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  #11  
Old 10-22-2013, 04:05 AM
hodgey1's Avatar
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Join Date: May 2013
Location: NW Pennsylvania USA
Posts: 295
Default Re: Finally started

You may have the cutest helpers on the planet. I used 1/2" rebar on 12" centers for my hearth slab.
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  #12  
Old 10-22-2013, 05:11 AM
Peasant
 
Join Date: Oct 2012
Location: Minnesota
Posts: 43
Default Re: Finally started

Your helpers will have trouble handling anything bigger than 1/2" rebar and that would be overkill anyway.
Twelve O.C. like Chris says, tie wire the intersections and support so they stay centered in the slab. You could double up vertically on the parimeter for good measure.
John
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  #13  
Old 11-02-2013, 01:50 PM
mnl mnl is offline
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Join Date: Sep 2013
Location: Brisbane
Posts: 69
Default Re: Finally started

Thanks hodgey1 and John.

I haven't made much progress recently. I got the hole dug, form work, reo cut to go around the pipe a bit over a week ago, etc and now it is just sitting there waiting for the contractor who is doing it. I'm getting him to do the pour that slab as he is here doing other work, but will do the top one myself.

While I have been waiting, I have been trying to gather some materials. Yesterday I got the rest of the grey blocks I need and have a test stack started in the garage. Got some refractory slab (300 x 300 x 50) for the floor and 50 fire bricks (only got 50 while I was there as that made 400kg in the trailer which was heavy enough). The plan for today is to get the rest of my materials like reo, fibre cement sheeting etc.

For those that lay their slab on fibre cement sheeting, how thick did you use? If you used 6mm, did you just support it from below as I did not think it would take the weight (while the concrete is setting)? Alternately, I could use 15mm?

Will post some photos of my (lack) of progress later.

Mark
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  #14  
Old 11-02-2013, 05:13 PM
Laborer
 
Join Date: Oct 2013
Location: sydney
Posts: 95
Default Re: Finally started

Hi Mark,
I think it would be cheaper to use timber than cement sheeting.Easier to cut and you wont have to worry as much about the airbourne fibrous material.If you go for the cement sheeting i'd go 15 mm.
In both cases you'll need some sort of support below if you're doing a 100mm slab.Some 4x2's maybe 300-400mm apart in both directions supported by what ever you can find,i used some blocks and pieces of small timber which i could knock out later to dismantle the whole thing.It's better to be safe when working with a lot of weight.
Regards John.
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  #15  
Old 11-02-2013, 07:42 PM
cobblerdave's Avatar
Il Pizzaiolo
 
Join Date: Jan 2010
Location: brisbane australia
Posts: 2,339
Default Re: Finally started

Gudday
I take it your using the cement sheet so that you don't have to remove it later?
Even if this is the case I'd still put some support in. 3 x2 untreated pine would be fine, double up if you don't think they be strong enough. It will make good kindling later .Screw together with chipboard screws and battery drill,leave the heads out so you can get to them later. Don't forget to tape all joints and edges least the cement bleeds through.
Hope something here might help
Regards dave
Forgot to add make sure your screws are pointing in a direction you can get them out later when the slabs on top
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Last edited by cobblerdave; 11-02-2013 at 07:56 PM. Reason: Add point
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  #16  
Old 11-03-2013, 12:03 AM
mnl mnl is offline
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Join Date: Sep 2013
Location: Brisbane
Posts: 69
Default Re: Finally started

Quote:
Originally Posted by cobblerdave View Post
Gudday
I take it your using the cement sheet so that you don't have to remove it later?
Hi Dave

Yes you are right that it will not come out. In fact there is a section that will never see the light of day again as my base is a square "A" shape. It was suggested to me today I should put a time capsule in there, just need to think what to put in the time capsule. Maybe a Britney Spears or Michael Jackson song, a Queensland 8 in row paper, a picture of the family? Open to other suggestions.

Any I digress, the section that will never see light again is 1,170 x 780mm. I was thinking of using 3 lengths of angle to across this section as well as the perimeter being on blocks should be enough support.

The front section which is open I could do with either ply or cement fibre, thought I would go cement fibre given I have to use that at the back.

Thanks for tha taping tip, I probably would have forgotten that one.

John - I have a fair bit of ply laying around from previous jobs and some planks I can use as support, therefore maybe I should rethink using that for the front section as I agree the fibre cement sheeting is expensive. SWMBO would also be happy for me to use some of the old timber I have laying around.

Got a heap of 12mm reo bar today, some corners and also wire to tie up. Needed a fair bit by the time you put if down a couple of the cores and then a grid in the slab. I have probably gone overkill but would prefer to do that than have not enough hand it fall down.

Mark
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  #17  
Old 11-03-2013, 12:22 AM
mnl mnl is offline
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Join Date: Sep 2013
Location: Brisbane
Posts: 69
Default Re: Finally started

A couple of photos of my trial stack. This shows the time capsule (the closed bit).
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  #18  
Old 11-03-2013, 12:34 AM
mnl mnl is offline
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Join Date: Sep 2013
Location: Brisbane
Posts: 69
Default Re: Finally started

Another one
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  #19  
Old 11-03-2013, 12:36 AM
mnl mnl is offline
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Join Date: Sep 2013
Location: Brisbane
Posts: 69
Default Re: Finally started

Form work ready for slab tomorrow
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  #20  
Old 11-03-2013, 12:41 AM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,756
Default Re: Finally started

If you've not had any bricklaying experience, it is easier to mortar the first course to get it perfectly level then glue the subsequent courses of blocks together with something like Sikabond. It will be quite strong enough as you will be filling some of the cores anyway. I use the odd washer here or there to true up the levels. Once finished the thing can be bagged or rendered.
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