Gutter Installation
BS EN 12056-3:2000 states that gutters should be normally level (with a gradient of between 1mm/m and 3mm/m where practicable).
This standard also states that "where snow is likely to lie on roofs, the front edge of the gutter should not be higher than the projected line of the roof, unless snow guards or other precautions are used."
Gutter Capacity
The profile and dimensions of a gutter determines the maximum flow rate (capacity), currently given in litres/second. The height of gutter profile determines the maximum length of gutter run before resultant overflow at the 'high point' (i.e. stop-end or mid-way between outlets) calculated per BS EN 12056-3:2000 as 50 x height.
It is most important to consider the position and number of outlets as well as the size of gutter.
Rainfall Intensity
Rainfall and storm intensities vary between differing locations within the UK and a number of pages are devoted in BS EN 12056-3:2000 to variations and safety factors, relating to various types of buildings and gutter locations. Eaves gutters should be designed using a one year storm event, and the intensity found from maps in BS EN 12056-3:2000.
Catchment Area
In accordance with BS EN 12056-3:2000 the drainable catchment area of a pitched roof is calculated by adding half the height to the plan width and multiplying by the length as follows:
Design Flow Rate
End Outlet in Gutter
Centre Outlet in Gutter
Characteristics of Marshall-Tufflex
Rainwater Systems
| Properties | |
|---|---|
| Specific gravity | 1.35-1.45 |
Co-efficient of
| Linear expansion | 7x10-5/m/°C |
| Water absorption | Negligible |
| Oxygen index | 42% |
Vicat Softening Temperature
| Extrusion | Moulding | |
|---|---|---|
| Black Average | 80.5°C | 76°C |
Chemical Resistance
The material is virtually unaffected by solutions of inorganic acids, alkalis and salts and is resistant to many organic chemicals. It may be softened by some organic materials such as ketones and aromatic compounds.
It will not corrode.
Fire Resistance
The materials used in Marshall-Tufflex Rainwater Systems are self extinguishing.
Standards
Rainwater systems are manufactured to comply with the requirements of BS EN 607:1996; BS EN 1462-1997; EN 12200-1:2000; BS 4576-1:1989 where applicable.
Installation Guide
Installation instructions for all our systems are available on request. When fitting our products, the Building Regulations should be followed