#21  
Old 08-14-2008, 09:35 AM
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Default Re: BrritSki's Build in Italy

More progress today, slow but sure.

First a bit of carpentry to make the wooden former that will support the entrance arch so that I had something to hold the entrance uprights in place. Then I made a load of 7.5 degree wedges.

First course was then mortared into place, but this was my first foray into using refractory mortar and following the instructions on the packet for the amount of water it turned out much too sloppy. Never mind, it wasn't too bad to work with for that first course.

Once that had set a bit I then placed the second course and mixed up some more mortar. I held off on the water this time and got a much more usable mix.

With the excess mortar I "plastered" the left hand side of the dome, but didn't have enough mortar left over to do the right hand side. Is it really necessary to plaster over everything - does it add significantly to the strength of the dome - or is a minimal mortar approach better ?

Ciao Rog
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BrritSki's Build in Italy-f1241-wedges-galore.jpg   BrritSki's Build in Italy-f1242-2-courses-right.jpg   BrritSki's Build in Italy-f1243-2-courses-front.jpg   BrritSki's Build in Italy-f1244-2-courses-left.jpg  
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  #22  
Old 08-18-2008, 05:36 AM
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Default Re: BrritSki's Build in Italy

Completed course 3 on Saturday and then more progress today with course 4 done and also the inner entrance arch.

Very lucky on that - I cut the corners off the 2 upright bricks just by eye and the arch then took 7 bricks exactly. It even stayed in place dry when I took the form away, but I put it back before mortaring up and will leave it there for a few days.

At least 1 more course this afternoon, but can't decide whether to start bevelling the brick edges or not on this course or the next. Will go and have another look and a measure and see what is best.

I did a quick spreadsheet to calculate the diameters (centimetres) of the top of each new course, but my measurements show that my actual diameters are less than calculated. Are my calculations wrong (reduction = sine of angle * brick height), or (more likely), are my wedges a tad more than 7.5 degrees ?

Brick height 5.8 Radius Crs Diam. Measured
Angle Radians Redctn 1 95.0
07.5 0.13089969 0.76 2 93.5
15.0 0.26179939 1.50 3 90.5 89.5
22.5 0.39269908 2.22 4 86.0 84.5
30.0 0.52359878 2.90 5 80.2
37.5 0.65449847 3.53 6 73.2
45.0 0.78539816 4.10 7 65.0
52.5 0.91629786 4.60 8 55.8
60.0 1.04719755 5.02 9 45.7
67.5 1.17809725 5.36 10 35.0
75.0 1.30899694 5.60 11 23.8
82.5 1.43989663 5.75 12 12.3
90.0 1.57079633 5.80 13 0.7


Ciao Rog
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  #23  
Old 08-18-2008, 08:04 AM
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Default Re: BrritSki's Build in Italy

Just completed the 5th course and decided to cut bevels on alternate bricks. Seems to work OK.

Any reason why I shouldn't continue doing this - seems too easy ???
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  #24  
Old 08-20-2008, 09:43 AM
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Default Re: BrritSki's Build in Italy

Yesterday wasn't great - 6th course went up OK, but then it was the dreaded 7th course and the bricks don't stay in place on the wooden wedges at that angle (surprise surprise !).

Played around with different things and got a couple of bricks to stay in place and started work on a polystyrene form, but had lots of interruptions (including Olympics - go Team GB!) and had to stop early as we were going out, so I didn't get it finished.

Today was a beach and shopping morning, and then lots of emails to deal with - organising a wedding in another country is fun - so another late start, but decided to try a different approach and it works.

As I'm sure all you experienced builders know (and it IS mentioned in the plans and lots of threads and I should have remembered from my brick-laying course), having damp bricks and sloppier mortar really helps, so I used a little hand sprayer on each brick and it's destination first, and then mortared them all in place individually, just using a thick stand-alone wooden form to hold it in place for a minute or so for the mortar to "grab".

Worked a treat, but ran out of cut bricks so closed down for the day, but when I measured the angle of the bricks on the 7th course they're almost exactly 45 degrees as they should be - hurrah !

Tomorrow should be an early start and I aim to finish the 7th course, finish the former and get a couple more courses done with the aim of finishing on Friday.

Wish me luck... Ciao Rog
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  #25  
Old 08-20-2008, 11:57 AM
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Default Re: BrritSki's Build in Italy

It's looking very good. When my courses got high enough to want to slip forward, I used an L shaped bracket, string and a brick- the bracket went over the edge of the brick, tied to the string, and the string was tied to a loose brick at the base of the oven. This held the newly mortared brick in place long enough to set, and then I moved it to another brick. I had three of these set up and it was plenty good enough until I got to the really vertical places, then I switched to using bamboo sticks to prop up the bricks.
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  #26  
Old 08-20-2008, 12:00 PM
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Quote:
Originally Posted by egalecki View Post
It's looking very good. When my courses got high enough to want to slip forward, I used an L shaped bracket, string and a brick- the bracket went over the edge of the brick, tied to the string, and the string was tied to a loose brick at the base of the oven. This held the newly mortared brick in place long enough to set, and then I moved it to another brick. I had three of these set up and it was plenty good enough until I got to the really vertical places, then I switched to using bamboo sticks to prop up the bricks.
Hmm, sounds like a good idea, but I've got most of the polystyrene former cut out now and only need to tape it together...

Maybe next time

Ciao Rog
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  #27  
Old 08-20-2008, 12:02 PM
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Default Re: BrritSki's Build in Italy

Way to go Rog,

Keeping your brick and mortar wet/damp is so important. Are you dunking them in the water as you work?

How about that Brit Olympic team -- ahead of Italy, France and Germany. Excellent.

James
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  #28  
Old 08-20-2008, 12:03 PM
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Default Re: BrritSki's Build in Italy

sorry, meant to attach a picture. I swiped the idea from someone else, can't remember who. He used a different shape clip, but the idea works well. Just don't trip on the brick counterweight!
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  #29  
Old 08-20-2008, 12:05 PM
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Default Re: BrritSki's Build in Italy

I was particularly impressed with the woman who was an alternate on the British equestrian team's performance in the eventing! What a wonderful job she did!
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  #30  
Old 08-20-2008, 01:13 PM
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Default Re: BrritSki's Build in Italy

Quote:
Originally Posted by egalecki View Post
sorry, meant to attach a picture. I swiped the idea from someone else, can't remember who. He used a different shape clip, but the idea works well. Just don't trip on the brick counterweight!
Since I wasn’t using mortar to hold the bricks in place, I used hot melt glue. But hey, it was good enough to hold them to the last course.

Les...
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