Installing gutters on a tile roof can be a tricky task, as there are several special considerations to take into account. If your home has a steeper roof slope, you'll need to increase the size of your gutters to accommodate the faster rate of rain runoff. Additionally, you may need to use gutter extensions or create custom downspout solutions for gutters larger than 6 inches wide. It's also important to install a high-quality gutter cover and place downspouts so that water moves away from the foundation of your home.
When it comes to calculating the size of the gutter you need, you can calculate the square footage of the gutter's drain area. If you're in a high-capacity situation due to roof inclination or rainfall levels, adding additional downspouts can increase the drainage capacity of the gutter. The general rule of thumb for placing downspouts is that one is needed for every 25 to 35 linear feet of gutter. In areas with high maximum intensity of rain, larger gutters are necessary to prevent your system from being overwhelmed by heavy, sudden rains.
7- and 8-inch gutters are rarely used in residential buildings, although they may be suitable for unusually large houses with steep roofs. While semicircular gutters offer aesthetic benefits, they generally don't move water as efficiently as K-type gutters.
