Find the width of the gutters.
How to measure rain gutter size.
Downspout sizes must not exceed the bottom width of the gutter.
Use your tape measure to determine the length of the twine marking down this calculation.
Then use the chart below to see what size gutter you need.
Measure the roof to get the watershed area the area from which water will run off.
Measure the diameter of the gutter.
Multiply length peak to eave by width to determine.
The steeper a roof s pitch the more windblown rain it can collect.
6 inch 7 960 square feet.
Furthermore the standard norm for gutters among many in the rain carrying industry is to allow 1 square inch of outlet opening in the gutter for every 100 square feet of roof area being drained.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
How to measure downspouts.
Roof slope rainwater must not overrun the front edge of the gutter.
Rain gutters can vary in size.
Carefully climb up the ladder and measure the width of the opening at the top of the gutters.
Typically gutters range in size from 10 to 15 cm 4 inches to 6 inches.
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.
If a new home is purchased but the sizing isn t known take a ladder and climb up with a measuring tape.
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.
How do you calculate gutter size.
5 inch standard k style gutter shop 5 gutterbrush.
5 inch 5 520 square feet.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
How to calculate gutter and downspout capacity.
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.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Rainfall intensity is measured in a 5 minute.
Find the rainfall intensity for your locale.
