Gather some basic weather information to calculate the proper size for gutters and downspouts for a house.
Gutter and downpipe sizes.
Note that a minimum gradient of 1 500 is preferred.
Frequency and positioning of outlets downpipes calculate the number of outlets per run.
Then use the information below to see what size gutter you need.
Work out the roof plan areas when working out gutter sizes clause e1 requires gutters to be divided into sections.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Areas of the roof to find the appropriate down pipe and gutter sizes.
A section is the length of gutter between a downpipe and the.
Individual roof plan areas contribute to the total roof plan area.
Downpipes are available in four sizes.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Three is not enough and 4 is too many however another solution is to use different size downpipes.
75mm 87mm 100mm and 120mm.
Half round gutters r size mm d mm d mm 100 107 17 125 3 7 150 155 17 190 192 22 size mm di mm 75 75 87 87 100 100 120 120 rectangular gutters.
The total rainfall and how rapidly it falls will affect the runoff from the roof.
100mm 125mm 150mm 190mm and rectangular 136mm.
Select 100 x 50 rectangular downpipe.
Pvc rain gutter is more cost effective when compared to metal and is easier to install than metal.
5 inch 5 520 square feet.
One size to suit the chosen gutter size and one size to suit any left over.
Secondly choose the profile you want as each will offer a slightly different aesthetic depending on the look you want and the style of the property.
Total roof area also affects runoff.
An inch of rain is not much but it if falls in half an hour it could flood a gutter.
For instance the example above would require somewhere between 3 and 4 down pipes.
To utilise the full gutter capacity would require a non whole number of downpipes.
Rainline gutters are available in two shapes and five sizes.
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 rectangular.
Design of eaves gutters box gutters downpipes to the australian national plumbing code as nzs 3500 3.
When choosing what type of gutter you want consider material initially.
Calculators for designing eaves gutters box gutters downpipes pipes and open channels etc to australian standards.
