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Home insulation

  • 04-01-2020 3:27pm
    #1
    kopvill
    Registered Users Posts: 15 ✭


    Hi folks a little advice needed, so we refurbed a bungalow (on a limited budget) re wire we knew about but a surprise replumb/new heating system soaked up our budget, we're going to re-insulate the attic area to improve heat retention (there's a spray paper insulation already there) but do we insulate the attic floor with rockwoll or boards or would we be better spray foaming the underside of the roof (we don't have any intention of converting this area) any advice re performance or price would be appreciated thanks


Comments

  • #2
    MicktheMan
    Registered Users, Registered Users 2 Posts: 2,867 ✭✭✭MicktheMan


    Keep your insulation in one plane i.e. on the flat. Insulating between the sloped rafters is a waste of money.
    Sounds like you already have cellulose insulation. What thickness? This can be topped up.

    Now more importantly, how's your airtightness?


  • #3
    kopvill
    Registered Users Posts: 15 ✭kopvill


    MicktheMan wrote: »
    Keep your insulation in one plane i.e. on the flat. Insulating between the sloped rafters is a waste of money.
    Sounds like you already have cellulose insulation. What thickness? This can be topped up.

    Now more importantly, how's your airtightness?

    Hi thanks for the reply, it's quite an old house, so it's not air tight at all, the insulation is very messy and is 100mm thick it was recommended to brig it up to 350mm but before we did I wondered if the spray foam would be money better spent...


  • #4
    MicktheMan
    Registered Users, Registered Users 2 Posts: 2,867 ✭✭✭MicktheMan


    kopvill wrote: »
    Hi thanks for the reply, it's quite an old house, so it's not air tight at all, the insulation is very messy and is 100mm thick it was recommended to brig it up to 350mm but before we did I wondered if the spray foam would be money better spent...

    Forget the spray foam.

    Make sure that there are no gaps in the 100mm insulation. There is no point in upgrading this if air tightness isn't tackled first.

    If "not airtight at all" then what you spend on making it more airtight will give you the best bang for buck by far.


  • #5
    monseiur
    Registered Users, Registered Users 2 Posts: 1,310 ✭✭✭monseiur


    Fit 150mm (6'') insulation over existing between joists and fit another 150mm the opposite direction over to give a total of 300mm, ensure not to cover vents at eaves etc. Before proceeding with this work check with SAEI - you may qualify for a grant for this and other related work you already have done or plan to carry out.
    M.


  • #6
    KramII
    Registered Users Posts: 5 ✭KramII


    We had so-called experts double the insulation in our attic space. They covered the eave vents and when I looked into the space above the insulation on a cold day it was dripping all over like rain. We had a builder add some high roof vents that cured the problem. I hope this was enough. Should we clear the vents under the eaves?


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