My main problem was that I didn’t know the correct term in English so couldn’t do a translate LOL
Thanks for all the great and quick replies. Sorted now
Trellis (pronounced trayee). On my blog www.lebijou2011.wordpress.com of our new build construction I often put the French terms too. If you are using more than one piece of trellis and other bits of armature you will also need the special short bits of wire with loops at both ends and the tool which you use to pull and twirl the ends of the wire together when you have put it round two iron rods. Hope this makes sense. It became my job to link all the ironwork together like this.
Vanessa, If you're looking for the flat style, it would be a panneau de treillis soudé. There are also straight reinforcing bars (fers à béton) and various other sorts, such as shown on this page from Castorama. I don't know of an online English-French dictionary that specialises in this area, but sites like Castorama are quite useful if you know enough French to start somewhere.
Wikipedia can also be helpful if you get stuck, by looking up a subject in English & then clicking on the Francais under 'Languages' at the side. Again, you need some French for this, but website translation (such as by Google) can help you get over the worst.
Leroy Merlin produce a free dictionary that you can pick up in store, is quite handy to have and being free the price is a good one lol, but for more comprehensive terminology I would purchase the book suggested or similar.
It's called treillis d'armature and it's usually specified in terms of the size of the mesh or maille and the diameter of the steel wire the fil. I used to find it useful to browse through the catalogues of firms like Point P as they are usually illustrated and it became a good way of picking up technical terms see
for examples. There is also an illustrated dictionary published I think by OUP called the Duden dictionary which is useful for all sorts of technicalities.
I bought a book on Amazon called - A Dictionary of French Building Terms. It's priced about £5 to £5.50 on the UK site. It's an invaluable help, but I can't help you today, as it's in France and I'm on the IoM!! Phil