The soffit is the underside face of a roof overhang. (If you stand under the overhang and look up, you’re looking at the soffit.)
Fascia is the board nailed across the ends of the rafters at the eaves, and the face of roof gables. Usually is cladded by aluminum, called aluminum fascia.
The soffit is made of different material such as wood, fibre cement, vinyl, etc.The most common material used in Ontario is aluminum.
In new construction, we often install continuous perforated soffit vents that allow fresh air to enter along the entire soffit length. In an existing house, however, the soffit is usually solid wood or composite board.
TYPICALLY USED ALUMINUM SOFFIT AND FASCIA
VENT THE ATTIC SPACE
If the roof attic it’s not proper insulated, heat will escape through the inner space ceiling and other openings. If your roof stays warm in frigid weather, snow can melt on the roof’s plane and then refreeze on the lower part of the roof, resulting in ice damage to shingles and eavestrough. In hot weather, intense moist heat can build up under the roof deck, causing wood in the attic to warp and twist.
It is essential to have the attic constantly ventilated with fresh air. Soffit are an essential component when it comes to allowing air into the roof attic.
You can improve ventilation by:
– Proper insulation on the ceiling, around outlets opening and duct system
– Soffit, rigid vents, roof vents