Soffit is a large plate with small perforated holes installed under the outside edge of the roof, under the gutter. It has several functions: it protects, it is aesthetic and it allows ventilating the attic. This kind of system is actually an air intake for maintaining a suitable temperature in the attic.

In terms of protection, soffit helps prevent water seepage and frost-thaw activity during the winter season. It also stops insects on their way to infesting the attic.

Aesthetically, soffit puts a great finishing touch to the roof.

Its most important function though is ventilation. Indeed, the air intake combined with the fan located at the top of the roof prevents the creation of moisture. Mold is therefore very unlikely to grow under such circumstances. Additionally, the air circulation that it creates helps prevent the formation of icicles over the edge of the roof.