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Default insulating draughty cavity under ground floor boards?

On 24 Dec,
geraldthehamster wrote:

Approved Document L1B, 5.7 b. i. defines the replacement of an
existing layer as "stripping down the element to expose the basic
structural components (brick/blockwork, timber/metal frame, joists,
rafters, etc)..."

So I guess if you take up the floorboards, strictly speaking it's
notifiable. I wouldn't bother, and I bet nobody has.


Hasn't it to be more than 25% of the element to be notifiable? You did some
last year and some the year before etc. didn't you?

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