It's banging in the ceiling for a few weeks. What?

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For a few weeks now, something began to bang on the ceiling. First a little gently. Then harder and harder. And more often.
It is the worst in the living room. Where the ceiling is 3.80 meters high.
The house is a Myresjöhus = wood with roof tiles from 2005.

It sounds very loud. As if someone is in the attic hitting the chimney with a heavy plastic mallet.

Yesterday, the house almost vibrated. It sounded as if someone dragged a heavy beam (scraping for about 1 second) twice. Very unpleasant!

My friend decided to record it.
He managed to record 2 hits. Not the scraping sound.

It always starts after 12:30 pm.

Called FB. They said I should investigate this myself.

The same was said by an inspector to me. He didn't even want to come and take a look...

Edit. I have no idea how to attach an audio file...

 

[Urban J A]

There is likely a loose sheet on the roof, when it bangs go out and take a look. It usually shows quite well what is moving, it could be any sheet that has come a bit loose. Securing it is usually simple. It is part of the normal maintenance one does oneself as a homeowner.

 

[Atom]

It is probably a loose sheet of metal on the roof, when it bangs go out and have a look. It's usually pretty easy to see what is moving, could be any sheet of metal that's come a bit loose. Securing it is usually simple. It's part of the normal maintenance you do yourself as a homeowner.

We have been up there and tugged on the sheets. Didn't hear anything though. Everything seems ok. What you're saying sounds plausible.

 

[Atom]

It's pounding hard. Barely audible from the outside. Even if you're standing by the chimney.
A lot on the inside. About 1 meter from the chimney.

I think I need to find a better inspector...