Duane's 42" Build

[Hamilton]

Hello,

The bricks were laid on a 50/50 mix of sand and clay.

[bencuch]

Hi Hamilton,

You have created a really beautiful building.
The floor bricks were glued to refractory concrete or laid freely on a mixture of brick and clay

[Hamilton]

I will give it a try.
Can somebody remind me of the formula for the render coating and the thickness?
I have 3" of insulation so I think I can go straight the the hard shell.

[UtahBeehiver]

I have seen some builders scoring or cross-hatching mating surfaces of bricks with an angle grinder and diamond wheel to reduce slippage and increase the mortar grab. May work here.

[Hamilton]

Hey all.
I have attached a few photos.
One of the sealer/adhesive used to secure the chimney pipe base to the firebrick, rated at a much higher temp than what we are using. It is rock solid.
My chimney cap made of the refractory castable separated from the mortar. I already had concerns about that area due to the temps at the time and the mortar did not have a chance to cure as a opposed to drying out. Needs some suggestions at this point on how to secure the cap to the chimney? The dome will be intersecting the backside of the refractory chimney cap due to poor planning.

[MarkJerling]

Looking great. Well done!

[Hamilton]

Good morning. Insulated the dome with 3" of blanket from our host at Forno Bravo and put the oven through five twelve hour days of drying fires. I ended up removing the perlcrete mixture around the base of the dome and used the blanket instead. It took me a minute but I found a crack in the dome that I was hoping to get lucky and avoid. Had a few of our kids, grandkids and one of the neighbors over for pizza yesterday afternoon. The best pizzas!!!

[Hamilton]

It is a shame!

[UtahBeehiver]

It is really a shame that all the pretty dome brick work will be covered by insulation. You are on the home stretch.

[Hamilton]

Hey guys, hope everybody is doing well!

I haven't had much time to spend with the oven lately.
Doing what I can in these couple of days off.
Attached are a few photos of the latest progress.
Ready for the insulation and render know I believe.
I will be cooking out of this oven before the end of the year.

[david s]

The highest rated silicone I could find is Permatex Ultra Copper, which I use in my builds. It is ok provided flames are not allowed up the flue pipe. After about ten years use the stuff remained intact and elastic until my wife killed it when firing up the oven and allowing flames into the flue pipe. It killed the silicon, so I had to redo it. No big dramas, but I sacked her from firing the oven.
There are other non silicone solutions, but all that I tried went hard and didn’t remain elastic meaning they didn’t seal against material that is expanding and contracting frequently.
If using it under an anchor plate I think that will be too hot for silicone. The seal on my build is quite a bit higher up and therefore cooler. In that position it wouldn’t matter if it goes hard because it will presumably be covered in insulation.

[Pizzarotic]

Any fireplace or flue supplier should have high temp product's. Most pure silicones are rated for 400-600⁰f but can handle a lot higher temps. Lavalock have a 1000⁰ tape and Vitcas do a 1800⁰ sealant.

[Hamilton]

Can anybody recommend a high temp adhesive/silicone to attach the chimney pipe anchor plate to the fire brick?

[Hamilton]

One more thing.

Look at all these excess cuts and "practice cuts".

[Hamilton]

I abandoned the concrete form for the supporting landing and went with a 3" wide and 5.5" tall support for the landing and around the perimeter of the oven. It is a 6 to 1 perlite and Portland cement mix. My hopes are to provide a bit of insulation around the perimeter as well as a backer of sorts for the floor bricks and fire clay and sand mixture between the castable and the floor bricks and to be a support for the quartzite landing and backer for the quartzite risers.

Some really weird stuff, I hope it works!

Attached is a few photos of todays progress. I mocked up the landing and the guy was able to sell me and will be cutting the piece of quartzite for the landing and the risers.

Any suggestions how to mortar or use an adhesive for the landing and risers to what I have done?