In article m,
dennis@home wrote:
On 13/04/2013 21:05, Phil L wrote:
unknown wrote:
Previously I've just used a spade to dig-out holes for concrete spurs
but I'm tempted by either an auger or a "post hole digger" ... which
works best? These are available from several places; the SF ones get
good reviews but look a bit expensive compared to the others ... is
the extra cost justified?

Supplementary: how much postcrete am I likely to need when setting a
75x75 spur into a 600x150'ish round hole? (I know I could do some sums
but in this case I think benefitting from experience is going to give
a better estimate)

buy cement and ballast and mix your own, or if there's a lot, buy a
tonne bag each of sharp sand and 10mm gravel....trying to make the hole
smaller is cutting down on concrete, thereby defeating the object of
making a hole at all.



You don't usually need concrete at all for fence posts. If the hole
doesn't collapse when you dig it a bit of gravel compacted around it
works fine. You don't see many telephone poles concreted in.

True, but they tend to go in far deeper and the hole is machine made. When
the hole has to be dug with a spade there is a large void round the post.
Gravel tends to migrate into the surrounding soil.

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