Which guttering installation method is considered improper?

Nailing gutters directly to the roof is considered an improper installation method because it fails to provide sufficient support and can lead to various problems over time. Proper gutter installation should ensure that the system can handle water flow effectively without risking damage to the roof structure. When gutters are nailed to the roof, they do not have a stable base and can be easily dislodged by wind, debris, or the weight of water and ice. This method can lead to premature sagging or detaching of the gutters, resulting in improper drainage and potential water damage to the roof, walls, or foundation of the home.

In contrast, other methods, such as spiking through the fascia or using screws, offer better stability and support. Attaching to rafter tails can be acceptable if done correctly, as it provides a solid anchoring point, ensuring that the gutters can manage the water flow without wiggling or falling off. Proper attachment methods are essential for the longevity and functionality of a guttering system.