Input the rafter span on the flat eave overhang and pitch of the roof.
Valley gutter size calculator.
This calculator is to be used as an estimating tool only.
For parapet or valley gutters please send details about your project to guttermaster so that more complex calculations can be performed for you.
To figure out what size gutters you need first you ll need to calculate the square footage of the gutter s drainage area.
This calculator uses current data to calculate the required size of gutter as well as number and size of downspouts based on your input.
Click the button to calculate the stock size needed for this job.
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.
Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.
Simplified app for android phones.
Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs.
15 m is a practical maximum gutter length to be served by a downspout.
For a simple gable end roof you would only need to make two calculations one for each slope.
Then use the information below to see what size gutter you need.
There is no limit to downpipe size or eaves gutter size.
To limit the effects of thermal expansion in gutters 50 ft.
Total roof area also affects runoff.
It is a ms excel file and uses data contained in ncc volume two for the calculations.
Gather some basic weather information to calculate the proper size for gutters and downspouts for a house.
An inch of rain is not much but it if falls in half an hour it could flood a gutter.
The total rainfall and how rapidly it falls will affect the runoff from the roof.
6 inch 7 960 square feet.
Downspout sizes must not exceed the bottom width of the gutter.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Overflow calculator for eaves gutters.
This calculator has been created and designed for excel 2013 for windows.
Based on the location roof design and overflow types the calculator provides the allowable gutter types downpipe sizes and whether the selected overflow measures are adequate.
We recommend using this calculator as a basic tool to begin determining the requirements for your drainage system however all information should be verified by hand prior to ordering or installing your gutter system.
For the gutter calculator click here.
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 you can choose a downpipe size and calculate the number required and the corresponding eaves gutter size.
