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1940's semi detached - cavity insualtion

  • 04-07-2012 2:17pm
    #1
    kce
    Registered Users, Registered Users 2 Posts: 22 ✭


    Hi looking at buying a 1940's semi d - originally a council built development. We are led to beleive that the external walls are block built cavity construction (about 350mm in total width including plastering inside and out) and not breeze block. Given that it was built in 1949 and cavity block construction I'm led to beleive wasn't around for that long.......what are the possiblities of pumping insulation into the available cavity?? Need take a core out to see exactly what's there, but perhaps someone out there can recommend. There is some lining on the internal side in the form of plasterboard slabs and as the rooms are small i don't want to take off floor space by internally insualting further.

    External insulation is an option, but as the house was recently replastered it seems a pity to go down this route as well.


Comments

  • #2
    Bonus_Pack
    Closed Accounts Posts: 70 ✭✭Bonus_Pack


    Given that the house was built in the 1940s, i would be 80% sure that the cavity is very narrow, probably about 40mm and definitely no more than 60mm. My house was built in 1979 and only has a 40mm cavity. As a result, pumping that cavity will improve the U value, but it will still leave alot to be desired. So i would suggest external insulation but in order for that to be effective you'll have to fill the cavity anyway, especially if the cavity is open at wall plate level.
    You could just pump it, see how you get on and then opt for external at a later date.
    With a pumped 40mm cavity, your prabably looking at a u value of no less than 0.6 or 0.5.


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