External wall insulation - whats the best material?

Discussion in 'Home energy' started by Lara, 5 Mar 2019.

  1. Lara

    Lara Frequent Poster

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    Can anyone advise what is currently the best insulation material for external wall insulation? We are in a 1930's 3 bed end of terrace with raked ceilings and need to get insulation.
     
  2. noproblem

    noproblem Frequent Poster

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    How are external walls constructed, eg, are they built with a cavity between 2 layers of blocks? That will have a big bearing on the answer.
     
  3. Lara

    Lara Frequent Poster

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    They are solid block.
     
  4. noproblem

    noproblem Frequent Poster

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    Well that rules out cavity pumped insulation. Your next options are internal or external insulation. If your inside rooms are small I would advise you not to go with internal insulation as this would substantially lessen your space. You're then left with external wall insulation. There's a lot of stuff written about that topic elsewhere on here. Have you any damp in the house?
     
  5. Lara

    Lara Frequent Poster

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    We definitely don't have the space to go internal. There is damp in the curved part of the ceiling (the ceilings are raked) as there is zero insulation between that point and the roof. There is none anywhere else.
     
  6. noproblem

    noproblem Frequent Poster

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    By raked ceilings are you saying that they're the very high type giving a feeling of lots of light and open space? For a 1930 terraced house it seems the design known as "raked ceilings" wouldn't have been in vogue at that time, have renovations been carried out or is the house laid out as it was originally?
     
  7. Leo

    Leo Moderator

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    A lot of the 30's and 40's corpo stock houses had partially sloped ceilings along the front and back walls where the first couple of feet of ceiling followed the roof line. These are problematic in terms of insulation as there is very little space between this section of ceiling and roofing.
     
  8. RobFer

    RobFer Frequent Poster

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    Would you combine some internal insulation on the sloped ceiling here to assist the external outside?
     
  9. Leo

    Leo Moderator

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    I'm not an expert, but I believe this is probably the best way to deal with it, but you will still have some cold bridging at the top of the wall.