Rainwater drainage is covered by building regulations part h3.
Roof rainwater drainage design.
Rainwater calculations are carried out in accordance with bs en 12056 3 2000 and.
It is important for architects plumbing engineers and civil engineers to work together to design a system that will properly drain rainwater from a building and site.
The result is the number of drains needed.
You also must include half of the area of any vertical walls that may divert rain to the roof.
Last updated 27 feb 2019.
You can view information on the design of roof drainage systems in the brochure for your state.
Take the roof s total square footage and divide by the total square footage handled by one drain.
Last updated 23 jan 2019.
The effective roof area to be drained.
Improper gutter drainage can cause erosion of soils and foundation issues.
As we will see in steps 3 4 the size of the roof drain lines is dependent on the square feet of the roof area being served by each roof drain.
The number and position of downpipes.
Box gutter with rain water head at end of box gutter.
This table is based on zurn s roof drain vertical requirement for horizontal roof areas at various rainfall rates table.
For further rainwater design advice view our rainwater design and installation guide.
The above sizing data is offered as a guide only.
Sizing a roof water drain.
To assess the suitability of a gutter system to drain the roof of a building the following factors need to be taken into consideration.
Buildup of rainwater on a roof can cause structural damage and leaks.
See more ideas about rain water collection rain water collection system roof.
Approved document h makes basic provisions for adequate disposal of rainwater from roofs and paved areas minimising the risk of blockages or leakage and ensuring access is provided for maintenance.
Lysaght rainwater solutions vic tas guide pdf 1 6 mb.
Jun 28 2020 explore casdesigns s board roof drainage on pinterest.
Calculate drains needed.
Simplified suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box gutter only or any roof if you are in a hurry and make the necessary allowances for all catchments.
Lysaght rainwater solutions nsw guide pdf 2 8 mb.
Last updated 26 aug 2016.
The flow characteristics of the gutter system.
The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.
Lysaght rainwater solutions qld guide pdf 2 2 mb.
Screw a drain cover over the end of the tubing as it approaches daylight to keep critters out.
To prevent erosion make a rock bed around the end of the tube.
