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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    A year ago I added some insulation up in the loft. 150mm between joists, then counter battened and another 100mm. (I know it doesn't quite meet regs but it's a hell of a lot better than before)..
    I then put chipboard down over the top, as it's a small house and we needed the storage space.

    My question is, how stupid was I? And how much condensation could there be on the underside of the chipboard?

    Could I simply drill a load of holes in the boards, or does it need lifting and counter-battening for an air gap?

    Advice appreciated,
    Should be fine, if the loft space is well ventilated above the chipboard. And if it's not well ventilated, expect condensation to form on the roofing felt/membrane before the chipboard.

    Why do you ask - does the chipboard look/feel/smell damp anywhere?
    All well ventilated with plenty of airflow under the eaves.

    No it all looks fine, guess I'm just concerned that the underside of the chipboard will be where warm air meets cold, and it'll slowly compromise the insulation.

    • CommentAuthortony
    • CommentTimeMay 24th 2019
    I always leave a 50mm ventilated air space above the top of the insulation and the bottom of the deck and I prefer Osb to chipboard
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