Current at: 13 May 2008
Keeping drains safe from root invasions
I am often asked about tree roots and drains. Why are roots such a problem with drain blockages and what can be done to stop them?
The answer to the first part of the question is simple – water. All plants need it and sewer and stormwater drains are a source. Broken seals on old clay pipes will allow water to escape, but even if the seals are intact, condensation can form on the outside of the pipes and this will attract roots, especially in droughts when the rest of the soil is bone dry.
Trees have very strong roots and over time will be able to penetrate holes or joints in pipes which gives them an even greater source of water. As more roots pile into the pipes, they form a mesh that catches debris and before long you have a Class A blockage.
How to fix this or avoid it is a much more complicated question. A plumber can clear the blockage, but the damage remains, water will leak into the surrounding area and this will attract more roots. Before long the problem has returned.
Rather than face a series of ‘bandaid’ solutions it is better to bite the bullet and ask your plumber to make an assessment of where the blockage is occurring, probably using a drain camera, then dig down and make repairs.
PVC is the material of choice for all new and replacement pipes. It is much more resistant to root penetration and often comes with a manufacture’s guarantee lasting some years. However, the cheapest way is to avoid all these hassles in the first place.
If you are establishing or making major changes to your garden, get a layout plan of your drain lines and make sure that there are no major plants near them. Some species are worse than others when it comes to attacking pipes; among the most aggressive are poplars and willows.
Remember, the cute little shrub can, over time, become a very big shrub or tree with an insatiable thirst for water. Think before you plant, consult your garden centre and if necessary an HIA landscape designer to make sure your garden is not going to be a future source of drainage problems and expense.
Further information: Call 1902 973 555