I have an internal wall in a 1980 flat conversion that appears to be
concrete sheets with breeze block colour/style material sandwiched
between. On hardness; I can't scratch or crush it with a fingernail
but can comfortably eat into it with an old screwdriver. Total wall
thickness is about 160mm or so. After chasing a channel the 1cm
concrete layer is very consistent and doesn't look to be plastered on
to the internal material, it looks more like a bonded sheet. 

Can anyone identify what type of wall this is? Was it a typical build
material for creating internal walls in the late 70's, early 80's?

I ask the question because I need to secure fixings into it to hang a
20kg glass showerscreen which provides 4 fixing points along the hinge
on which the glass hangs.

I am almost tempted to run bolts right through the wall and use sunken
nuts and washers on the opposite side - but that might be overkill,
and fiddling about with threaded rods might be a pain.

What would people here recommend?

In article , 
usenet_AT_tecno.demon.co.uk@JUNKBLOCK.COM says...

> I have an internal wall in a 1980 flat conversion that appears to be
> concrete sheets with breeze block colour/style material sandwiched
> between. On hardness; I can't scratch or crush it with a fingernail
> but can comfortably eat into it with an old screwdriver. Total wall
> thickness is about 160mm or so. After chasing a channel the 1cm
> concrete layer is very consistent and doesn't look to be plastered on
> to the internal material, it looks more like a bonded sheet. 
> 
> Can anyone identify what type of wall this is? Was it a typical build
> material for creating internal walls in the late 70's, early 80's?
> 
> I ask the question because I need to secure fixings into it to hang a
> 20kg glass showerscreen which provides 4 fixing points along the hinge
> on which the glass hangs.
> 
> I am almost tempted to run bolts right through the wall and use sunken
> nuts and washers on the opposite side - but that might be overkill,
> and fiddling about with threaded rods might be a pain.
> 
> What would people here recommend?
> 
> 
> 

I haven't a clue about the construction that you describe, but from the 
sound of it resin bonded fixings will do the job - just glue some small 
stainless studding into the wall.  Or would fixing with nuts cause a 
problem?

Peter wrote:
[snip]

>
> What would people here recommend?


Butterfly bolts