rasik wrote:
Hello
I am planning to build a brick herb box after my garden patio. The
box will be 900mm high (from patio floor), 5 meters long with 300mm
planting width between the brick walls. This will also act as a wall
for the garden patio. The brick wall will be half brick (102mm) on
each side.

I would like to know what I need to consider during the build. Is the
brick wall structure (thickness) ok, water proofing, drainage, mortar
mix etc? Your advice would be much appreciated. Any good websites?

Thanks
Rasik

What is the base of the box that the bricks will stand on? When building
brick walls they need to be given a sound and stable foundation otherwise it
doesn't matter how good your bricklaying is it will fall over.

Make sure you leave plenty of weep holes (say every 300mm) at the bottom for
drainage. If it doesn't drain freely your plants will die and in the
extreme case the hydrostatic pressure will push your wall over, although at
900mm high this isn't likely.

Your mortar should be Portland cement and clean fine sand with a dash of
fine clay. There is a tendency for amateurs to make the mix very strong but
that isn't required. The clay will make the mortar "fatter", that is more
adhesive and easier to flow. Look up the best ratio, I forget.

Do you have a level and string line and do you know what to do with them?

David