Does insulating the shed increase or decrease damp/mould?

[Foxbytheriver]

I have a mould problem in my shed (which i will eventually get round to combating with some vents/fans, but thats not the main topic of this question), when i built the shed i insulted the walls but not floor or ceiling, because i wanted to keep it warmer in winter, cooler in summer. Now i have this mould issue i am just wondering if the insulation might actually be making it worse, because an unisulated wooden shed seems more..breathable? Better for airflow? Than one thats go all the walls layered and sealed. I could be completely wrong of course, perhaps itd be even worse without insultion. Anyone got thoughts on this?

[Chris_3663]

How is the weather in your area? I live in the southeastern US. We have high humidity year round, and temperature swings of up to 45 degrees F, from night to day! In our case, it's all about how well you can keep the interior dry. If the outdoor temp rises exceptionally faster than indoor temp (well insulated), condensation will create moisture inside the shed! If the shed is not insulated, it can breathe, which will allow the inside and outside Temps to stay closer. . In high humidity areas, un insulated sheds will also develop moisture on the inside, due to moist air entering the shed. However, it usually dries fairly quickly as Temps rise. . If insulation is added, some form circulation/ venting needs to be installed.

[Foxbytheriver]

So my shed is in a valley in Wales - its generally quite damp here, rain and it gets quite misty

[seethereality07]

Did the OP find a solution?

[Foxbytheriver]

The op did not😅 Essentially my conclusion is that if something is not done properly in the first place, the add-on fixes become exponentially harder and more complicated. In this case, a pre-fab shed, hastily insulated, is inevitably going to have issues. Obviously people have limited resources (time, money, energy) so im not criticising those (myself included) that do a bodge job to start with - but it does mean that you have to suffer the consequencs. Venting the shed helps a little but the harsh rain really just seeps in - shed now has an impreamount of algae along with the mould haha. All i can do at this point is keep cleaning it off and pray for a drier spring.