Installing wood panel ceiling with different wall dimensions, old house

[Vassalena]

Hello!

I'm going to install wood paneling on the ceiling in a small room where one side measures 148 cm and the other 144 cm. How should I approach the first board? Insulation, etc. should also be added before the ceiling is fixed.

The house is old and uneven, so I have to adjust accordingly. See image if it helps.

 

[Jansson69]

You can pull the panel boards apart by a millimeter per board if it's tongue and grooved so that it doesn't show a 40mm difference at the end.

 

[heimlaga]

You can spread the panel boards a millimeter per board if it’s tongue and groove so that it doesn't show a 40mm difference at the end..

Exactly so

 

[Vante]

Plaster, smooth white ceiling, maybe?

 

[Vassalena]

One can separate the panel boards by a millimeter per board if it is tongue and groove so that it doesn't show a 40mm difference at the end...

Thank you! Did so and the difference at the end became significantly smaller. It's also not visible that the panel "drifts" a little!