Question 1

How many downspouts does an under deck gutter system need?

Accepted Answer

The working rule is one 3x4 downspout, paired with an overflow box, for every 250 to 300 square feet of underdeck. The overflow box acts as a relief valve for storms that exceed the math.

Question 2

Do under deck gutters need leaf guards?

Accepted Answer

Not at all, the deck boards above act as a first screen, so what reaches the gutter is smaller debris that flushes out with a hose. Adequate slope and enough downspouts matter far more than guards.

Question 3

How often does an under deck gutter need cleaning?

Accepted Answer

At least twice a year: once in late spring after seeds and pollen drop, and once after leaves fall. Flushing the gutter with a hose takes less than 20 minutes.

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