Explore a number of housing related calculators as well as hundreds of other calculators covering topics such as finance math health fitness and more.
Roof eaves gutter downpipe sizing calculator.
Resources aluminum series acm series column covers fastener series zinc series testing data aama pdf astm pdf gutter sizing sheet metal gages order literature northclad gutter size requirement calculator this calculator uses current data to calculate the required size of gutter as well as number and size of downspouts based on your input.
The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0 75.
We recommend resource library read more.
To use the gdo calculator enter information about the location roof design and types of overflow measures.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Gather some basic weather information to calculate the proper size for gutters and downspouts for a house.
Learn more how to storm water design for building sites.
Quantity and placement of downpipes.
To limit the effects of thermal expansion in gutters 50 ft.
15 m is a practical maximum gutter length to be served by a downspout.
5 inch 5 520 square feet.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
From table 3 3 in as nzs 3500 3 the minimum size downpipes compatible with spouting of 6125mm 2 cross sectional area installed at a 1 500 gradient are 90mm diameter round or 100 x 50.
Particular reference should be made to the correct sizing of gutter.
The eaves gutter selected is quad spouting with an effective cross sectional area of 6125mm 2 installed with a slope of 1 500.
An inch of rain is not much but it if falls in half an hour it could flood a gutter.
Then use the information below to see what size gutter you need.
There is no limit to downpipe size or eaves gutter size.
Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards.
The code limit is 150mm for dp s and 26 800 sq mm for flat eaves gutters the program will calculate the size and number of downpipes downspouts leaders required and the eaves gutter sizes for any roof.
Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.
And the provision of appropriate overflow devices.
The gutters downpipes and overflow gdo calculator assists in developing a better understanding of the ncc volume two part 3 5 3 gutters and downpipes acceptable construction practice acp provisions.
