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Droplets forming on roof felt

  • 16-12-2008 9:05am
    #1
    um7y1h83ge06nx
    Closed Accounts Posts: 5,029 ✭✭✭


    Hi,

    I have a problem that I only noticed Sunday evening when I went into the attic to take down some decorations.

    I noticed while up there that they are numerous water droplets formed on the inside of the roof felt.

    It is a semi-detached house, almost 15 years old. I never noticed this before but I have only had the house for 3 years and have never really fully climbed into the attic before. The only major work I carried out was replacing the timber fasica with PVC earlier this year.

    Any ideas?


Comments

  • #2
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    Condensation - warm air meets cold felt.

    Did you install adequate vents in new upvc soffit / fascia?

    Good ventilation of the roof space will solve the problem. There are a number of recent threads on this subject.


  • #3
    um7y1h83ge06nx
    Closed Accounts Posts: 5,029 ✭✭✭um7y1h83ge06nx


    Thanks for the reply.

    I should have done a search before I posted, noob mistake.

    Thanks.


  • #4
    ShowAndGo
    Registered Users, Registered Users 2 Posts: 68 ✭✭ShowAndGo


    I have a similar problem at the moment.

    I think mine is because a lot of heat seems to be travelling up to the expansion tank in the attic. I went up the other day and the expansion tank was pretty warm and there was a lot of condensation on the roof felt dripping down onto the insulation.

    Nothing like having a radiator in the attic space...keep the mice warm!


  • #5
    jack of all
    Registered Users, Registered Users 2 Posts: 2,376 ✭✭✭jack of all


    It's also very important that any tanks in the attic (header and cold water tanks) have a proper close fitting lid fitted to minimise evaporation (in addition to the hygiene issues!).


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