How to fix into the top of a hollow block wall

[Mike13]

Hi,
The blocks are 215x440 reasnoably flat, and I have some spare 100mm square posts that I need to fiz horizontally to the top, but I have the hollows vertical, so run the risk of the holes bursting if I drive a screw down into them.
Has anyone tried something like this and got a simple answer to joining these.

 

[Wayners]

Not sure what you want to do however.
Could you used bolt resin somehow?

 

[JohnD]

Are these posts an ornament, or do you have a purpose in mind?

How will you prevent rain running into the wall or rotting the wood?

 

[Deluks]

Took me a while to figure out what he meant.

You could screw a strap into the face of the wall, which screws into or over the top of the timber.

You could infill the top of the blocks with concrete or even expanding foam, and fix down into that.

 

[Mike13]

The hollow blocks are in the garden below ground, and I need to add something so that a bed can be flat.

We have very sandy soil, so often very dry, it does not usually rot fast in that part of the garden.

 

[^woody^]

Concrete some threaded rod into the wall every 600mm or so, fit the timber over these and fix with nuts.

 

[JohnD]

The hollow blocks are in the garden below ground, and I need to add something so that a bed can be flat.

We have very sandy soil, so often very dry, it does not usually rot fast in that part of the garden.

Do you mean edging for a flower bed?

You could mortar a course of (frost resistant) paving bricks to finish the wall.

 

[Deluks]

So you're going for a sleeper edged bed type effect?

 

[Ivor Windybottom]

I'd say we need to understand what you're trying to achieve, it sounds like you've already decided on one method that relies on doing the impossible!

Putting steel or wood in a retaining wall is generally a bad idea. Because it will be almost permanently wet, either will rot away pretty quickly.

 

[Mike13]

yes, it is next to the edge of the garden, and is a usually dry spot, the blocks set in the ground are out of the way and have been there over 20 years. It is usually dry in that part of the garden, so not expecting it to rot quickly.