Roof Drains Calculator

Formula

The formula to calculate the Number of Roof Drains (RD) is:

\[ RD = \frac{RA}{SFD} \]

Where:

\( RD \) is the number of roof drains (drains).
\( RA \) is the total roof area (ft²).
\( SFD \) is the square feet per drain (ft²/drain).

What is a Roof Drain?

A roof drain is a component used to remove water from the roof of a building. Proper drainage is essential to prevent water accumulation and potential damage to the roof structure.

Example Calculation

Consider an example where:

Total Roof Area (RA): 10,000 ft²
Square Feet per Drain (SFD): 500 ft²/drain

Using the formula to calculate the Number of Roof Drains:

\[ RD = \frac{10,000}{500} = 20 \]

This means that the number of roof drains needed for this example is 20 drains.