Take the 2-minute tour ×  I have some bricked exterior areas
that had some cement render on them, and then paint. The render
has fallen off the bricks in patches.  I think the problem is
that large chunks of the brick work was done using cement blocks
rather than clay bricks as the areas that have come away tend to
be more over these bricks than the clay bricks.  The cement
bricks though are not the ordinary breeze block type porous
heavy versions, but are more aerated and lighter than normal.
They also appear to soak up moisture a lot easier (what I
suspect is more the problem).  So given the problems with the
bricks, what would be the best mix for a render coating that
means I do not need to actually replace the bricks themselves?
share|improve this question I want to help you, but i need to
see this, please add some images. –  Asaf Chertkoff Apr 1 '11 at
8:23 @Asaf, will try and capture some images on the weekend. – 
TravisPUK Apr 5 '11 at 14:44  1 Answer 1  up vote 2 down vote
accepted  I'd add a mortar