>> >>>How's the sealing? Have you bunged all the holes up? Windows?<<<
>>
>> But since this month you now have to have extra trickle vents installed in new
>> fit replacement double glazed windows - even if they are capable of being opened. Why?
To ensure good ventilation/air quality. It probably didn't matter when all houses leaked like a sieve. You still need additional ventilation for gas appliances without an external air supply so if you have a gas hob or woodburner using internal air they will want you to knock further holes in your walls.
The chap who did my air leakage test said that the better built developer houses now are typically hitting 5m³/h.m² @ 50 Pa (building standards max is 10) which he thinks is borderline for decent ventilation unless you have MVHR. (they do the tests with window trickle vents closed).
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Insulation question new
Insulation question new