Gutter System Design

Designing an effective roof drainage system can be very difficult and most people hire an outside contractor to carry out this work for them. There is certainly nothing wrong with this approach but there are definitely more cost effective methods of designing a drainage system. Your gutters are all that stands between your home and complete destruction, so look after them at all costs. The passage below will delve into this subject and will help your better understand gutter design. In the earlier years of the 21st century, a new law was passed that enforced building regulations governing how you implement a drainage or guttering system. This new agenda went into great detail in regards to rainfall volumes and the corresponding gutter throughput volumes.

Gutter Design

At JT Gutter cleaning we provide a service that takes care of all this for you. We follow an in-house model which calculates exactly what the job needs, in terms of piping and ground level drainage. Interpreting the rainfall rate is a delicate operation, with the standard for what is acceptable for drainage having changed drastically in the last few years. A rainfall rate that fell within the parameter of 70 mm/h was deemed as appropriate for flat roofs but this has been amended to cover high-intensity storms. An average rainfall rate is not a good indicator when deciding on the semantics of any install, as it does not reflect how rainfall occurs naturally in nature. Here in the UK, heavy rainfall can come on suddenly, dropping thousands of gallons of water over a very short period of time and your guttering system needs to be able to handle this.


The first element to consider when designing any new system is the type of gutter to be used in the project. Models that discharge over-spilled water outside of the building are characterised as eaves gutters and are generally the most common type in Liverpool. Valley gutters have a different approach to overflowing water, discharging the water in to the internal part of the building. With eaves gutters the throughput rate required for the piping depends primarily on the size of the area to be drained by the system. The throughput capacity of the ground drainage system below also impacts the throughput rate needed for the rain gutters but surface area is most definitely the number one concern. For valley guttering it is good practise to have them large enough and strong enough, so someone can easily maintain them by being able to walk directly on them.


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