How do I determine the size of my gutters?

Written by amy rodriguez
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How do I determine the size of my gutters?
Rain can be directed off roofs to protect the integrity of the building. (intempérie image by photlook from

Rain gutters are an important part of a home's roofing system. Without properly sized gutters for a region's weather elements, the integrity of a home's foundation can be compromised with excessive water retention.

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Rain gutters provide an outlet and direction for flowing rain water coming off a rooftop. This allows the water to be manoeuvred into drainage, away from the home's immediate exterior.


Rain gutters can vary in size. If a new home is purchased, but the sizing isn't known, take a ladder and climb up with a measuring tape. Measure the diameter of the gutter. Typically, gutters range in size from 10 to 15 cm (4 inches to 6 inches).


Knowing the size of the gutters is important because it gives homeowners an idea of what kind of rain flow the assembly can withstand. If a region is prone to large rain storms or snow, a larger diameter gutter is a better choice for overall functionality over time.

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