Exposing InsBlock 19 directly to oven interior Tools, Tips and Techniques Discuss Exposing InsBlock 19 directly to oven interior in the Pizza Oven Design and Installation forums; The InsBlock 19 is perfectly flat and level so I'm not planning on applying a fireclay paste under the floor ...

[kebwi]

The InsBlock 19 is perfectly flat and level so I'm not planning on applying a fireclay paste under the floor bricks (except for one that I put too much weight on and dented the InsBlock under it yielding a slightly tipsy brick, sigh.

I'm a little concerned that I shouldn't be exposing the InsBlock directly to a cooking oven via the cracks between the bricks. Is that a valid safety concern? Will it release any sort of vapor up through the cracks into the food?

I would strongly prefer not to remove the bricks and put down a layer of paste; I'm not sure I could ever get them perfectly placed again. I am considering squiggying fireclay paste (actually, I might as well use the copious firebrick mud from my saw) into the cracks without actually lifting the bricks out.

Is this necessary? Pointless? Noteably inadvisable for any reason?

Thoughts?

[Les]

Originally Posted by kebwi

I'm a little concerned that I shouldn't be exposing the InsBlock directly to a cooking oven via the cracks between the bricks. Is that a valid safety concern? Will it release any sort of vapor up through the cracks into the food?

If that is the case, a lot of us are doomed. I don't think a vapor is an issue. The bad element of the block is the fibers/dust it emits when it is disturbed. I don't see how a thin bed of fire clay will protect you much more than the ash that will soon fill your gaps.

Just my opinion (and I respect it )

Les...

[RTflorida]

As Les mentions, ash will soon fill all of the voids; Thats not to say there are no health concerns. But really, is there anything in our daily lives that does not pose some health problem to someone, somewhere? I say go for it and don't worry about it until a forum member mysteriously grows a third arm.

RT

[kebwi]

That would be useful.

[dmun]

Refractory insulations are designed to run at high heat. They are unlikely to produce any disagreeable outgassing like domestic insulations with their organic binders.

There would be nothing wrong with filling any cracks with firebrick powder, but as has been said, wood ash will do the same thing all by its self.

By the way, I have insblock19 under my oven floor, with no fireclay layer, and have never noticed any problem with it.

[jpar]

Insblock 19 and other fiber based boards - (Kfac, FBX 19 board, kaowool board, most ceramic fiber boards) are manufactured with organic binders. These binders (starches, latex) will burn off at approx 450 deg F. The vapors are not toxic, but they do smell! Once the biders burn off, there will be no further outgassing. Boards do lose strngth after binders burn off.

[dmun]

Here's a thread discussing this:

http://www.fornobravo.com/forum/f6/k-fac-19-a-3031.html (K Fac-19)