Exterior pebble dashed wall

Oilyboy · Post by **Oilyboy** » Tue Feb 03, 2009 9:28 pm

I want to put a chemical damp proof course on an Exterior pebble dashed wall,
What I read seems to suggest thatI should drill into the mortar bed between the bricks. But I cannot see where this is through the render. Is it okay to just drill and hope that the solution will work, be it in brick or mortar

I would be grateful for any info.

Post by **ultimatehandyman** » Tue Feb 03, 2009 9:49 pm

Normally chemical dpc's are injected into the brick.

I have heard that they inject the mortar on stone properties only!

Is the interior wall damp or is it not a cavity wall?

If it is a cavity wall has the interior wall been dreated for damp?

RemedialExpert · Post by **RemedialExpert** » Thu Feb 05, 2009 8:05 pm

sorry admin but the current methods for solid brickwork is in the mortar joints, used to be in the bricks

.. oilyboy you can drill through the render coat but this will only bridge any course you install, the external render should either be raised to the correct level or cut a lateral slot to break the render bridge and install the chemical dpc whithin the slot then fill with a silicone..

Oilyboy · Post by **Oilyboy** » Fri Feb 06, 2009 3:25 pm

Thanks guys, it obviously been treated in some way before.
It is sand/cement render to about 1 metre high on the inside, but the damp seems to be above this height now So it seems that the damp is rising within the render.
oilyboy