In undulating areas there’s often a need for a retaining wall or two. They’re
great for creating terraces, or level sections of land that are easier to make
Kevin has selected interlocking concrete blocks for his wall, because they’re
able to easily form a curved wall, but timber, bricks or straight concrete
blocks would also do the job.
It’s important to get the first course of blocks right. They should be dug in
below ground level so they resist being pushed forward by the weight of earth
and water behind them. Bed them perfectly level into fine gravel or mortar,
although you could lean the wall slightly towards the ground it’s holding back.
Once the first course is in place, it’s time to lay the next course. Selleys
Liquid Nails Landscape is perfect for the job because it’s an all weather
adhesive that’s flexible and strong, and has been specially designed for this
work. Use liberal amounts on both surfaces, and be sure to bring them in contact
with each other before Liquid Nails starts to “skin”.
Any blocks that need cutting can be quickly dealt with by using a diamond
disc in an angle grinder.
Kev’s tip: Keep an eye on your levels, as errors tend to multiply with each
course of blocks. And use an adhesive (like Selley’s Liquid Nails Landscape)
rather than mortar – it’s half the work.