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Loft insulation removal

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keithdckeithdc Forumite
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We are about to have our loft insulated and boarded.

To save money, I am removing the old insulation.

Just one problem.... there is some insulation stuck around the edges of the roofspace (we recently had our roof replaced, so not sure if it got stuck when they did that).

Do I need to make an effort to remove this or can I leave it as is?

Loft-space seems generally well ventilated.

Replies

  • societys_childsocietys_child Forumite
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    Always thought 6" of new insulation was laid over the existing 4" of insulation . . . 10" in the loft and all that.
  • keithdckeithdc Forumite
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    Always thought 6" of new insulation was laid over the existing 4" of insulation . . . 10" in the loft and all that.

    Generally yes.... but, our insulation is very squashed down, and of multiple different types.
    Recommendation from all installers that have quoted is to remove and start again (after much umming and ahhing).

    BTW- I believe the requirement now is 270mm (so 10" is not quite enough)
  • edited 20 May 2019 at 6:22AM
    DavesnaveDavesnave Forumite
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    edited 20 May 2019 at 6:22AM
    Removing the old insulation might be desirable, but I can't see how it will save money, because it will require disposal which someone (probably you!) has to pay for.

    I would get all the old insulation out, so there's no doubt about the responsibility for ensuring good eaves ventilation. Use a garden rake or similar.

    How much insulation you install is up to you. There's no magic figure, but the law of diminishing returns operates beyond a certain point, which may be around 300mm. I'd guess it's higher than that, but we're all guessing to an extent!
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  • d0nkeyk0ngd0nkeyk0ng Forumite
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    Squashed insulation means it's not effective - it needs trapped air to work (think of it like layers of clothing). Certainly at the eaves, there should be a small gap to allow ventilation in the loft. There needs to be a gap between the top of the insulation and the underside of the boarding. I used a loftzone kit to board my loft and it allows for a gap between the insulation and the loft boards. I imagine whoever is doing the work will do something similar but please check.


    IIRC the greatest difference is in the first base layer of insulation. The second 170 or 200mm layer gives a smaller improvement in heat loss.
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