Multiply length peak to eave by width to determine.
How to measure rain gutter size.
Rainfall intensity is measured in a 5 minute.
Use your tape measure to determine the length of the twine marking down this calculation.
The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0 75.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted.
How to measure downspouts.
Measure the diameter of the gutter.
How to calculate gutter and downspout capacity.
Measure your gutter across the top from the back where the gutter meets the home to the outer edge.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Find the rainfall intensity for your locale.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
Then use the chart below to see what size gutter you need.
Typically gutters range in size from 10 to 15 cm 4 inches to 6 inches.
If a new home is purchased but the sizing isn t known take a ladder and climb up with a measuring tape.
Carefully climb up the ladder and measure the width of the opening at the top of the gutters.
Gutters typically come in 5 or 6 in 13 or 15 cm sizes and can be k style or half round place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach the gutters.
6 inch 7 960 square feet.
How do you calculate gutter size.
The steeper a roof s pitch the more windblown rain it can collect.
Find the width of the gutters.
5 inch standard k style gutter shop 5 gutterbrush.
Measure length of twine mark the measurement with a piece of tape and then pull the twine off of the other end of the gutter.
A steep pitched.
5 inch 5 520 square feet.
Downspout sizes must not exceed the bottom width of the gutter.
Adjusting for pitch and rainfall.
Roof slope rainwater must not overrun the front edge of the gutter.
Rain gutters can vary in size.
