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What is the best insulation for a block wall

  • 21-09-2013 3:40pm
    #1
    Mickymac031
    Registered Users Posts: 1 ✭


    Just got full planning permission and was wondering what is the best way to insulate a block wall with a cavity. Any advice?

    Also what heating system would work best for a story and a half 2800sqft house?


Comments

  • #2
    beyondpassive
    Registered Users, Registered Users 2 Posts: 558 ✭✭✭beyondpassive


    There is no straigtforward answer to that question as you have to model your build in DEAP software to work out Part L compliance, if you are in the republic.

    In general the best solution seems to be 200mm EPS external insulation or a wide cavity with 250mm bead filled insulation. Both use a row or two of quinlites at rising walls and eaves/gables.

    There are many BER assessors advising on 150 cavity with additional drylining to the inside. This is a terrible solution as it elininate sthe thermal mass of the building and its ability to buffer changes in temperature, It is also an idiocic approach in that it creates thermal bridges at intermediate walls and floors, it is dangerous in that the Poly board material is not compatible with the plastics used for electric cabling and lastly, its also a pain to fix to.

    With Part L 2011,(60% less energy than a building build in 2009) the buildings should be designed from the outset to meet this onerous energy standard. Many houses are drafted up just to get planning and detailed design and buildability are kicked to touch. Its well worth getting 1:5 construction details drawn up by your Architect or whoever drew up plans.

    For heating systems the two most popular are LPG paired with Solar tubes, with an accumulator feeding underfloor downstairs and towelrails/low temp rads upstairs, or alternatively Geothermal or airsource heat pump paired with photovoltaic panels into a preheat tank and cylinder. Heat recovery ventilation is now standard for all builds we encounter, With sarking board warm roof, treble glazing, and a non back boiler stove like the stovax studio. (mandatory renewables in TGD Part L)


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