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polystyrene

  1. Celotex Vs. Polystyrene ?

    T4 Conversions
    Afternoon all. Just a quick one, has anyone used polystyrene for the insulation ? 25mm on top and 50mm on the bottom ? Is Celotex or kingspan etc. really that much beter ? Just that I have some polystyrene left over from a job I've just finished. I'll be using flashing tape and foil bubble stuff...
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