The vapour permeability test on my four samples is complete. Click here to see the original post about the experiment.
Here’s the brief background. I put 125ml of water in the containers on 03/08/19, covered them with various house wrap membranes, and waited to see how long it would take for the water to completely disappear.
Here are the results:
|MEMBRANE:||TIME TAKEN TO DRY:|
|1.Thermakraft Covertek 407.||40 DAYS|
|2. Bradford Enviroseal Proctorwrap – residential walls.||46 DAYS|
|3. Bradford Enviroseal Proctorwrap – roof sarking.||61 DAYS|
|4. Polyweave foil (non vapour permeable).||STILL FULL. NO DRYING|
As you can see, the vapour permeable membranes did their job at various intervals. The non-vapour permeable polyweave foil however, has done nothing, (this is why moisture gets trapped in the building assembly and leads to structural decay, rot and mould).