Steel for floors

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rmdt

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Hi, just wondering what type of steel mesh I should go for in concrete ground floors. Looking at using 25 N concrete over 100mm of PIR insulation. Would A142 be good enough?
 
That's what we are putting in our foundations actually. Thought I could use a lighter mesh in the floors as the engineer says its not essential to include.
 
A393 does seem vert heavy and expensive for the floors, would think A142 should be sufficient but maybe A252 could be used. Take advice from someone in the trade that knows for sure.
 
Thanks Johny D, there is a big difference in price so keen not to go over the top, but certainly want to do it right all the same! Just for everyones info I have been quoted the following for steel...A393 €95 per sheet, A252 €61 per sheet and A 142 €34 per sheet. All prices including the dreaded vat!!!!
 
And do yoy know that last April A393 mesh could be bought for aprox Euro 55 including Vat. Thats some price increase over a few months.
 
A142 should be adquate in the ground floor as it's only really to prevent cracking (but confirm with your supervising engineer). If required would it make sense to put 2 layers of A142 instead of 1 layer of A393 ???? Works out cheaper and you get more rebar. A393 is 10mm bars while A142 is 6mm bars .........
 
Mallini said:
A142 should be adquate in the ground floor as it's only really to prevent cracking (but confirm with your supervising engineer). If required would it make sense to put 2 layers of A142 instead of 1 layer of A393 ???? Works out cheaper and you get more rebar. A393 is 10mm bars while A142 is 6mm bars .........
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twice the labour

Joejoe
 
Engineer would be happy even if we don't include any steel in the floors, and builder says they generally don't use it in floors. Am I going over the top? The one thing is you can't put it in afterwards!!!!
 
Steel mesh is handy for keeping the insulation boards down when pouring concrete.........but at the end of the day it's not really necessary for a domestic build. You could place it under your internal walls if they are to be block.
 
rmdt said:
Engineer would be happy even if we don't include any steel in the floors, and builder says they generally don't use it in floors. Am I going over the top? The one thing is you can't put it in afterwards!!!!
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I would still use a single sheet of A252, should hair line cracking occur it would help reduce its effect. Laps of 300mm to all sides, raised 50mm of the surface below on engineering brick.

Joejoe
 
My latest quote for A393 for the foundations is down to €90 including VAT. Still works out more expensive that half inch reinforcing bars, but in this weather I think its worth it just to get the foundations poured as quickly as possible after digging!
 
Mesh is very handy when concrete is drying out. Holds it together much better, less chance of cracking. Am building a house myself and putting A393 down. I'm a Quantity Surveyor so i'm as tight as they come but its money well spent.
 
construct €€ said:
Mesh is very handy when concrete is drying out. Holds it together much better, less chance of cracking. Am building a house myself and putting A393 down. I'm a Quantity Surveyor so i'm as tight as they come but its money well spent.
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So am I, thats why I suggested A252 ;)

Joejoe
 
Just to let you know, after talking further with our engineer, we are going to go with A 142 in the floors. He was happy to use no steel with 50mm insulation but as we are using 100mm we are going to put in the steel. Costing us about €30 per sheet.
 
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