The raincatcher rainwater harvesting systems calculator this calculator shows you what kind tank size you will require and the savings you can expect from. Category 2 and 3 flat roof drainage linked to local rainfall data. To use the gdo calculator enter information about the location, roof design and types. To access our freetouse online software, please provide your company name, name and email address in the boxes below, read the statements. Our calculator uses industry standard calculations to determine optimal gutter size. Eaves drainage gutter sizing and pipe calculator for cast and contemporary gutter types. It is a ms excel file and uses data contained in ncc volume two for the.
They have the same design as roof drains, only smaller. The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain. The slope of the roof in inches per foot decimal for fraction of an inch. This will calculate the size of chutes and hoppers draining from a flat roof to downpipes on the exterior of the building to bsen 12056 part 3. The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in ss525. Divide the roof into approximately equal catchment areas and determine downpipe positions. Cool flat roof calculator works the same way as our online. A 900squarefoot flat roof in the san francisco area, made of concrete tiles, costs. Calculators for designing eaves gutters, box gutters, downpipes, pipes and open channels etc to australian standards. Roofing calculator estimate roof prices cool flat roof. To use the gdo calculator enter information about the location, roof design and types of overflow measures. The results of the calculations are shown in a series of tables. This calculator uses the equations that are laid out in the smacna handbook. Suitable for flattish roofs with little or no vertical faces or steep roofs draining to one side of box.
How to use the more downpipes section of the roof gutter. Roof drainage calculators our online tools have been designed with simplicity in mind removing the need for any prior specialist industry knowledge. According to improve nets online roofing calculator, a flat roof is significantly cheaper than a pitched roof. The new gutters, downpipes and overflow gdo calculator is now available. Gutters, downpipes and overflow calculator australian building. For domestic rainwater gutters calculations contact david roy. We have carried out the calculations detailed in the standard for some of the main roof gutteroutlet configurations normally associated with industrial and commercial buildings. By providing us with the roof plans and elevation drawings of the building showing. Roofing calculator by is a free flat roof prices estimating tool. Roofing calculator estimate roof prices roofing calculator is designed to provide approximate replacement prices for pvc flat roofing and metal roofing. Gutters, downpipes and overflow calculator australian.
Divide the roof into five catchments and nominate the high points between downpipes see figure 3. The drainage of flat roofs is essential to drain off rain water and to protect the roof against. How to use the more downpipes section of the calculator available from skip navigation sign in. The tools guide the user step by step allowing fast and simple roof drainage design whilst ensuring full compliance with bs en120563 rainwater drainage design standard. We have carried out the calculations detailed in the standard for some of the main roofgutteroutlet configurations normally associated with industrial and.
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