat local or up in the county

[K79]

Re: K79 Oven Build

Ok, I'm working on my arch entry. I know it's not good to have joints line up. That being said, is it ok to line up the joints of my vent wall with my inner arch wall joints? They are independent of each other aren't they? The other option would be to get some 1/2 size firebricks or splits I think they're called and offset the joints if they need to be. They look offset in the photos by about 1/8" but that's obviously because I haven't put any mortar on them yet.

[kbartman]

Re: K79 Oven Build

Ok, I'm working on my arch entry. I know it's not good to have joints line up. That being said, is it ok to line up the joints of my vent wall with my inner arch wall joints? They are independent of each other aren't they?

Looking good K79. I would say brick on. I'm planning a thermal break with quite a large gap stuffed with ceramic rope for my outer arch. I plan on setting the outer arch directly on concrete hearth, although a quite tall chimney on top of it. I believe this will totally make them independent???

[stonecutter]

Re: K79 Oven Build

I would love to hear what others have to say? The local mason at one of the largest precast companies in the state told me that it should hold up fine to the indirect heat on the outside of the dome.... That being said, I called Conproco and they told me that the temp shouldn't exceed 500 degrees??? What to do??

Type S is a standard building mortar. The PSI rating (1800 ) is greater than Type N (750 ) because it has a higher OPC (ordinary portland cement ) content. It is no more heat resistant than any other mortar type or concrete which does not contain fire clay. Like any other type of cementitious cladding, it would need some kind of reinforcement for it to remain a structural elemnt.

[stonecutter]

Re: K79 Oven Build

Ok, I'm working on my arch entry. I know it's not good to have joints line up. That being said, is it ok to line up the joints of my vent wall with my inner arch wall joints? They are independent of each other aren't they? The other option would be to get some 1/2 size firebricks or splits I think they're called and offset the joints if they need to be. They look offset in the photos by about 1/8" but that's obviously because I haven't put any mortar on them yet.

It doesn't matter if they line up or not, other than personal preference. Neither arch is bonded to the other so, structurally, it is a non-factor.

Incidentally, the need for using steel to buttress the vent opening goes away if the walls are set in Rowlock or Header courses. You have taken things this far...I'm not saying it was a mistake to use steel, just that it can easily be done with masonry.

[K79]

Re: K79 Oven Build

Thanks for the info guys. I got one wall in this afternoon and plan on getting the other done tonight.

[K79]

Re: K79 Oven Build

Second wall up: