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Attic/Wall insulation quote

  • 04-05-2022 4:23pm
    Registered Users Posts: 8 greyhound87

    Hi all,

    Just looking for opinions on a quote for attic/wall insulation plus other bits. We are looking to get the grant that the SEAI has and thought getting a quote would be a good idea.

    House net area is: 170m2 - built mid-80s. No vents. Cavity width 50mm.

    170m2 bead cavity wall insulation - 1700

    6 wall vents - 660

    70m2 200m eathwool - 840

    Tank/pip wrapping - 150

    20 soffit vents - 120

    4 OSB sheets 8x2 on 6x2 storage platform -230

    BER - 300

    Total w/vat - 4540. Pre-grant.


    Is this quote reasonable? The people quoting it seemed very competent.

    One big issue I have with the quote is the inclusion of wall vents. Fair enough if its required under the regs but surely 6 4" wall vents in each room will negate any sort of benefit that the cavity beads/attic insulation gives!? I would prefer these not included tbh. There has been no sort of mold issue and can't say the house air has ever been stale.



  • Subscribers Posts: 38,432 ✭✭✭✭ sydthebeat

    The ventilation has to be provided as per the contractors code of practise.

    you may not realise it now, but when your house becomes warmer, it will retain a lot more humidity (water vapour) than it does currently. If you do not have adequate ventilation this water vapour will condense on cold spots and over time can lead to fungal growth which can in turn lead to health issues.

    increased insulation and increased ventilation go hand in hand.

  • Registered Users Posts: 8 greyhound87

    Ah, you are right. This makes perfect sense.

    The only issue is if this does not result in the house becoming warmer and these vents make everything worse.. 😅

  • Registered Users Posts: 2,716 ✭✭✭ MicktheMan

    "Cavity width 50mm."

    Make sure that a pre install detailed borescope survey is carried out to ensure that the 50mm cavity is in fact suitable to be pumped.

    On the ventilation question, as Syd says it is essential but just to mention that there are better ways to achieve good ventilation than the "hole in the wall" vents suggested. Depending on the shape / layout of the house, perhaps research Demand Control Ventilation (DCV) for example. More expensive yes but worth it imo over the longer term.