The Wonderful World of Wood-pulp

As explained previously (see The Importance of Fitting In) when we wrap our bungalow with strawbales the bedroom that projects forward of the main building will remain as brick outside, in order to visually tie the building with the other brick bungalows in the street and appease the planners (see Elevated Greenery).  This presents some problems.
We want the whole building to be very well insulated and maintain a comfortable temperature without central heating.  The cavity walls of the existing bungalow will be filled (with glass-fibre granules made from recycled glass) but this only gives a U-value of around 0.57.  To achieve a central-heating-free home, we need the external walls to have a U-value of around 0.15 or less (there's some explanation of U-values here).  The strawbale wrap will easily achieve this for most of the building.  But in order to retain the external brick wall of that bedroom some kind of internal insulation will be needed there.  This in turn, presents some problems.
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