NW Ohio Build - Opinions welcome

[gugahulk]

Re: NW Ohio Build - Opinions welcome

Transitioning to opening--heigth at 64% (9" / oven at 14"). I cut the brick close to 45 degrees and plan on using the left over cuts on top to seal gaps--see photos.

Looking good, mine I did 9" door and 14.5" making a perfect 63% ration. Any plan on buttressing?

[perrysburg]

Re: NW Ohio Build - Opinions welcome

Transitioning to opening--heigth at 64% (9" / oven at 14"). I cut the brick close to 45 degrees and plan on using the left over cuts on top to seal gaps--see photos.

[gugahulk]

Re: NW Ohio Build - Opinions welcome

Yeah, laid them out dry with shims in place and then measured and cut/grinded center piece, disassembled, mortared end pieces, reset rest in place with shims and then used mortar bag to fill spaces.

Thanks BTW for the compliment. -A

My friend, its looking awesome! Keep up the good work can't wait to see how its going to turn out. I just closed my vault yesterday. It is a good feeling you will see...

[perrysburg]

Re: NW Ohio Build - Opinions welcome

Yeah, laid them out dry with shims in place and then measured and cut/grinded center piece, disassembled, mortared end pieces, reset rest in place with shims and then used mortar bag to fill spaces.

Thanks BTW for the compliment. -A

[gugahulk]

Re: NW Ohio Build - Opinions welcome

2nd row done! And the first row held without forms

Wow, they look great! Good job! How did you make your joint so perfect? you set them dry and than put mortar? I can not get that perfect alignment that you got. Very good job. Keep it up!

[perrysburg]

Re: NW Ohio Build - Opinions welcome

2nd row done! And the first row held without forms

[Tscarborough]

Re: NW Ohio Build - Opinions welcome

Most product specifications will provide compression data, thermal expansion data, and some will have rebound data. For what we do here, a compression strength of a couple of hundred pounds is more than adequate for buttressing even the most extreme dome, provided that the thermal expansion is low (which it will be), and it has enough rebound to maintain congruity to both sides of the structure.

[Gulf]

Re: NW Ohio Build - Opinions welcome

Oh, I thought you meant actual rigid insulation. I think you've totally lost me in your description, etc., anyway. I guess the part I don't get is....if there is any type of insulation that compresses, even a little, separating the oven from a buttress, how can the buttress do it's job effectively? Don't misunderstand me.....I'm not saying it can't, I just must be missing something. Obviously.

Sorry for the confusion. I just did a search on the term "rigid insulation" and sure enough, the first hit was for Owens Corning Foam . Again, very sorry for the confusion .

I can't see a "firm" insulation layer "separating" from the buttress, if the buttress is on the outside of the insulation layer. I can see where the brick (expanding during the first few heat cycling) could compress the insulation a little. But, as the oven cools the pressure on the insulation would relieve. Unless something else takes up this area, the next time it is cycled, the expansion of the brick will only get back to the limits that were set by it's first full clearing.

If, any of the most commonly approved firm insulation (which are normally used for under the oven floor) are used between the oven and a well constructed buttress, there should be no catastrophic failures.

[NCMan]

Re: NW Ohio Build - Opinions welcome

I know that I did not specify them, but I was thinking of CalSil, CF board, V or Pcrete to separate the oven from the buttress. At least, that was what I was referring to as "rigid", as compared to the cf blanket. A WFO shouldn't see temperatures anywhere close to their melting points. Also, I envision the buttressing as being outside of the primary insulation layer. Far away from the extreme heat.

Oh, I thought you meant actual rigid insulation. I think you've totally lost me in your description, etc., anyway. I guess the part I don't get is....if there is any type of insulation that compresses, even a little, separating the oven from a buttress, how can the buttress do it's job effectively? Don't misunderstand me.....I'm not saying it can't, I just must be missing something. Obviously.

[Gulf]

Re: NW Ohio Build - Opinions welcome

I know that I did not specify them, but I was thinking of CalSil, CF board, V or Pcrete to separate the oven from the buttress. At least, that was what I was referring to as "rigid", as compared to the cf blanket. A WFO shouldn't see temperatures anywhere close to their melting points. Also, I envision the buttressing as being outside of the primary insulation layer. Far away from the extreme heat.

[NCMan]

Re: NW Ohio Build - Opinions welcome

In this application, not to the point that it would loose it's insulation value.

I get what you mean. One thing I would be concerned w/regarding rigid insulation is..... if it is touching or even close to steel (if steel buttress is used) is how it will take the heat? Some kinds of rigid insulation can be toxic when melted. Just throwing that out there. This is all just hypothetical, of course. Just askin'.

[gugahulk]

Re: NW Ohio Build - Opinions welcome

it is cement board. I saw it used in another thread. It made sense to me that it would more evenly disperse the weight of the firebricks on top of the foamglass. The foamglass is brittle and the cement board protects the foamglass from damage while lying the brick--hope that makes sense. -A

I was thinking on using the same thing when I started, However if you do a burn test on them they actually catch on fire. I did it and my got on fire in 10 sec. The little threads that are in side of the cement board will catch on fire if exposed to open flame. Try it you will see what I mean. I just got a small blow torch and put on it and it was instant. I guess once the threads are burned out you should be ok. Hope this helps you.

[Gulf]

Re: NW Ohio Build - Opinions welcome

Are you saying that rigid insulation doesn't compress?

In this application, not to the point that it would loose it's insulation value.

[NCMan]

Re: NW Ohio Build - Opinions welcome

I think that I would figure in using a rigid insulation for the flat side walls. No compression to worry about. No heat transfer to what ever buttressing is used.

Are you saying that rigid insulation doesn't compress?

[Gulf]

Re: NW Ohio Build - Opinions welcome

I think that I would figure in using a rigid insulation for the flat side walls. No compression to worry about. No heat transfer to what ever buttressing is used.