Need help from Concreters
Jan 26th 2008, 10:44 pm
#1
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Joined: Jan 2008
Posts: 11
Need help from Concreters
I am in the process of buying a property and looking to do an extension to it as soon as we move in.
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Jan 26th 2008, 11:05 pm
#2
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Posts: 7,444
Re: Need help from Concreters
I am in the process of buying a property and looking to do an extension to it as soon as we move in.
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
i bought a book here that gives great detail regarding all aspects of owner build.
when you put your drawings into the shire,there going to want engineers drawing so ,that will give you all you need to know.
i targeted a house here where i live,and have been watching every aspect of the build,i asked the builder if it was ok to keep popping on..
good luck to you..
ast
Jan 26th 2008, 11:16 pm
#3
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Re: Need help from Concreters
I am in the process of buying a property and looking to do an extension to it as soon as we move in.
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Cheapest cages would be if you ask for trench mesh cages. 4 bar 12mm is good.
Your slab would need at least 82 mesh, which is 8mm placed at 200mm centres.
Tying into exisiting slab, just get some 16mm dowels
Hope this helps, if you want specifics, ask more.
Last edited by Luke I Amyofath; Jan 27th 2008 at 1:09 am.
Jan 26th 2008, 11:29 pm
#4
youngy73
Joined: Mar 2005
Location: kewarra beach, cairns
Posts: 940
Re: Need help from Concreters
I am in the process of buying a property and looking to do an extension to it as soon as we move in.
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Jan 26th 2008, 11:49 pm
#5
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Re: Need help from Concreters
There are 2 ways to do your footings. first (and easiest if youre doing it yourself) is to get trench cages made up. 4 x 12mm reo, top and bottom, held togther with ligs (stirrups), of about 600mm centres.
Cheapest cages would be if you ask for trench mesh cages. 4 bar 12mm is good.
Your slab would need at least 82 mesh, which is 8mm placed at 200mm centres.
Tying into exciting slab, just get some 16mm dowels
Hope this helps, if you want specifics, ask more.
Cheapest cages would be if you ask for trench mesh cages. 4 bar 12mm is good.
Your slab would need at least 82 mesh, which is 8mm placed at 200mm centres.
Tying into exciting slab, just get some 16mm dowels
Hope this helps, if you want specifics, ask more.
ast
Jan 26th 2008, 11:58 pm
#6
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Re: Need help from Concreters
Sorry ast, Im just the production supervisor for a steel reinforcing company and can only tell you from experience about what we make for concretors / construction companies.
You want to build on top of a rock as opposed to earth ?
You want to build on top of a rock as opposed to earth ?
Jan 27th 2008, 12:16 am
#7
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Re: Need help from Concreters
yes mate,the whole of my plot is rock..
Jan 27th 2008, 12:21 am
#8
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Jan 27th 2008, 12:37 am
#9
Joined: Dec 2007
Posts: 2,838
Re: Need help from Concreters
I am in the process of buying a property and looking to do an extension to it as soon as we move in.
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
Can anyone out there help me with the setup of the concrete slab that i would need to do for something like this. Is it a strip foundation round the perimiter size of the extension with backfill to foundation hight and then just a slab over the whole area leaving 100mm outwith the slab on the foundation? What about the steel do i need it in the strip (if required) and what mesh size will i have to put in the slab itself, what thickness and strength does the slab and foundation (if required) have to be.
just one other thing, do i need to tie the new slab or strip found to the existing foundations for the house
http://www.byohouse.com.au/forum4/woodwork forum is the best search in home reno sectionhttp://www.woodworkforums.ubeaut.com.au/showthread.php?t=16763
Jan 27th 2008, 12:53 am
#10
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Re: Need help from Concreters
Your still gonna need soil tests AST.
Even if it is rock. We were or are on rock, and they need to prove that the rock isnt, friable, porous or just fill.
However, I think all the same rules apply, for the slab, just that you shouldnt need any piering !!
Just a fella with sharp teeth and a cheeky grin, as he extracts money from ya !
Even if it is rock. We were or are on rock, and they need to prove that the rock isnt, friable, porous or just fill.
However, I think all the same rules apply, for the slab, just that you shouldnt need any piering !!
Just a fella with sharp teeth and a cheeky grin, as he extracts money from ya !
Jan 27th 2008, 1:04 am
#11
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Jan 27th 2008, 1:06 am
#12
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Location: Terrigal, NSW.
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Re: Need help from Concreters
We can give all the ideas you might like like, but the engineer and the council have the final say, let them just tell you what yopu need and run with. You don't get a choice. If it falls down, its there problem.. Eamon.
Jan 27th 2008, 1:11 am
#13
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Re: Need help from Concreters
i have taken a pic of the front of the house with the double steel garage which wil be removed to accomodate the extension, it already has a slab there which is 100mm thick as far as i can see and prob at floor level of the house. i expect that this will have to be lifted but believe that the ground below will be ok, Would it be possible just to do a single slab with no strip foundationas around it and build on it or is the strip around the prerimiter a must here
Heres a pic of the front of the house
Heres a pic of the front of the house
Jan 27th 2008, 1:18 am
#14
Joined: Dec 2007
Posts: 2,838
Re: Need help from Concreters
Your still gonna need soil tests AST.
Even if it is rock. We were or are on rock, and they need to prove that the rock isnt, friable, porous or just fill.
However, I think all the same rules apply, for the slab, just that you shouldnt need any piering !!
Just a fella with sharp teeth and a cheeky grin, as he extracts money from ya !
Even if it is rock. We were or are on rock, and they need to prove that the rock isnt, friable, porous or just fill.
However, I think all the same rules apply, for the slab, just that you shouldnt need any piering !!
Just a fella with sharp teeth and a cheeky grin, as he extracts money from ya !
Jan 27th 2008, 1:28 am
#15
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Re: Need help from Concreters
i have taken a pic of the front of the house with the double steel garage which wil be removed to accomodate the extension, it already has a slab there which is 100mm thick as far as i can see and prob at floor level of the house. i expect that this will have to be lifted but believe that the ground below will be ok, Would it be possible just to do a single slab with no strip foundationas around it and build on it or is the strip around the prerimiter a must here
Heres a pic of the front of the house
Heres a pic of the front of the house
As other posters have said though, best get professional help onsite