After digging hole for post, do we line the hole with sand then put the post in then cement/concrete? And how deep do they go?

Hi there
Timber posts are normally just square timber. Most fence posts are treated at the factory to prevent rot and insect attack and will not require any preservatives for the first year or two. However, if a post is cut or drilled or to increase protection where the post is to go below ground level, treat the areas with appropriate timber preservative.
BURY THE POST - When sinking the posts into the ground, allow the following foundations in normal soil:

-Posts up to 1.40 m (approx. 4 ft 6in) the holes should be 450 mm (1 ft 6 in) square and 600 mm (2 ft) deep.
-Posts above 1.40 m (approx. 4 ft 6in) the holes should be 450 mm (1 ft 6 in) square and 750 mm (2 ft 6 in) deep.

Position the post in the hole and hold it upright, use a spirit level to check that it is vertical. Ram the earth around the post or preferably embedded using large rubble or old bricks at the bottom of the hole with firmly compacted earth above. For even better results insert some rubble around the foot of the post and top off with a dryish concrete mix (1:2:4 cement: sand: coxxxx aggregate) - brace the post while the concrete hardens. Slope the top of the concrete away from the post so that rainwater will run off.

Hi duanne,Thank you for your reply,it is very helpful. did I mention that the posts are made of concrete,would that be the same mix of concrete,cement and sand?

Hi there
Yes the mixture would be the same.
Ensure that groung around the hole is secure enough t sop movement though.
Best of Luck