I have a 12ft x 9ft loglap Summerhouse/Shed with 3" treated framework.The shed is lined with the brown wax type paper.Can you advise on best type of insulation to prevent mould etc.

hi, we use polystyrene sheets then board over with ply and baton the joints to make it look tidy then it can be painted if required

hi insulation is not nessesarily your problem it may be ventilation. People often think if its wet seal it. We had a really bad winter a deep freeze. and thaw means wet. Insulation such as foam boards keep in moisture as well as heat. Leave space between stored items and ensure air movement this may solve your problem I you do opt for insulation foam boards with reflective surface may be best option to retain space. Still ventilation is vital.

Go to Knauf site and they spec what you need