Post and rail fence supported by rendered wall

[Gone fishing]

We have built an extension (all legit) about 300mm inside our property line. There s a storm/rainwater drain in the ground in the 300mm gap.

Our neighbour who we get in really well with has suggested we extend the existing post and rail fence on the property line down the side of the extension. It would break up the rendered wall and allow for some soft shrubs etc in pots to have supporting strings attached etc.

There would be 3 posts, about 120cm/4 foot out the ground and about 100mm clearance from the render, but the footings maybe compromised by the drain.

My thinking is to put a supporting standoff block between the rendered wall and post to hold the top rigid to prevent movement. The post having a concrete boot and a supported top would be quite robust.

The question, what the best way? Can I just bolt a 100mm cube to the rendered wall with long bolts into the brickwork, or would I be better trying to attach to the brickwork without pressure on the render to avoid stress/strain, either cutting a hole in the render or somehow sleeping the bolts? The render is Johnson s silicon stuff, the wall is block, all built in the last 6 months.

To be clear, I d like the fence to be there given how good the neighbours have been

Edited by Gone fishing on Sunday 16th August 08:26

[Rough101]

Just drill right through the render and into the brick, it really won’t mind the pressure unless there is a void behind it.

[Gone fishing]

Rough101 said:

Just drill right through the render and into the brick, it really won t mind the pressure unless there is a void behind it.

Thanks

I had visions of great slabs of render falling off the wall if water started to get behind it, then froze and started to lift the render. Maybe thats just the old style renders from 50 years ago