loft condensation

[bigfangdog]

This winter I've got condensation on the loft roofing felt all over. We've been in this house for about 18 months and this wasn't a problem last year. The only change I've done is to install a gas fired condensing combi boiler and removed the old solid fuel boiler. I've also removed all of the tanks from the loft and the copper pipework. I've blocked all holes where the pipes passed from the airing cupboard to the loft space. I've also checked the loft hatch door seal and double checked theres no more gaps anywhere. The new boilers vent is a good distance from the soffits so I'm pretty sure it's not that. The old flue pipe is still in place although obviously not used, this comes through the roof at the gable ends but isn't in the actual loft space. The loft ventilation isn,t very clever although I can see slight daylight from the darkened loft in a couple of places.
Any advice or suggestions would be much appreciated. Thanks

 

[markie]

install vent tiles or vents in the soffits for air flow , warm air / in contact with cold objects = drip drip

 

[federickmeensa]

hmm, i was wondering, i there actually a way to try to reduce condensation by not installing any sort of ventilation whatsoeva? we have a dehumidifier but that doesnt seem to be doing much either

 

[bigfangdog]

I think I'll install soffit vents and see how that goes. I've got to get someone to remove the old flue from the roof so I could get some vent tiles fitted at the same time.
I just can't understand why I didn't have condensation last year?

 

[lj3287]

Have you moved the insulation at all?

LJ

 

[bigfangdog]

I've added more insulation but it's not blocking any airflow, I wish it was!
Thanks anyway.