Eaves Gutter Sizing

The total rainfall and how rapidly it falls will affect the runoff from the roof.

Eaves gutter sizing.

The size of the downspout should be constant through out its length. You can choose a downpipe size and calculate the number required and the corresponding eaves gutter size. 5 inch 5 520 square feet. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. And the provision of appropriate overflow devices. Learn more how to storm water design for building sites. The program will calculate the size and number of downpipes downspouts leaders required and the eaves gutter sizes for any roof.

You should have enough gutter downspouts to effectively handle the size of your entire gutter system. An inch of rain is not much but it if falls in half an hour it could flood a gutter. However too large a gutter downspout can look unattractive. Offset of more than 10 ft 3 0 m can affect drainage capacity.

Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. Gutter downspout sizes are 3 to 6 inches. Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards. Then use the information below to see what size gutter you need.

The larger a gutter downspout the more water it can drain quickly. Residential sizing samples are available to check the optimal fit but in most cases the 5 half round gutter requires standard gutterbrush for 5 gutters 4 25 dia while the 6 half round gutter requires oversized gutterbrush for 6 gutters 5 25 dia. The gutter outlet capacity should suit the downspout capacity. Most downspouts are rectangular but they can also be round or square.

Quantity and placement of downpipes. There is no limit to downpipe size or eaves gutter size. 6 inch 7 960 square feet. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

The code limit is 150mm for dp s and 26 800 sq mm for flat eaves gutters. Then use the chart below to see what size gutter you need. Particular reference should be made to the correct sizing of gutter. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

6 inch 7 960 square feet. 5 inch 5 520 square feet.