Wooden shed, how to make it frost-free?

Hi, during the last frost period I noticed that I probably need to insulate or heat our new wooden shed a bit more to keep it frost-free. When it was -3 to -5 °C outside, the temperature inside quickly dropped to -0.5 °C.

It serves as a workshop and accordingly, paint, silicone, tools, and of course a beer supply are stored inside.

At first, I thought of installing 20-40 mm Styrodur panels inside the compartments of the framework, but I only know Styrodur as either green or pink panels, which in my opinion would completely ruin the appearance. So I wanted to cover the Styrodur with a kind of thin plywood panel.

Therefore, I am now more inclined towards wood fiber insulation boards since at least in terms of color they would fit better.

The compartment has a depth of about 12 cm, with 40 mm wood fiber boards installed, leaving 80 mm to, for example, install shelves and still be able to use the compartment somewhat as storage space.

If I were to insulate walls and ceiling, that would be just under 60 m² at 5 €/m², so just under 300 € for the material.

Or all nonsense and just install a fan heater, and let it hum for the 300 € savings, or at 300 € you are also not far off from a split air-conditioning system from the hardware store — how much that makes sense is another question..

In the case of a shed designed as a workshop, I wonder how you previously intended to implement that conceptually? From my point of view, it is also questionable whether insulation is sufficient if there are simultaneously leaks. If these are present in the areas of floor and wall connections, in other words: if drafts easily penetrate through cracks and walls, even a lot of insulation won't help. Otherwise, your shed seems fairly reasonably constructed to me, just not as a warm space. Wood fiber insulation boards must not get wet, neither from direct moisture exposure (rain, rising damp) nor from dew/condensation water. They are therefore more sensitive regarding the wall construction. Why not use styrofoam in the compartments, tape everything as tightly as possible, and install tongue and groove panels from the inside? Various things can be well attached to this, unlike a purely visual plywood covering.

I would put an insulated cabinet in there for the delicate items. I would only do insulation if I want to use the hut as a person for an extended period in winter.

The thing with the isolated cabinet is also a good idea. Since it is purely a workshop/storage shed, work is really only done inside mainly in the summer.

By the way, insulation alone does not help/only delays heat loss. You also need a frost guard. Whether it's a shed or a cabinet...

Insulation alone does not help, by the way/only delays the heat loss. You also need a frost guard. Whether it's a shed or a cabinet...

Exactly right! A few days ago, when the AT dropped to -12 degrees, the IT in our unheated motorhome was also at -10 degrees.