Eaves Gutter Sizing

Total roof area also affects runoff.

Eaves gutter sizing.

Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. The total rainfall and how rapidly it falls will affect the runoff from the roof. 5 inch 5 520 square feet. The larger a gutter downspout the more water it can drain quickly.

The program will calculate the size and number of downpipes downspouts leaders required and the eaves gutter sizes for any roof. The size of the downspout should be constant through out its length. There is no limit to downpipe size or eaves gutter size. The code limit is 150mm for dp s and 26 800 sq mm for flat eaves gutters.

The gutter outlet capacity should suit the downspout capacity. 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. You should have enough gutter downspouts to effectively handle the size of your entire gutter system.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Quantity and placement of downpipes. However too large a gutter downspout can look unattractive. 6 inch 7 960 square feet.

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. Gather some basic weather information to calculate the proper size for gutters and downspouts for a house. Most downspouts are rectangular but they can also be round or square. Then use the information below to see what size gutter you need.

Offset of more than 10 ft 3 0 m can affect drainage capacity. An inch of rain is not much but it if falls in half an hour it could flood a gutter. 6 inch 7 960 square feet. 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.

Roof drainage systems should be designed and detailed by a suitably qualified trade or professional in accordance with the bca and the australian standards. Gutter downspout sizes are 3 to 6 inches. If a roof s various drainage areas call for different size gutters go for the biggest one k style. You can choose a downpipe size and calculate the number required and the corresponding eaves gutter size.

Then use the chart below to see what size gutter you need. And the provision of appropriate overflow devices.