Carefully climb up the ladder and measure the width of the opening at the top of the gutters.
How to size gutters.
Measure the length and.
Make sure the ladder extends at least three feet.
Each square inch of downspout cross section can drain 100 sq.
How do you do the math to figure out how large your gutters should be.
Measure your gutter across the top from the back where the gutter meets the home to the outer edge.
Get 7 or 8 inch gutters.
Ft and a 3 in.
This determines the maximum watershed level gutters can serve between downspouts.
5 inch standard k style gutter shop 5 gutterbrush.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
Doubling the number of downspouts halves the required capacity for each.
How do you calculate gutter size.
Find the width of the gutters.
Spout drains 1 200 sq.
Calculate your roof.
You ll also need to.
You have three options.
Gutters come in different sizes.
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.
Size downspouts to fit the gutter.
Downspouts also come in.
What size gutters do you need.
Set up an extension ladder against one edge of your home s roof.
Per ft and you can multiply the watershed by 1 4.
Pitch your gutters by 1 8 in.
They ll cost more and probably require a custom order through a professional installer.
Spout drains up to 600 sq.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
How to size gutters downspouts 1.
Increasing the pitch increases a gutter s.
Increase the pitch of the gutter.
They can be 4 5 or 6 inches.
The standard is about inch per 10 feet.
Consider your drainage area.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted.
Divide these areas by the local rain fall rate in inches per hour to determine the actual roof area to be served by the gutter diameter.
Gutters come in different sizes.
The steeper a roof s pitch the more windblown rain it can collect.
Place the torpedo level on the roof with the level body sitting perpendicular to the roof peak.
