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Post by bookemdanno on Sept 17, 2012 12:21:23 GMT
Chimney transition, venty, flue type thingummy now in place! Starting to look like a real oven now! Raked out the main crack in the oven arch and repointed it whilst i was down there. But here's how i finished up the vent from the inside. I gave up on the stove rope idea, that's now going to be used in the door. I didn't like the vent bricks only being mortared on one face, so i pointed the gap between the oven and vent with a mix of fine Vermiculite from the Garden Centre and Hydraulic Lime. At least it should have some insulation properties and stop too much heat drawing from the oven brickwork. I'll post a separate thread i think, but can anyone stopping by let me know roughly (say in hours) how long it took them to get the blankets, Vermicrete and final render coats on, please? i say hours, as it'll help me think about how i can fit in the stages. I'm in two minds whether to stick, or go for it before the winter, you see! Thanks!
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Post by h12rpo on Sept 17, 2012 16:27:35 GMT
I love your vent flue chimney thingy - where can i get one ?
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petec
WFO Team Player
Posts: 232
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Post by petec on Sept 17, 2012 17:38:31 GMT
great shots of the vent - very informative .
Great build too !
Definitely go for it before winter if you can - think of the Roast Turkey !!
Cheers Pete
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Post by cannyfradock on Sept 17, 2012 17:42:14 GMT
Danno
Great pics. I really like the way you fashioned your vent. I've seen this style used a few times before and looks stronger that the outer arch directly against the inner arch....if you get my meaning.
I've used 5mm fibreboard to fill the gap between inner and outer arch but fine vermiculite and lime sound perfect for this.....I'm still learning.
In all honesty I would allow a full day for each of the insulation, vermecrete and render stages. I tried doing the insulation, chicken wire and vermecrete in the same day, but because I rushed the insulation layer I had a tricky time trying to get the chicken wire to sit tight on it. When I started adding the vermecrete the insulation layer (because I rushed the chicken wire) kept wanting to spring out from the dome. I got there in the end but next time I will allow myself seperate days for these stages.
Terry
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Post by bookemdanno on Sept 17, 2012 21:04:06 GMT
Thanks Guys!
R2D2- Good Ol Ebay for the enamel woodburner flue 8", and i made the rain cowl myself from a storage heater front panel.
Pete- we're on the same wavelength there my man! Exactly what i had planned.
Terry - thanks for your help. My Rockwool has the Wire already around it. Seems easier, but i'm expecting a fight, and some bloodflow. Heavy old stuff too! I think i'm leaning towards a dip for the line and completion!
cheers!
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Post by Fat Bob on Sept 17, 2012 21:11:45 GMT
That's a goodlooking oven - well done.
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Post by bookemdanno on Sept 27, 2012 17:01:36 GMT
Thanks Bob, i am pretty impressed by it! Not a lot has been a hap'nin, apart from staring out of the kitchen window planing how to do next bit and knocking up a couple of wooden peels. But just a few minutes ago i whacked on the first layer of insulation blanket. I lucked out on Freecycle a few months...well about 6 months ago and grabbed some 20mm Ceramic Blanket and the insulation bricks from a kiln. Just about enough!! I rolled it out around the base of the dome, pinched the extra bits together then cut darts from the top down, just past half way, then folded the big bit under the cut, marked with a felt tip and cut the section out. Simples..snick, snick! The silver tape is some foil insulating tape i had left over from a job, which had just enough stick to do what i wanted it to. Which was just stop it opening up and keeping the top bit in place for now. Next bit is the Rockwool Fire Blanket. Laters!
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petec
WFO Team Player
Posts: 232
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Post by petec on Sept 28, 2012 17:42:26 GMT
looking great to me !
really like the arches and flue solution
cheers Pete
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Post by bookemdanno on Oct 2, 2012 12:14:36 GMT
Had a wrestle with some Rockwool over the weekend. Its a lot more flexible than Ceramic Blanket, even with stitched in Chicken wire. Itchy too! Then i primed the surface with a mix of Hydraulic Lime and Kiln dried sand, mixed to a masonry paint type consistancy and applied with a brush, This has now dried to a crust, which can be pushed in with a finger, but i'm hoping will provide a level of surface suction to help the vermicrete stay in place. Through using both, i'd say that the Ceramic Blanket is easier to use, and has less give but the Rockwool could maybe be a better insulation due to the ability to trap more air within the fibres. However the Ceramic Blanket can tolerate a higher heat level and therefore more suited to being beside the bricks. It's as we say in EA "iss a case of six an too frees ra-lee". Vermiculite layer next! Any tips?
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Post by faz on Oct 2, 2012 20:58:56 GMT
Take a look at my thread - there's some pics of vermiculite and a description of how I put it on. Worked for me anyway!
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Post by h12rpo on Oct 3, 2012 7:34:30 GMT
Is that the rockwool 50 ? Just wondering, cos it looks a really neat wrap - thats what i'm going to use and whilst its still rolled up in my shed waiting or the build, it looks like its not easy to handle
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Post by bookemdanno on Oct 3, 2012 12:17:35 GMT
Its Rockwool Fire Barrier Roll, that's all i know it as. 1m x 4m 50mm thick with a stitched in Chicken Wire reinforcement. Higher rated than normal Rockwool Insulation, and is used to provide a 30-60minute fire stop. It's itchy, but not like fibreglass and very flexible which makes it actually harder to use as it flops about quite a bit. I rolled it around the oven, and then cut darts out of it, but i was thinking of cutting large triangles, and then stitching them together.
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Post by bookemdanno on Oct 4, 2012 12:24:37 GMT
getting frustrated with spending all day inside, at work, during daylight to end up with nothing fun to do when i get home, so i set up the Gazebo with a 500w Halogen lamp. Last night i got down and dirty with "satans oatmeal" for an hour or two. and took a photo this morning of my first layer... You can see my profile to get the oven back in shape, set at TDC and rotates around a bolt resting on the oven brick. I've also made a curved wooden "trowel" or darby about 400mm long x 100mm, like a curved wooden plastering trowel. I hold this with the bottom edge overlapping the previous layer, then fill from above tamping lightly with the edge of my gauging trowel. Then lift the darby away, and check at points with the rotating profile, which can both tamp and scrape. It seems to be working well so far. My modified Vermicrete is a lime based lightweight insulating render, again nabbed off of Freecycle, mixed with Vermiculite at about 1:4 ratio. I initially worked an 1:8 ratio but it collapsed too readily, as it's not a pure binder like if using OPC or NHL. Hope to complete tonight!
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Post by h12rpo on Oct 4, 2012 14:38:17 GMT
Need a better description and more photos of those tools / formers mate :-)
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Post by bookemdanno on Oct 4, 2012 14:53:28 GMT
I'll take a piccy tonight!
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