Due to possible bad ground conditions, I may have to use a raft foundation
in my 25sq M, single storey, flat roof extension. I was wondering whether I
could tackle the steel reinforcement which involves having a 400mm x 6M
long, sq box made out of A142 mesh and marrying it with sheets of A142 mesh
and various lengths of 12mm ms bars. I' ve seen guys on building sites
twisting thin wire around steel mesh etc, but how do you bend the bars and
what kind of overlaps are required? Anyone have any experience or advice to
impart?

I refer to the following site:
http://www.nuneatonandbedworth.gov.u...es/default.asp No2 Raft Foundation


Cheers
Don

Go to a reinforcement supplier and if you give them exact dimensions, they
will cut,bend an deliver for you. They will provide the 12mm bars and a roll
of soft iron tie wire to tie it all up.
On construction sites mesh can be sandwiched between 2 planks and bent with
an excavator bucket-you won't do it by hand.
Good luck if you have to go for a raft.
"Don" popple @diddle .dot wrote in message
...
Due to possible bad ground conditions, I may have to use a raft foundation
in my 25sq M, single storey, flat roof extension. I was wondering whether
I
could tackle the steel reinforcement which involves having a 400mm x 6M
long, sq box made out of A142 mesh and marrying it with sheets of A142
mesh
and various lengths of 12mm ms bars. I' ve seen guys on building sites
twisting thin wire around steel mesh etc, but how do you bend the bars and
what kind of overlaps are required? Anyone have any experience or advice
to
impart?

I refer to the following site:

http://www.nuneatonandbedworth.gov.u...tes/default.as
p No2 Raft Foundation


Cheers
Don

In message , Don
writes
Due to possible bad ground conditions, I may have to use a raft foundation
in my 25sq M, single storey, flat roof extension. I was wondering whether I
could tackle the steel reinforcement which involves having a 400mm x 6M
long, sq box made out of A142 mesh and marrying it with sheets of A142 mesh
and various lengths of 12mm ms bars. I' ve seen guys on building sites
twisting thin wire around steel mesh etc, but how do you bend the bars and
what kind of overlaps are required? Anyone have any experience or advice to
impart?

I refer to the following site:
http://www.nuneatonandbedworth.gov.u...cenotes/defaul
t.asp No2 Raft Foundation


Hi,

If I understood and read it correctly, the link you gave (doc 2 - raft
foundations) specifies the overlap at 450mm (point 11 at the bottom of
the list).

Bending 12mm rebar - no idea :-) Hopefully someone else will have an
answer for that. My only thoughts were Oxy Acetlyene to heat it enough
to allow bending. That would be fine for 12mm rebar alone, but in a mesh
I'm not sure.

Hth
Someone

Don Wrote:
Due to possible bad ground conditions, I may have to use a raft
foundation
in my 25sq M, single storey, flat roof extension. I was wondering
whether I
could tackle the steel reinforcement which involves having a 400mm x
6M
long, sq box made out of A142 mesh and marrying it with sheets of A142
mesh
and various lengths of 12mm ms bars. I' ve seen guys on building sites
twisting thin wire around steel mesh etc, but how do you bend the bars
and
what kind of overlaps are required? Anyone have any experience or
advice to
impart?

I refer to the following site:
http://tinyurl.com/c9y96 No2 Raft Foundation


Cheers
Don

You would have to get the steel ( re-bar) from a specialist steel
merchant who can easily supply what you need, but would normally work
to a steel schedule which will specify each different type of
re-inforcement including bar size, lengths, shape code (ie bending
recquired) and number of bars.
Having said that, if you have to go for a raft then the local council
Building Control peeps will definately recquire engineers drawingg,
calcs and specs and the engineer would then normally supply you with
this schedule as part of the design.
The "steel fixing" itself is not too difficult as long as you take your
time and make sure everything is in the right place, you can set the
re-bar on small moulded plastic blocks (or concrete (ie broken paving
slabs) to get the right "cover" of concrete below. The building control
bods will check it all.
You will need "soft annealled tying wire" but the re-bar supplier can
get you this, theres a bit of a knack to tying it but as long as you
get it tight its OK.
Get a pair of cutters like these
http://tinyurl.com/74ehr
You loop the wire round the bars in a figure 8, grip the ends, twist a
few times then snip, easy.
One good tip is to allow plenty of time to get the steel in place
BEFORE the readymix trucks arrive, thats a big mistake to make !

If you have to do it then good luck mate.


--
Nick H

On Sun, 27 Nov 2005 15:46:41 -0000, "Don" popple @diddle .dot wrote:

Due to possible bad ground conditions, I may have to use a raft foundation
in my 25sq M, single storey, flat roof extension. I was wondering whether I
could tackle the steel reinforcement which involves having a 400mm x 6M
long, sq box made out of A142 mesh and marrying it with sheets of A142 mesh
and various lengths of 12mm ms bars. I' ve seen guys on building sites
twisting thin wire around steel mesh etc, but how do you bend the bars and
what kind of overlaps are required? Anyone have any experience or advice to
impart?

I refer to the following site:
http://www.nuneatonandbedworth.gov.u...es/default.asp No2 Raft Foundation


Cheers
Don


I did all my own steelwork.

You but the bars bent. Forget the builders merchant, find the local
stockist of this stuff.

To tie them, you use potato sack ties, and a special twisting tool -
easy peasy.

You also need to space the bars, again the stockist will have all the
stuff you need.

Here are pictures of what I did. The main issue is the mesh comes in
8mx4m sheets, and you need two people.

http://www.pen-y-geulan.com/diy/steelwork.html

Rick