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Topping up open tank

Building regs are becoming increasingly stringent when it comes to insulation. The last two houses I've lived in have been new, and apparently not far off passive house standards.
When we extended our bungalow upwards, because we altered outline and capacity, we had to comply with all kinds of regs including insultion and ventilation. Result is that the triangular voids on three sides are so well ventilated that it blows like a hurricane through there and in winter the voids are so cold that ceilings of the rooms below get condensation on the outer perimeters but we had comply to get the work passed off by the council planners and that was 20 yrs ago. Also, since having cavity wall insulation, the double glazing has now become the cooler surface so they get condensation on now! My 220L nett open tank can use up to 2 Litres per day.
 
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