No insulation (and no space for it) = damp

MouldyOldDough
MouldyOldDough Posts: 1,783 Forumite
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What do you call the roofline of a 1950's semi  - when the roofline on the first floor is such where the ceilings are virtually touching the tiles - on the outside 3 feet of the rooms ?
So the house looks like it has a skirt on it.

We have such a property and damp is now appearing on the ceilings
«134567

Comments

  • stuart45
    stuart45 Posts: 3,988 Forumite
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    Do you mean a Mansard hipped roof, as on the Cornish PRC homes?
  • Doozergirl
    Doozergirl Posts: 33,813 Forumite
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    A picture speaks a thousand words!
    Everything that is supposed to be in heaven is already here on earth.
  • GDB2222
    GDB2222 Posts: 24,661 Forumite
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    If it is 70 years old, or so, the roofing felt may have reached the end of its lifespan?
    No reliance should be placed on the above! Absolutely none, do you hear?
  • stuart45
    stuart45 Posts: 3,988 Forumite
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    A picture speaks a thousand words!
    Here's one of a Cornish PRC with a full length skirt

  • stuart45
    stuart45 Posts: 3,988 Forumite
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    Here's one for the lads. Cornish PRC type 2 with a mini skirt.

  • MouldyOldDough
    MouldyOldDough Posts: 1,783 Forumite
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    edited 16 March at 12:17PM
    @Doozergirl
    Its like this - the whole roof structure sits about 2 ft lower than a "normal" roof
    leaving a sloping ceiling at the edge of rooms on 1st floor
    the felt is fine as are the actual tiles (the roof is NOT leaking - the damp comes from inside)
    I understand that clear water is a sign of condensation - whereas brown or yellow staining is a sign of a leak
    We've got stacks of insulation in the main roof - just not at the edges because there's no space for it
  • stuart45
    stuart45 Posts: 3,988 Forumite
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    That's known as a collar roof. It common to get condensation there, as there's often no insulation. Best to use something like Kingspan.
  • MouldyOldDough
    MouldyOldDough Posts: 1,783 Forumite
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    edited 16 March at 3:43PM
    stuart45 said:
    That's known as a collar roof. It common to get condensation there, as there's often no insulation. Best to use something like Kingspan.

    I don't believe that there is even a big enough gap to get a board in there - when viewed from above, it looks as if it is tight up against the rafters.
    Also - it appears that a collar roof only works when the span is less than 4 metres - ours is double that - 8 metres !!
    (the full house width)
  • ThisIsWeird
    ThisIsWeird Posts: 4,844 Forumite
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    edited 16 March at 3:59PM
    I guess line the inside with insulated plasterboard? It'll also be more effective than insulation added to the other side.
    Mitre the board edges to fit nicely against the wall and upper ceiling. Jobbie should be jobbed?
    Photo of the inside, MOD?
  • in_my_wellies
    in_my_wellies Posts: 1,647 Forumite
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    My house has this sort of roof. The blurb called it 'galleried ceilings', it's 1908.
    When we moved in in 1883 the ceilings were black with mould in 4 of the bedrooms, mostly behind 1950's style hardboard built-in wardrobes. 
    We striped out the wardrobes and installed an airbrick in each bedroom and the problem has never returned even in the rooms which are largely unheated. I thought the airbricks would be drafty but TBH I don't even notice them now
    Love living in a village in the country side
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