Valley Gutter Size Calculator

For parapet or valley gutters please send details about your project to guttermaster so that more complex calculations can be performed for you.

Valley gutter size calculator.

Input the rafter span on the flat eave overhang and pitch of the roof. This calculator is to be used as an estimating tool only. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Overflow calculator for eaves gutters.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Simplified app for android phones. For a simple gable end roof you would only need to make two calculations one for each slope. Total roof area also affects runoff.

It is a ms excel file and uses data contained in ncc volume two for the calculations. 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 total rainfall and how rapidly it falls will affect the runoff from the roof. 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.

An inch of rain is not much but it if falls in half an hour it could flood a gutter. To limit the effects of thermal expansion in gutters 50 ft. Click the button to calculate the stock size needed for this job. 5 inch 5 520 square feet.

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. Downspout sizes must not exceed the bottom width of the gutter. Downpipe and eaves gutter calculator valley gutters generic rain water outlets for flat roofs. Water pipe size calculator information video water pipe size calculators size every pipe in your project in seconds with just 3 clicks.

To figure out what size gutters you need first you ll need to calculate the square footage of the gutter s drainage area. 6 inch 7 960 square feet. 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. Gather some basic weather information to calculate the proper size for gutters and downspouts for a house.

15 m is a practical maximum gutter length to be served by a downspout. For the gutter calculator click here. If a roof s various drainage areas call for different size gutters go for the biggest one k style. This calculator uses current data to calculate the required size of gutter as well as number and size of downspouts based on your input.