Condensation inside roof space

[elponko]

I've been reinsulation my loft and noticed that there is a lot of condensation on the inside of the roof. (black felt type lining). I think the previous owner went a bit far and blocked up all of the eave space with fibreglass which i guess would have restricted airflow? I've managed to get most of this out, but can't get to it all as it is rammed a few feet down and have only reinsulated the 'flat' bit of the loft, leaving a gap at the eaves. The roof has three vents in the ridge, although one of them looks badly fitted in the extension part of the house. I boarded over one part of the loft (the space is split in two by a 2 foot thick wall with an access hole in it) an noticed drip marks on the boards. anything else I can do to stop the condensation. Some of the older supports are feeling soft.
Cheers.

 

[datarebal]

i guess its that time of year again... you could increase your ridge ventilation, also you could try putting a spacer in between the felt laps between rafters. you will be amazed at the breeze you can feel .. ventilation is good..

 

[JohnD]

//www.diynot.com/forums/viewtopic.php?t=160032

 

[elponko]

thank for the info. spacers... how long should they be? or does that depend on how big the overlap of the felt is? and how do i fit them? i'm clueless on roofs, i'm afraid.