concrete for fence posts

**andrew29** · 15th December 2007, 11:16 AM

HI everyone,

I'm building a 30m paling fence and am wondering if its worth while using anything other than 20kg bags of instant concrete to set the posts. I figure I'll need close to 2 bags a post and each bag is $6.

Would it be any cheaper to mix it myself? porbably not worth the hassle?

Also while im on the subject the holes for the posts are 600mm deep and about a spade width square. Are these big enough for c section steel posts?

Thanks

**billbeee** · 15th December 2007, 08:26 PM

Making a few guesses here but I figure you may need say 0.4 of a cubic Meter. 16 posts x .6 deep x .2x.2. That could be bought from a mini-mix company.

That hole size does'nt give you much room to maneuver.

To mix it yourself, at a minimum get .5 CuM of premix and 2 or 3 bags of cement.

If you are digging by hand, the holes always finish up bigger than that.

Size of the foundation depends on on a few things, main thing is do you have to comply with any regs? If not and the fence is not too high they seem OK at 600 deep.
cheers
Bill

**andrew29** · 29th December 2007, 08:32 PM

thanks billbee, I ended up using instant concrete in bags.

Another quick question... I'm planning on using 50mm galvanised flat head nails to attach the palings to the rails. I reckon 50mm is necessary for the overlapping palings which need to go through 2 palings and into the rail. does that sound ok?

cheers

**manoftalent** · 29th December 2007, 10:24 PM

yep 50mm is the standard size for nailing pailings ..

oh and make sure the pailings overlap at least 15mm either side,preferably 20mm.. as in time they will shrink a bit and if not overlapped properly will show gaps .....

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