Underside Of Roof Damp

This leads to the formation of damp spots on the surface of the roof.

Underside of roof damp.

Condensation will arise as a result of warm moist air penetrating up through the ceiling. Picture a cloud of moisture floating overhead between the rafters. If attic air is humid and roof sheathing is cold condensation or frost can accumulate on the underside of the sheathing. The source of the attic moisture is usually indoor air that enters the attic through ceiling cracks.

Another leading cause of condensation in roofs is the use of wood burner cookers. Ponce technical specialist with professional roof consultants. The same phenomenon happens with roof systems. In the event of the attic not being properly ventilated this would condense on the underside of the roof.

The cause depends on whether you have an unconditioned attic or a conditioned attic. Warm moist air enters the roof space through gaps in loft hatches or where bathroom plumbing or other services go through the roof space. Think of a cold drink sitting out on a summer day. When humid air from the interior makes contact with the underside of the roof surface the water vapor it s carrying turns into liquid water explains jose f.

As it cools it can t hold as much moisture. Essentially condensation occurs at night when the temperature inside a building is warmer than outside. Warm wet air rises and meets the cold roof and cools. When this warm moist air hits the cold air in the roof space water droplets condense on the nearest cold surface the roofing felt.

Such cookers often allow for the quick rise of moist air leaving behind the cold air.