How can a porous wall or roof have its' vapour resistance improved?

Question

Quizplus · Accepted Answer

Adding a layer of polythene film can increase the vapour resistance of a porous wall or roof. This can be done by adding the film to the inside or outside surface of the wall or roof. This will help to reduce the amount of moisture that can pass through the wall or roof and into the building, which can help to improve the indoor air quality and reduce the risk of mold and mildew growth.

How Can a Porous Wall or Roof Have Its' Vapour