Rainwater goods usually referred to as guttering and fall pipes are often as fundamental to keeping a building watertight as the roof coverings.

The purpose of the rainwater goods is to provide a safe and watertight passage for water, collected by a roof slope or elevations, to ground level. Once at ground level, the water can then be discharged as appropriate by a  surface water drainage system.

Gutters and fall pipes can be made from an array of materials, importantly, such products should be correctly sized for the roof area that they are designed to accept water from. Further, such products should be in keeping the with the nature of the building to which they are attached.

Guttering and drainage, like other building works, is covered by a British Standard. For reference, this standard is BS EN 12056:3-2000 which supersedes BS6367: 1983 “Code of practice for drainage of roofs and paved areas”

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Working out the guttering required

Firstly, when considering rainwater goods it is critical that the effective roof area, from which water will discharge, be calculated.

Simply, the calculation, for a typical roof surface, can be achieved as follows:

AE (m2) = Length (m) x Width (m) x Height / 2 

Clearly, more complex roof areas will need alternative calculations.

Once the roof area has been determined, it is important to understand the flow rate before the appropriate gutter can be selected.

Again, a simple equation can be applied:

Flow rate (litres/second) = Effective Area x Rainfall Intensity. 

Further, to determine the size of guttering required the number of outlets along the run will need to be considered. Often, due to the unpredictability of the weather, it is best to consider over specifying any rainwater system.

At GNR, we always take into account that a larger gutter, especially on refurbishment projects, is necessary. More so, consideration is always given to the number of outlets, position and frequency of hopper heads and the fall of the guttering.

Where practicable, it is our intention to provide the following.

  • The largest gutter possible to suit the style and nature of the property without it looking out of character.
  • The greatest number of fall pipes along a run. Again, we are sometimes confined by the number of drainage channels at ground level.
  • The largest diameter of fall pipe, again it is important to us that it is in keeping with the nature of the building.
  • Some sort of fail-safe option, often, we like to design in hoppers with overflows or lead details from outlets that are designed to alert property owners to blockages before they become an issue.

The nature of our business means that many of the projects undertaken by us involve listed or historic buildings across Yorkshire. Therefore, the nature of the rainwater goods that we deal with is eclectic and by no means limited to the information presented on our site.

Rainwater Goods Guttering on a House
Custom Lead Guttering
Lead Rainwater Goods
Custom Rainwater Goods
Roof Repairs York | Gutter Clearing | Roof Maintenance

What can GNR help with?

At GNR we repair, refurbish and replace an array of rainwater goods including:

  • Cast iron guttering and fall pipes. Our services include repair, refurbishment inclusive of shot blasting if practicable, decoration and repairs to the internal joints. Depending upon the type of cast iron guttering it is often the case that we will remove it, have it blasted, repainted and then return to reinstall it inclusive of new bolts and seals. Cast iron guttering is available from a number of sources, off the peg guttering can be purchased from Drain centre, whilst specialist cast iron pieces, such as those made specifically to match an existing section, can be purchased from suppliers such as Longbottoms Foundry.
  • Further, and becoming increasingly more common, we are involved with cast aluminium rainwater pipes and guttering. Its cast like appearance yet maintenance free finish makes it ideal for a heritage look without the decoration schedule. Usually, the manufacturers of cast aluminium guttering and fall pipes have spent a great deal of time replicating traditional cast iron appearances.
  • Plastic guttering is a popular choice in terms of ease and cost. As a rule, we specify Marley Deepflow as our preferred profile plastic gutter. The deeper section sheds to cope more effectively with the sudden and often torrential nature of our rainfall.
  • Wooden gutters are still used more than you would consider. At GNR, we use timber section guttering to line with lead as part of our work to lead bay windows. A profiled timber gutter, when installed correctly, can be extremely effective.
  • Lead gutters, lead gutters adorn some of the more prestigious buildings across Yorkshire. Often, lead gutter linings are seen at the interface between roof slopes or on external facades with large overhangs. Our skilled teams of lead specialists are more than equipped to install lead gutter linings across an array of building types. Our section on lead gutters will explain more as to the most common types of lead gutter linings along with the types of buildings where they can be found.
  • Zinc guttering is often used by our teams of zinc roofers and hard metal specialists. our main supplier for zinc rainwater goods is VM Zinc. The system is attractive and boasts both gutter brackets and fall pipes clips that are not visible when installed. Zinc guttering can provide a contemporary and quality rainwater system. Remember, when installing zinc guttering and fall pipes, the ability to solder and some specialist equipment will be required.

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