Mark's WFO

[exceloven]

Re: Mark's WFO

Thanks Amber, That sounds like plenty of time since they will all be cut and ready to set. Leaving now to go pick up my bricks. Starting to get exciting.

Mark

[amber]

Re: Mark's WFO

Oh! And congratulations on reaching this step! It's all downhill from there because you can actually see the thing being created!

[amber]

Re: Mark's WFO

If I remember correctly, it's maybe 30-45 minutes. One way or the other - you have plenty of time to set them out and then use a rubber mallet on the whole thing.

[Breven]

Re: Mark's WFO

Hey Mark-

Remember, there is no cement in this mixture- it doesn't set up like you think. It's more like playdough with sand in it. You'd need to work really, really slow for it to dry before you finish setting the floor.

If you are worried, spread the mixture a little at a time- maybe a foot or so, lay some brick then spread another foot or so and lay some more until you are done. That's how I did it.

[exceloven]

Re: Mark's WFO

Thanks guys, I have a question about my next step. How fast does the fireclay and sand mix set up. Will I have time to spread the whole floor and still make sure all the bricks are even.

Mark

[Les]

Re: Mark's WFO

Besides its a chemical reaction that sets it, so it doesn't really need air for it to dry.

It is true that it is a chemical reaction. But in order for it to dry, the water needs to evaporate ? that?s where the air comes into play. Here is a short article about the subject.

http://www.dri-eaz.com/VAULT/PR/DryingConcrete.PDF

Les...

[Justin]

Re: Mark's WFO

Mark i would suggest covering it and keeping it dry, the stuff is pretty porous and you don't want it getting full of water. Besides its a chemical reaction that sets it, so it doesn't really need air for it to dry.

[exceloven]

Re: Mark's WFO

James,
The science still stands! It did take exactly two bags but I only bought one the first time and had to run back to HD to buy a second bag.

Mark

[Bandrasco]

Re: Mark's WFO

Hi Mark,

I used the same mix; it just took a few days and really didn't shrink. It was firm but soft enough to dig into. It doesn't get hard like concrete, well at least mine didn't.

Looks like you're off to a great start!

[exceloven]

Re: Mark's WFO

Les,
It took a minute to understand! I have air to ONLY the top surface, because of the way I poured. That makes sense.

Mark

[james]

Re: Mark's WFO

I got the insulating layer poured today. I was surprised it took EXACTLY two bags of vermiculite. I wasn't short and had zero leftover.

Mark

I don't believe you. It's been scientifically proven to be impossible to actually buy the correct amount of any building material the first time. :-)

James

[exceloven]

Re: Mark's WFO

Les,
Thanks for the reply, I can always count on you. Yes, I used 5/1 mix. There definitely won't be a freeze, maybe a few sprinkles. Any idea on time to set up.

Mark

[Les]

Re: Mark's WFO

Mark - did you use the 5/1 mix? The fact that you only have air exposed to the top surface, I would think it will take longer than normal to dry. In regard to covering it, only if it's going to freeze or rain. I don't think the stuff is prone to crack (mine didn't anyway)

Les...

[DrakeRemoray]

Re: Mark's WFO

I have that same bucket! Now my question is what to do with the brick bits and my leftover 1/2 bricks...

I still have some of those brick pieces, a sample of the vermiculite concrete and a sample of the casting material I used for my vent on the potting bench near the oven. I call it "the museum", my wife says it is trash...
Drake

[exceloven]

Re: Mark's WFO

I got the insulating layer poured today. I was surprised it took EXACTLY two bags of vermiculite. I wasn't short and had zero leftover. I've heard it takes a while to set up. Any thoughts on how long I will have to wait till its set enough to work on, and should I keep it covered while it drys. Thanks all.

Mark