You may even see white, fluffy deposits inside your plaster – these are ‘salts’ which the damp has washed out of the bricks and into your plaster. Black spots of mould could also surface on over the damp areas of your wall. Audio for slide 6 (mp3 Take into consideration https://mould62469.answerblogs.com/32499502/an-unbiased-view-of-sub-floor-moisture