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Post by suitord on Jul 18, 2013 9:20:53 GMT
Pretty happy with last nights work, got a decent amount of the hearth bricks cut to shape.
Starting to think ahead a wee bit, so would be great if anyone has info on fire blankets, seems 50mm thick is the way to go, with chicken wire and vermicrete.
Things are a wee bit more difficult to source here in NI, as we don't have the same chains as you guys (Jewsons, Sheffield insulation etc) so I have to look around a bit more. (I know Liam at Kilnlinings deliver but min order £100)
This brings me to my question, I know the thickness but what size (width height etc) does my FB need to be? (36" dome)
Also if anyone planning a build in NI I can point them in the right direction for supplies, they only need to ask!
Thanks to all who have given info and words of support so far.
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Post by cannyfradock on Jul 18, 2013 12:52:17 GMT
Suitord
Excuse my ignorance but didn't understand... "This brings me to my question, I know the thickness but what size (width height etc) does my FB need to be? (36" dome)"....
The width needs to sit under the complete hearth so if your hearth sits inside the first ring of the dome you will need 36" plus a half brick x 2...= 45"....by height do you mean how high from floor level?... if so then you need to calculate back from your finished hearth height......which is usually set at elbow height of the oven user.
Do you think we need a separate "Irish section" for sharing info to our members both North and South of the border in Ireland?
Terry
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Post by suitord on Jul 18, 2013 22:21:51 GMT
Hi Terry, Thanks do getting back to me, sorry if I was talking in circles. My actual question was about insulation. I was hoping to find out what size of ceramic fire blanket (which I shortened to FB causing the confusion maybe) I needed for under the vermicrete. I thick 50mm is the normal thickness, but was hoping someone could point me in the right direction for the other dimensions, so that I don't get one too small, or one were I have 30 feet of ceramic fire blanket left over....
I regards to an "Irish section" maybe I could post a thread in the materials section with places I have found and others could post on that thread... I don't feel we need a whole other section, but if anyone else has any views on this I guess they could make them known
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Post by cannyfradock on Jul 21, 2013 9:18:21 GMT
Suitord I use the 50mm roll of body soluble blanket from Kiln Linings.... kilnlinings.co.uk/lbp-ht-insulation-blankets/lbp-ht-blanket-1200gd-3.66m-610-x-50mm-density-96kg ......it works well for me but it's only just enough to cover a 90cm internal sized oven. The Americans use between 50mm and 100mm blankets. I'm nor sure how much more benefit you get from that extra 50mm....the more the merrier I suppose. Other members have also used 25mm thermal blanket and they say it works well?? I'll leave the "Irish section" open for comment before I do anything. Terry
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Post by spinal on Jul 21, 2013 9:28:04 GMT
I have 25mm blanket, + about 1foot of vermiculite (loose). On the edges, that goes down to about 6" of loose vermiculite... seems to work well, haven't had any heat coming through the outside of the side bricks at the thinner point...
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Post by suitord on Jul 22, 2013 15:44:13 GMT
Thanks for the info guys, much appreciated! Got my hearth laid and the soldier course of half bricks laid. The homebrew is different to work with than ordinary mortar. Attachments:
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Post by dunnes2002 on Jul 23, 2013 11:26:16 GMT
nice picture, how did you cut your bricks? are they flush to the soldier layer or are there gaps? Im just questioning because im a couple of steps behind you and cant decide whether to cut the bricks with straight edges and put the soldier layer around them (leaving small gaps as straight v curve doesnt match) or build the hearth slightly bigger and start the dome on top of the hearth.
Hope that makes sense.
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Post by suitord on Jul 23, 2013 21:42:01 GMT
Hi Dunnes2002 I cut my bricks using a 115mm angle grinder (4.5 inch) and a brick bolster. I laid the hearth, then put template on it, marked it and cut bricks to shape. As I cut them, I put the off-cut into the herring bone further round and re-marked them so I saved on bricks. I marked each brick on 4 sides using the template and a set square, then cut a trough in each side, hit it a whack with the bolster and smoothed any rough bits freehand with the angle grinder. I laid the hearth first on a bed of homebrew. From what i read seem to be 50/50 on wet or dry laying so I did the one I thought easiest. I then laid the soldier course around that leaving about a 7.5mm gap all the way around (did this by eye) and raked out the wee gap with an even wee'er stick to remove excess homebrew. From what others have said the gap leaves a bit of expansion room and will fill with ash with allows this. Have posted 2 picks below which hopefully show a bit of this process and also will pop on 1 that shows everything so far. Hope this makes sense! Attachments:
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Post by suitord on Jul 23, 2013 21:42:35 GMT
next pic!! Attachments:
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Post by suitord on Jul 23, 2013 21:43:14 GMT
overall build so far Attachments:
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Post by dunnes2002 on Jul 23, 2013 22:07:19 GMT
Thanks for that suitord, I've got a 230mm grinder which may be a bit big for accurate curves but if I leave a gap for expansion that shouldn't matter too much. Ordered extra bricks so we will see how it goes
Might have to make some sort of jig too to hold the brick while I cut it!
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Post by suitord on Aug 9, 2013 12:40:21 GMT
Been working so hard on my oven, haven't had time to post. Just finished dome last night, now to work on external arch and chimney. Feel I've finished now dome is built, but know there are weeks of work left! Ah! Attachments:
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Post by suitord on Aug 9, 2013 12:41:57 GMT
A shot of the internal, needs tidying, not as neat as mark from Cornwall. Should stay up though. Attachments:
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Post by rockrocky on Aug 9, 2013 16:48:03 GMT
So far so good, well done.
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Post by suitord on Aug 19, 2013 12:37:36 GMT
I have got my entrance arch built and chimney on, and hope to start small kindling curing fires tomorrow. I have to finish a bit of the base on one side, and then it should be blanket and vermicrete at the weekend! I was reading Terry's render advice on the Cornish Pompeii thread. I also seem to recall he had words of wisdom on finishing the external coat on another thread a while back but I can't remember what it was - perhaps if anyone has ideas on making a good finish they will share. Also how do you "scratch" a "scratch layer" Attachments:
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