Hi all, I have a few probs at the minute. The roof felt in the loft is suffering from masses of condensation, the trusses are moist and the water is dripping off the felt, this is causing damp on the insulation and ceilings beneath. I believe the felt to be non breathable bitumen type.
I have attempted to rectify the problem by adding lap vents for air movement in between the felt, I can't see any other form of ventilation, no visible tile vents, sofit vents etc.
One of the probs is I can't feel any air coming in from any of the lap vents, I don't know if the felt overlap is too much or if for some other reason there is lack of air movement under the roof tiles?
I have also noticed that near the ridge the felt overlap was done the wrong way by some utter idiot, so that if water were to get under the ridge and top 1 or 2 rows of tiles and get onto the felt below, when its running down the roof it will come straight through the felt. Is this at all rectifiable from inside the loft by manipulating the overlap correctly?
There is also a cold water tank in the loft and there is no lid, so I'm wondering if that is contributing to moistness and condensation? The insulation seems fairly consistent and the loft hatch is secure and insulated and theres no bathroom vent to worry about bringing warm moist air into the cold loft space.
Any thoughts on how to resolve please? TIA
I have attempted to rectify the problem by adding lap vents for air movement in between the felt, I can't see any other form of ventilation, no visible tile vents, sofit vents etc.
One of the probs is I can't feel any air coming in from any of the lap vents, I don't know if the felt overlap is too much or if for some other reason there is lack of air movement under the roof tiles?
I have also noticed that near the ridge the felt overlap was done the wrong way by some utter idiot, so that if water were to get under the ridge and top 1 or 2 rows of tiles and get onto the felt below, when its running down the roof it will come straight through the felt. Is this at all rectifiable from inside the loft by manipulating the overlap correctly?
There is also a cold water tank in the loft and there is no lid, so I'm wondering if that is contributing to moistness and condensation? The insulation seems fairly consistent and the loft hatch is secure and insulated and theres no bathroom vent to worry about bringing warm moist air into the cold loft space.
Any thoughts on how to resolve please? TIA