I also had to be creative with the rainwater harvester pipework that forms a perfect draft path out of the house. A mixture of expanding foam and duck tape did the trick. British building at its finest!
The tester arrived as planned and setup his kit; a seal around the front door with a giant fan attached that sucks air from inside the house and blows it outside. The aim is to run the fan for 15 minutes and see how much of a pressure difference it can create between the two. The more air tight the house, the bigger the difference.
With several attempts and a lot more duck tape we finally managed to settle on a figure of 5.7, which is below the designed 7.0 mark. A good score and a pass!
The original paperwork said we should be able to achieve 2.5, but that would probably require wrapping the whole house in clingfilm!
