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Condensation on roof felt

dexterwolf
Posts: 360 Forumite

We get condensation on the roof felt in the loft. Does anyone have any ideas what can be done for this? .
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Comments
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VentilationI am not a cat (But my friend is)0
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Yes - soffit vents.0
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Polystyrene wedges in between each of the rafters to separate the layers of felt and allow air to flow through. Ridge or tile vents can be added if this doesn't cure it followed by sofit vents if you still have a problem after this.0
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Have you got extra insulation, ie. what is the depth? Also have same problem. Extra ventilation hasnt helped in my case. Roof gets cold due to 2 layers of insulation and when close to freezing outside, condensation forms on felt which is original bitumen type, non-breathable. Allegedly new breathable membrane may prevent it but that's a new roof cost of several 1000s. Condensation can actually drip alot onto surfaces below. We have a soil sub floor which gets damp in winter so this wont help.0
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