New build and total renovation now require testing for air tightness, this makes it important to provide a good seal on every pipe/flue that pass through walls.
I always pack the inside with rockwall and then cement and the outside rubber collar i put a good bead of silicone ... granted pebble dash is a b*****r but Ive never had a call back for a leaky flue !!
I will want to see just which regulation is breached, if any.
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