Concrete block make up.

[conny]

I have dug 2 holes for my garden gate posts. The holes are 760mm x 760mm x760mm (approx.), and I am using 150mm x 150mm posts x2000mm

How much cement, sand and gravel will I need to fill the holes to secure the posts?

 

[Doggit]

Your holes shouldn't have been much larger than 300-500mm sq. You're going to need about 1cu mtr of concrete to fill those 2 holes, and a here's link to help you work it out

 

[tomfe]

I am sorry I have to laugh. Going to be the most over engineered posts in the world world world world.......

 

[garyo]

I have dug 2 holes for my garden gate posts. The holes are 760mm x 760mm x760mm (approx.), and I am using 150mm x 150mm posts x2000mm

I've just bought some shares in LaFarge - hopefully I got in there before your concrete order rocked the markets!

 

[garyo]

I have dug 2 holes for my garden gate posts. The holes are 760mm x 760mm x760mm (approx.), and I am using 150mm x 150mm posts x2000mm

Are they enormous gates and you're planning on installing the posts off-centre and use the concrete as a form of upside-down cantilever or something?

 

[tomfe]

Unless they are steel posts they wont be strong enough for massive gates

 

[JohnD]

A good tip for gateposts, to prevent them leaning together, is to trench between the two pits so you can pour a ground beam to hold them upright.

 

[conny]

The world is a stage and everyones a comedian. Oh well, at least they should stand up to the next storm, then maybe I will be the one with a smile on my face.

By the way, the gate is a hardwood, 12' wide, 5 bar agricultural one so will need good support.

 

[tomfe]

You might want to chuck some old bricks/blocks in with the concrete to help fill it out a bit.

 

[Doggit]

Ouch, big gates. I'd have gone a bit deeper, but not so wide, in fact, I think going down to a metre wouldn't be a bad idea. You might as well go for broke at this stage, as you've got a very heavy cantilever on those gates. And tomfes made a good point, a few concrete blocks thrown in after an initial 100mm layer wouldn't go amiss. This is definitely not a standard upright post scenario that everyone was expecting.

 

[conny]

Which is why I will also be fitting a jockey wheel for support on the latch side. Good idea about the bricks/blocks.