Best Timber for Office shed walls

[Luton Pete]

Hi all, I have recently put the Xtratherm insulation boards in shed and am now ready to cover with timber, what is best option for this? some kind of Moisture resistant boards or normal MDF?, I dont want to use plaster board. I am on a tight budget and have to watch costs,all help gratefully accepted.

 

[Mike13]

Unless it is heated 24x7 then an office shed will get damp in winter at night time.
Think about when and how you keep it dry, then decide what to clad it with that will survive those conditions

 

[Luton Pete]

So Maybe Moisture resistant MDF boards over the Xtratherm boards that are in place already ?