Gravel Board Fix to Recessed Posts???

[tododo]

Hi all - about to buy some recessed concrete posts for a closeboard fence

Our new next door neighbours land is about 2-3ft higher on their side and their wall is in a bit of a state - so as we have been looking at this sorry wall for years we think a fence would be a good idea and it would also give them a bit of privacy too

We are also planning a new drive so it would make sense to get some concrete posts in the ground before the drive is layed too

So Ive been looking at the 8ft 3inch (2.515m) recessed posts from Selco... bearing in mind things are very difficult to source at the moment too

Ive dug 600mm post holes ready giving a total post height of 1.915m or there abouts and we were looking at an overall height of 2.1m in fencing hopefully - I would dig down further but we need the height of the fence too as they are much higher on their side and I assume the arris rail would need to be fairly high to avoid flappy fencing at the top

The query I have is with gravel boards on recessed posts in particular - how are they attached - just a bolt through the post and into the gravel board - do you need to drill out a hole in the gravel boards??

All I can find online is the H type posts where they are used for panels and the gravel boards neatly slotted into them??

Heres some photos of the general condition of the wall - its falling down slowy and we are particularly concerned about this section of wall near their garage - dont know how we can sort this yet

 

[Tigercubrider]

That's the hell of a drop to fill with gravel boards?

Are the arris rails 6 feet? Can you get 7 foot ones?
One possibility might be to fit a 4 foot H post level with your ground or 6" higher, then the arris rail type, then another 4'H post, a 6 foot gap, and repeat.

Stick all three in the same hole and add postcrete etc- work out the ends

12" gravel boards are bloody heavy so after each post hole is done, fit the gravel boards and shore them up before fitting the next triple set.

Does that make sense?

Only other idea is to get some shuttering ply and cast a retaining wall in situ

 

[JohnD]

as the higher ground is liable to collapse over time, it will exert a huge force on what will really be a retaining wall. Gravel boards can hold something light like a compost heap, but not tons of loose earth.

A retaining wall can fail, not just by breaking, but by being pushed over, or the ground it is built on cartwheeling, so it needs to be reinforced, and either deep or with a strong "toe" weighted down by the ground above.

You could make a wider retaining bank using concrete or timber cribs, but there is some way of calculating the requirement.