Loft Roof Lining Wet

Your roof timbers look wet.

Loft roof lining wet.

The loft space should have adequate ventilation to prevent the build up of moisture to an unacceptable level. Used to eliminate any dust dirt or moisture from entering your loft space our breathable roofing membrane can be installed directly into the either the internal or external roof slopes shielding both insulation and roof structure. Take a measuring device tape measure or a laser measure and measure the rafter area this can be done by measuring from the apex of the roof down to where the sloping roof meets the horizontal joists and multiplying by the breadth of the roof. Water vapour can pass through most building materials and will enter the roof space through the plasterboard ceilings.

Steam from activities such as bathing and cooking combining with a lack of general ventilation to create excessive moisture rising into the loft. Unfortunately placing boxes and possessions in the loft can disrupt the airflow and render the vents useless. When measuring your loft space here is a simple guide. Good construction practice requires a vapour barrier to be fitted on the warm side of the insulation to stop warm moist air from inside the house permeating through the ceilings to the cold loft.

Hot water tanks releasing steam and moist air into the loft or roof space. When the temperature drops one side of my roof which faces north west gets severe condensation which drips constantly and makes the insulation and stuff in the loft wet. These vents are usually located at the eaves the lowest part of the roof. You should have air flow in your loft you need to make sure your insulation is not blocking this flow at the eaves.

Roof vents have been covered or blocked by storage boxes or other items stockpiled in the loft. Mater 30 dec 2009 4 lee1982.