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    • sevenhills
    • By sevenhills 13th Oct 18, 12:23 PM
    • 1,625Posts
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    sevenhills
    Loft warmth/insulation
    • #1
    • 13th Oct 18, 12:23 PM
    Loft warmth/insulation 13th Oct 18 at 12:23 PM
    I have recently boarded out my loft, not concerned about the insulation, but there are slight draughts under the roof tiles.
    I know some people advocate ventilation, but I can see slight movement of the cobwebs under the roof tiles/backing.


    Does this need rectifying, and if so how?

Page 1
    • Davesnave
    • By Davesnave 13th Oct 18, 12:39 PM
    • 26,392 Posts
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    Davesnave
    • #2
    • 13th Oct 18, 12:39 PM
    • #2
    • 13th Oct 18, 12:39 PM
    I would hope to see more movement of air in my loft than that on a day like today. With plastic soffits and their built in ventilation, the wind fairly whistles through my loft. No condensation worries though.

    If you have adequate insulation (270mm) directly above your ceilings, then a somewhat draughty loft isn't a problem, though I guess you can't have that much if the place is boarded-out. I laid a central walkway with Kingspan underneath and suspended plywood shelving in the roof truss 'Ws' to get over the problem, but nothing very heavy goes on those.
    A garden is never so good as it will be next year....
    • Tom99
    • By Tom99 13th Oct 18, 12:40 PM
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    Tom99
    • #3
    • 13th Oct 18, 12:40 PM
    • #3
    • 13th Oct 18, 12:40 PM
    A slight draft sounds good. What do you mean by 'backing'?
    • Grenage
    • By Grenage 13th Oct 18, 12:59 PM
    • 1,589 Posts
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    Grenage
    • #4
    • 13th Oct 18, 12:59 PM
    • #4
    • 13th Oct 18, 12:59 PM
    A slight draft sounds good. What do you mean by 'backing'?
    Originally posted by Tom99

    I assume he means felt.
    • sevenhills
    • By sevenhills 13th Oct 18, 3:32 PM
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    sevenhills
    • #5
    • 13th Oct 18, 3:32 PM
    • #5
    • 13th Oct 18, 3:32 PM
    A slight draft sounds good. What do you mean by 'backing'?
    Originally posted by Tom99

    Looks like black layers of rubber/plastic material.

    • Davesnave
    • By Davesnave 13th Oct 18, 4:53 PM
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    Davesnave
    • #6
    • 13th Oct 18, 4:53 PM
    • #6
    • 13th Oct 18, 4:53 PM
    Looks like black layers of rubber/plastic material.
    Originally posted by sevenhills
    It's probably the stuff made from bitumen impregnated material which doesn't 'breathe' like modern membranes. That's a disadvantage, because in cold weather and higher humidity water can condense out of the air on it, drip off and cause dampness.


    That's why it's good to have some air flow up there, to keep it dried-out, just like washing dries better on a windier day.
    A garden is never so good as it will be next year....
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