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Apologies if this is a very stupid question, but how do you know if plaster sounds hollow when tapped? I have very old plaster with cracks and when I tap in different places I can hear subtle differences in the sound but I can't tell what sounds hollow.

I have some new cracks opening up in plaster. The plaster is getting on for 20 years old and hasn't been redecorated in about 5 years. However, all these cracks are in the same area of the house - either side of an internal door and either side of an internal wall that has been knocked...

I am trying to sell my house and the surveyor has picked up some damp at the back of the house. You can see from the attached picture that the downpipe at the back goes back into the house and down into the drains under the kitchen floor and that the brickwork below is damp, suggesting some...