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Do you know the first steps in drainage installation







Do you know the first steps in drainage installation

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

If you are considering altering your existing drainage, 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 regulations. However you do not require authority approval for replacement of failed joints or cracked plumbing and drains pipes.

Whatever water we see on the surface around your home is usually rain. This can discharged into a soakaway, watercourse, surface water sewer or, particularly in older properties, into the foul water sewage system. If gully traps are fixed at the junction of the rainwater pipe and the waste water drain, foul odour can be controlled. However, modern systems are designed to keep the foul water and the surface water apart. Rainwater and foul water drainage should not be interconnected, however convenient it may seem. When in doubt about the how the modern drainage system works, consult the Building Control Department.

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. Sewage pipes must be aligned as straight as possible, with inspection chambers at short intervals. You must avoid making your pipe runs too steep. Use the surveyor’s site level to calculate the drain fall over the complete system. A hosepipe filled with water from an established datum point can be used if you don’t have a surveyor’s site level.

The stability of the existing house is of prime importance it should be not compromised while the drainage ditch is being installed so check you are not impacting on the existing structure. If placing a drain pipe alongside the home, you need to make sure any foundations are not weakened.

The pipes should be laid before too long a ditch is dug as a new trench can be unstable. The pipes should be laid quickly and the ditch back filled after the system has been examined thoroughly and tested as required.

Depending on the depth and soil conditions, the ditch may require support. Do not take any risks. If you are not sure prop up the ditch anyway to prevent it from falling. Keep the trench as narrow as possible, but allow room to work in the trench. Be sure to remove any stones or bricks from the trench bed and make it as even as possible. If the exiting material is not suitable then you may need to import a suitable material for the base of the trench.

For pipe support do not use bricks or other hard materials in the trench. Such hard objects will cause the poorly supported pipe to bend or break and the joints will eventually fail. The bedding should be made compact to fit around the pipe joints. A comprehensive support should be used for the whole of the pipe.

When designing your sewage system, it is important to make all parts of the pipework reachable via a set of drain rods should a blockage occur. Thus, a drain route must be as straight as possible between any two points. Inspection chambers have to be provided at any sudden changes of direction or level, so that drain rods can be inserted easily.

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

Posted in Sewage


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