Do this before you start drainage fitting

Before starting any plumbing and sewage work yourself you should find out about any Local Authority rules that relate to your area.

If you are considering altering your existing sewage, or installing a new drainage system you will almost certainly need to present some detailed plans of the work that you intend to undertake and it will need to be inspected as the work progresses making sure that it complies with the local building rules. However you do not require authority approval for replacement of failed joints or cracked plumbing and drains pipes.

When rain falls on your house and property, it runs across as surface water and has to be drained properly. An earlier method was to directly discharge this surface water into the sewage drains, but modern homes use a surface water sewer or watercourse or soakaway to drain or absorb rainwater. In a system combining both functions, the rainwater pipes clear out into the dirty water drains through the gully traps that prevent fetid air from sneaking out of the drains. However with the new drainage systems, the foul and the surface water can be kept apart. If you have a modern system it is very essential that you make sure that you do not accidentally integrate the foul water to a surface water drainage system. If you have doubts about your house’s drainage system, you can get help from the Building Control Department before you begin any work.

To properly prepare the plans and get local authority permission to commence work there is a need for you to plan the route of the waste pipes before you begin. Keeping the path as straight and short as possible will be the main concept behind the design of the waste passageways or pipes. You should not make your pipe runs very steep although some gradient is essential. With the help of a surveyor’s site level, you will be able to determine the fall of a drain over a distance. Or just fill a transparent hosepipe with water and use the water level at the two ends to mark the required fall from the starting point.

When installing your drain ditch, you will need to make sure that you do not impair the stability of the building. The substructure of the building should not be undermined by your digging if the waste pipe runs parallel to it.

While installing a new sewage system make sure that you do not dig too long before laying the pipe. Get the pipes laid quickly and, as soon as they have been tested, fill the ditch back in.

Depending on the depth and soil conditions, the ditch may require support. It is advisable to take proper precautions. If you are not entirely confident of the stability of the trench you should add support. You must make the trench as narrow as possible while leaving enough room to work inside it. The trench base must be smooth and clean, there shouldn’t be any bricks or protruding stones around. The base should be good so you may need to import material if the existing soil structuire is not up to the mark.

Never use bricks and/or other hard materials to support the pipe in the trench. Even if used for just a temporary support this can damage the pipe. The base should be tightly packed in the appropriate manner with holes carved out to fit in the protruding pipe connections. A good guideline is that support should be provided for the entire length of the pipe.

It is important that all parts of your drainage system are designed so that all parts of the pipework are accessible to a set of drain rods. This need for drain rod access can be easily achieved by keeping the pipeline straight and in short sections. An inspection chamber should be present at places where the pipework changes its direction, this is important so that it remains accessible to drain rods and they do not need to go around corners.

If you follow this guidance, sewage and DIY plumbing can be within the range of the most DIY enthusiasts.

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