Dave Osborne, Technical Manager at Swish Building Products, highlights the importance of correct guttering system installation in new and replacement projects.
By understanding how to choose a guttering system with the appropriate flow-rate, and fitting both the guttering and downpipe so the system works cohesively, you’ll be rewarded with a smart installation that will serve to prevent building damage and last for many years to come.
For both new and refurbishment projects, preparation is key to achieving a successful installation. For new projects, you should select a gutter system that meets the design flow-rate or area of the relevant roof. As well as normal levels of rainfall, a domestic or light commercial eaves gutter system must be able to cope with intense rainfall lasting at least two minutes. To help you chose the best solution for your project, the British Standard BS12056 shows how to work out the amount of rainwater (in litres per second) that could run off a roof.
With regards to replacement projects, it is a natural decision to replace guttering ‘like for like’. However, you should consider the greater frequency of storms and increased rainfall we now experience and modify the gutter system’s capacity as a positive precautionary measure.
Planning makes for the perfect project
Start by planning your installation using specific component diagrams that can assist you in selecting the correct materials from the very beginning. Arming yourself with the knowledge of how to correctly install guttering is also key to a successful installation.
Gutter installation guidelines
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Downpipe Installation Guidelines · Using a plumb line, mark a vertical line on the wall from the running outlet to the drain. · Place an offset bend onto the base of the running outlet. Place a second offset bend on a length of downpipe and measure the section length required to join the two offset bends, cut a suitable length of downpipe – the “swan neck”. · Hold a downpipe clip centrally over the plumb line and mark the fixing holes on the wall with a pencil. Repeat down the wall, spacing pipe clips no more than 1.8m apart. · Drill the fixing holes. · Working from the top downwards, install the downpipe. If additional lengths of downpipe are required, join using a socket and pipe clip. · Leave a 10mm gap between the end of the pipe and the bottom of the pipe socket to allow for expansion. Fix a pipe clip over the joint. · Use wall plugs suitable for the substrate and when fitting pipe clip screws to ensure that the application is secure. Fix pipe/socket clips with 2 x 32mm x 6.5mm round head stainless steel screws. · Where required, fit a shoe at the bottom of the downpipe so that it directs water into the drain, if required. Fix the joint with a pipe clip. |
For further information on the Kayflow range visit www.kayflow.co.uk