Insulating the interior of a garage, insulation wool/vapor barrier, which building materials?

Hello everyone,

This will be my first post in the forum and I hope I can get some help.

In short, I want to insulate my garage from the inside.

We built new in 2011. Detached single-family house. Since we don’t have a basement, the house connection room including the heating system was moved into the garage.
So now the heat pump, the tank, and the house connections like telephone, electricity, and water are located in this garage. When the heating was installed, a small radiator was also installed directly in the garage so that the temperature does not fall below 0°C in winter. After all, the water meter should not freeze.
Last winter, the temperature in the garage also did not fall below 6°C. However, last winter was not very cold.

I now want to additionally insulate the garage from the inside over the course of this year. It is not to be used as living space. I just want to gain a few degrees to protect the water connection from freezing in a harsh winter. The heat pump and the tank will surely benefit from a few degrees as well. So far, I have not had any moisture problems there.

Now about the garage. It is a prefabricated garage from the company Hundhausen.
7-10 cm reinforced concrete walls/ceiling with waterproof "Edelplastikputz" roll plaster on the outside and simple paint on the inside.
The roof is sealed with a bitumen/latex emulsion. This will probably be renewed by a professional in 5 years, or at the latest in 10 years.

A double-walled insulated sectional door has been installed. Its thickness is about 3 cm. I still want to clad a steel door from the inside with Styrofoam.

I want to insulate the ceiling, one side wall (the other side adjoins the house), and the back wall where the door is installed. How do I best go about this?

I was thinking of 5 cm thick Styrofoam panels and then gluing them to the wall. But I don’t know if this could cause condensation. So far, the garage has remained dry.
Or should I rather build a frame construction with battens and then insulate it with mineral wool and a vapor barrier?

Unfortunately, I don’t have much space on the ceiling because of the door, so the insulation should not take up more than 8 cm at most.

Do you have any suggestions on how I can accomplish this?

Hello,

We built new in 2011. Detached single-family house. Since we do not have a basement, the house connection room including the heating system was moved into the garage.
So now the heat pump, the storage tank, and the house connections such as telephone, electricity, and water are located in this garage. When installing the heating system, a small radiator was installed directly in the garage so that the temperature does not fall below 0°C in winter. After all, the water meter is not supposed to freeze.
Last winter, the temperature in the garage did not fall below 6°C. However, last winter was not quite as cold.

I want to insulate the garage additionally from the inside during this year. It is not intended to serve as living space....

I am quite irritated...

In all our inquiries about accommodating house connections/technology in a prefabricated garage, we were refused if the intended room was not insulated/furnished like living space. That is why, in such construction projects, no prefabricated garages were provided, but rather masonry garages were built.

Was your building application approved without conditions knowing that the house connections/technology were to be housed in the prefabricated garage?

Kind regards

Yes, free of conditions. Since we indicated directly in the building application that the garage is heated (it already is by a panel radiator) and will be additionally insulated. And the insulation is now being tackled by me. In this respect, one can say that we have imposed the "conditions" on ourselves. By "Should not be used as living space..." I meant that we do not want to stay overnight or set up there.

Hello,

Yes, no requirements ... In a way, you could say that we made the "requirements" ourselves.

Not quite – the requirement "insulation" would have been made anyway; it is the usual practice of the building authorities to require rooms outside the actual living space, which serve to accommodate the main connection or technology, to be designed like "living spaces." This is also understandable for laypersons, I think.

Thanks for the answer! Now I am relieved again

One more "curious" question. Was the supplier of the turnkey garage so inexpensive that adding insulation afterwards pays off, or why didn't you plan with a masonry garage from the beginning? The numbers I know suggest that you end up roughly breaking even, but with less effort and stress.

Best regards

So the prefabricated garage as it stands now cost about 4500. The insulation will be added to that. A masonry garage, fully insulated, was estimated by the contractor at 15000. We then decided in favor of the prefabricated version.

Maybe an idea:

Simply isolate the affected part? Like an isolated room in the garage?