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  #51  
Old 08-22-2013, 07:07 PM
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Default Re: 30"/760mm Scotland Pompeii

Before going any further cover thos gaps between the floor and the dome. You do not want those filling with mortar, it is fine if they fill with ash later but for now get some paper in there and tape it off.
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  #52  
Old 08-24-2013, 02:40 PM
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Default Re: 30"/760mm Scotland Pompeii

The weather yesterday was pretty bad so all I could get done was cutting my stainless steel tube to size and packing it with CaSil.

Today I cut the arch soldiers and linked them with the second soldier course. Linking it up was fun due to my earlier rotation error. My oven's internal diameter has grown by 1", shoddy workmanship

I cut my arch form and was going to cut arch bricks, but then I realised its probably best to let the arch soldier mortar set before I put any weight on it.


Has anyone cut their dome bricks on three sides to reduce the mortar gap? It occurred to me today because I have all this fire-cement mortar to use I will have to pack the gaps with pieces of brick. I was already planning to taper the sides to eliminate inverted Vs.
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30"/760mm Scotland Pompeii-img_0646_1200x900.jpg   30"/760mm Scotland Pompeii-img_0649_1200x900.jpg   30"/760mm Scotland Pompeii-8yctare.jpg  

Last edited by jms; 08-24-2013 at 02:42 PM.
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  #53  
Old 08-24-2013, 03:06 PM
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Default Re: 30"/760mm Scotland Pompeii

I don't think anyone bothers to cut the tops/bottoms. Just the compound cut on the sides.

If you are cutting the sides, the only gap you will have is at the back, and my experience is that you don't need to use any brick chips to hold the bricks apart. The angle is a pretty constant 5 degrees or so, which the mortar will easily fill in. Your joints at the back don't have to be all that neat - but for appearances sake I used a jointing tool on the mortar on the backs and that was all it took.
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  #54  
Old 08-24-2013, 04:20 PM
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Default Re: 30"/760mm Scotland Pompeii

Jms
Watch those small brick slivers (chips) better to adjust several bricks than install a narrow one. This is due to mortar creep i mentioned earlier. But a good start.
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  #55  
Old 08-24-2013, 05:13 PM
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Default Re: 30"/760mm Scotland Pompeii

Quote:
Originally Posted by deejayoh View Post
If you are cutting the sides, the only gap you will have is at the back, and my experience is that you don't need to use any brick chips to hold the bricks apart. The angle is a pretty constant 5 degrees or so, which the mortar will easily fill in. Your joints at the back don't have to be all that neat - but for appearances sake I used a jointing tool on the mortar on the backs and that was all it took.
A 5 degree angle would equal a mortar gap of 10mm. My premix fire-cement recommends a maximum mortar gap of 5mm. I'll try a test on some offcuts and see how it goes. My main worry is the mortar not setting quickly enough to prevent them slipping down from gravity, and being strong enough to support the next course within 24hrs.
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  #56  
Old 08-25-2013, 12:52 AM
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Default Re: 30"/760mm Scotland Pompeii

Quote:
Originally Posted by jms View Post
A 5 degree angle would equal a mortar gap of 10mm. My premix fire-cement recommends a maximum mortar gap of 5mm. I'll try a test on some offcuts and see how it goes. My main worry is the mortar not setting quickly enough to prevent them slipping down from gravity, and being strong enough to support the next course within 24hrs.
Two thoughts: 1) the recommended gap is for a fireplace, not a dome. For a dome, your gap is going to be 0 mm at front and 10 mm at back, so I guess that's 5mm avg?
2) I'd use home brew. you will save money, and I think it's easier to work with!
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  #57  
Old 08-25-2013, 02:52 AM
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Default Re: 30"/760mm Scotland Pompeii

Quote:
Originally Posted by deejayoh View Post
Two thoughts: 1) the recommended gap is for a fireplace, not a dome. For a dome, your gap is going to be 0 mm at front and 10 mm at back, so I guess that's 5mm avg?
2) I'd use home brew. you will save money, and I think it's easier to work with!
If I could un-buy the stuff I've got, I would. But I've got two 25kg tubs and no other use for it.

I'll try mortaring some offcuts together and see how it goes.

Last edited by jms; 08-25-2013 at 02:57 AM.
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  #58  
Old 08-25-2013, 12:44 PM
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Default Re: 30"/760mm Scotland Pompeii

A 10mm mortar gap seems to be fine, the offcuts I put together could support a load after an hour without the mortar squeezing out, and a couple of hours later it was pretty solid.

Today I got most of my inner arch cut. Although I ran out of time before I could stick it together.
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  #59  
Old 08-25-2013, 02:08 PM
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Default Re: 30"/760mm Scotland Pompeii

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Originally Posted by jms View Post
If I could un-buy the stuff I've got, I would. But I've got two 25kg tubs and no other use for it.

I'll try mortaring some offcuts together and see how it goes.
You may go through that pretty quickly. I think I went through an 80lb bag of dry (which I would guess is about the same as your two tubs of wet) in about 3 courses. I couldn't stomach the cost of another bag, so switched to home brew at that point. I preferred working with the home brew, once I got the right sand (super fine)

but you shouldn't have any issue with the 10mm gaps at the back. Once the oven is done, the mortar just holds the bricks apart - it doesn't provide any structural "glue"
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  #60  
Old 08-25-2013, 06:29 PM
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Default Re: 30"/760mm Scotland Pompeii

Using the home brew with extra fine sandblasting sand I made it to the final chain without them dropping. Make sure you dampen your bricks prior it will help the draw of water from the dryness maybe you might have to hold it in place for a minute or two it's really not a big deal you can always use the it loosen it a bit and use a wedge to tighten it up its tough to remove it to the next brick at that height
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