We have a simple summer cottage. It is partially insulated but leaves something to be desired in that area. The floor is insulated, but at some point, the insulation under the kitchen was removed due to leakage, so I want to restore it. It is easily accessible from underneath, but I don’t want to risk moisture around the water/drainage.

The walls consist of double layers of paneling and a paper-thin insulation :-) Considering replacing the paneling, so we can clear out the underlying material and insulate.

In the attic, there is insulation, but it is in rolls. I’m hesitant to just roll them out for fear of moisture.

Until now, we have completely shut down the heating, but the goal is to maintain a base heat during the winter.

Is there any guide to read/follow so that you do it right and also avoid moisture? Grateful for any tips!
 
As you describe it, it sounds like the cabin is on a post or crawl space foundation? Insulate the kitchen floor again, preferably with styrofoam, and then ensure that rats and mice can't gnaw on it, preferably with mouse mesh.

The walls seem to be straightforward to tackle. Remove old paneling, install a vapor barrier, frame up, load more insulation, install new paneling.

Clear out the attic, install a vapor barrier everywhere, fill the attic with insulation until it overflows.

Now, many people from Byggahus will likely come with various objections to what I've written, since it's an eternal debate about whether to have a vapor barrier, vapor brake, which materials to use, etc., etc. The brutal truth is that no one really knows yet today what is optimal, but I believe what I've written above comes closest, based on the knowledge we have today.
 
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