Rafter water damage

[Jamespf1]

Hi all,

The tops of my rafters are wet. The wood is solid and not spongey. The felt lining is also wet on the inside.

I’ve noticed on my roof the verge tiles have slipped. And I noticed that huge chunk of mortar on the sides of the verge is missing. This is low Down on the roof

Where the verge is missing mortar the rafter inside the roof within 2m all have the tops wet. And even higher up than the location of missing mortar.

Is it possible that these rafters are wet from the missing mortar on the verge? Even though where the missing mortar is is lower down and affected rafters are 2m away.

Or is it possible I have a leak higher up.

As a result from this I have mouldy bedrooms where water is getting in.

Thanks

 

[Alastairreid]

Probably a combination of condensation, you have tar felt type1f which is non breathable and the mortar missing from the verge.
Have a look in the search how to mitigate condensation in attic.
The verge I would get stripped out and replaced with closers..same as your neighbours.

 

[^woody^]

Unlikely related to verge

If you have several similar patches and they are in varied locations relative to the roof slope, then you may have split felt or other punctures.

The best way to assess is to look at the rafters after a dry and mild even temperature period, then again after the next heavy or prolonged rain, and see if damp has increased.

Otherwise, condensation in an unventilated roof void will be worse after cold weather.

Do you have soffit or fascia vents?

You would not normally get mould to bedrooms from either condensation in a roof void, nor a roof leak. That may be a separate condensation issue in the house.

 

[Sonic70]

If the insulation in your loft is deep, maybe you've added more insulation recently, the house will be warmer but you've now made the loft colder and more likely to get condensation in there as the warm air enters the loft and hits a cold surface.