Cracking noise early in the morning in the bathroom.

[wedge69]

Some mornings, around 5am, we get awoken by a loud cracking nosie coming from the bathroom in our house.

I think this is caused by something contracting as it gets cold - the radiator in our bathroom has no TRV so it is possibly one of the hotests rooms in the house, and so I guess there is quite a temperature drop by this time in the morning.

However, I am confused as to what it is that is expanding/contracting to cause the noise. We've recently had a new bathroom fitted, and the differences between the two are that the new one has a tiled floor, a towel rail, an extractor fan and a shower screen.

Can anyone pinpoint the most likely cause? I thought it might be the shower screen or the towel rail as the metal would contract at a different rate to the plasterboard walls they were attached too? What can I do to solve this?

Cheers

 

[noseall]

squirrels eating their breakfast in the bath?

 

[mikric]

squirrels eating their breakfast in the bath?

Or try getting up real early one morning or turn the heating off earlier/later and try to pin point the area !! Sometimes you have to face the fact that all houses have there unique different sounds that are untraceable