Title: Domestic roof construction - Wikipedia
Headings: Domestic roof construction
Domestic roof construction
Contents
Overview
Construction of a rafter roof
Construction of a truss roof
Design loads
Roof covering
Ventilation and insulation
Gallery
See also
References
External links

Content: this can lead to serious structural damage, wet or dry rot, as well as ruining the insulation in the roof spec. Condensation within the roof space is much more of a problem today due to: much less fortuitous ventilation due to tighter building envelopes with high performance windows and door and no chimneys leading. This tighter envelope means the air temperature in buildings has risen, the warmer the air in the building is, the more water vapour the air can carry. As the occupied part of the building has become warmer, the roof space has become colder, with high performance insulation and roofing membranes leading to a cold roof space. When the warm, moist air from below rises into the cold roof space; condensation begins as the air temperature drops to the ‘dew point’ or as the warm air comes into contact with any of the cold surfaces in the roof. Most building materials are permeable to water vapour; brick, concrete, plaster, wood and insulation all can fall victim to interstitial condensation, this is why UK Building Regulations require roofs to be ventilated, either by the use of soffit vents, ridge vents, or replacement ventilation slates or tiles. A common method of ventilating a roof is to make openings in the soffit and ridge to allow natural air flow.