Cracks all around new extension. what could be causing it

[Notch7]

The amount a piece of wood will shrink along its length ( longitudinal shrinkage ) is typically 0.05% to 0.25% pf the length depending on specie and moisture content before drying

You beat me to it!

What Noseall is saying is still sound advice

 

[platforminc]

One thing I should say.
The skirting is mdf not timber.
What's the best way to go about fixing to ensure a neat job.

I'm on my own now as builder has been paid in full.

 

[^woody^]

Caulk