Summary of drain set up
Summary of drain set up
Before you undertake DIY plumbing and drains work it is essential to understand the national rules and rules formulated by the local authority.
If you are considering altering your existing sewage, or installing a new sewage 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. In most cases they do not need to be notified for a simple replacement of broken parts.
Whatever water we see on the surface around your home is usually rain. It can drain out through a soakaway, watercourse, surface water sewer or, especially in older houses, into the dirty water sewage pipes. The rainwater pipes in combined drainage systems empty their discharge into the foul water drains through gully traps, this prevent foul air from escaping outside creating odours. But modern systems are especially created so that dirty water and surface water remain separate. It is extremely important to ensure that you do not connect foul water to a surface water sewage system. If you are unsure about the drainage system around your house get advice from the Building Control Department before you start 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. Have an eye to future care when you design the sewage system and always try to keep the waste or soil pipe as straight and short as you can when you are devising the layout. If the pipe slope is excessive, your joint alignment may fail. A surveyor’ site level should be used to work out the fall of a drainpipe. In case you don’t have a surveyors site level, choose a datum point and then a water filled hosepipe can be used to calculate the fall from there.
You will need to guarantee that you do not impact on the stability of the building whilst installing your drain ditch. If placing a sewer alongside the home, you need to make sure any foundations are not damaged.
Do not dig the ditch too long before laying the pipe when installing a new sewage system. Make certain that the pipes are laid as soon as possible and then bury them immediately after the testing and inspection are completed.
You may need to provide some support to the trench depending on the soil in that area and the depth of the trench. You should avoid any risks with this project. Be on the safe side and secure the sides of such risky trenches by propping with sheets or boards. Keep the ditch as narrow as you can but of course make sure that there is enough room to work in the trench including any plan, machinery or tools you require. The base of the ditch should be clean and even and free from protruding stones or bricks etc. If the exiting material is not suitable then you may need to import a suitable material for the base of the trench.
Pipework must be uniformly supported by the soil bed, and not by stones or bricks haphazardly placed underneath the pipes. This should not be used as support for the short or the long run because it will damage the pipe, the pipe needs to be fully supported over its full lenght. The bedding should be made compact to fit around the pipe joints. A good guideline is that support should be provided for the entire length of the pipe.
It is very important that the design of the sewage system should be constructed in such a way that all parts of the pipework are accessible to a set of drain rods for future maintenance. This need for drain rod access can be easily achieved by keeping the pipeline straight and in short sections. As a rule of thumb, a directional change in the pipework must have an inspection chamber for rodding access as drain rods do no go around corners.
If you are keen on DIY and follow some basic rules then you will be able to do plumbing and drainage on your own.
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