I only assumed that dust was coming in through the ducts because it seemed most logical, but no anymore. I'll have to get it checked out though.
My solution is…

Hi Stewie,
We have a tiled roof, and no, we don't have sarking under the tiles.

Hi,
My house was built in 2014, and ever since I've had problems with rats and a lot of dust coming into the house (through the heating ducts) on a regular…