Masonry garage - insulate the flat roof or not?

Hello everyone,

I have a question regarding a self-built garage. We want to build it soon. Our garage will be built directly onto our house and is separated from the house by a T30 door. According to the floor plan, it should be built exclusively from 17.5 cm hollow bricks and will have a wooden flat roof. The garage would then be uninsulated, so the question is whether it should also be insulated. On the internet, you can find many different opinions on this. My current position is that I should at least insulate the roof.

I would be interested to know how your garages were constructed. Do you have additional insulation on the outside? If you also have a wooden flat roof, was it insulated from below or above?

Thanks in advance for your feedback

Morning

Garage / workshop as a timber frame construction with flat roof.
Walls stud frame insulated with 24 cm and 60 mm wood fiber insulation board
Roof roof beams insulated with 30 cm
Concrete floor with underfloor heating

Olli

Moin Moin

Garage / workshop as a timber frame construction with flat roof.
Walls stud frame 24 cm insulated and 60 mm wood fiber insulation board
Roof rafters 30 cm insulated
Concrete floor with underfloor heating



Olli

this construction method is probably rather a special case for a garage. But as a workshop, it probably makes quite a bit of sense. Some houses in timber frame construction are not insulated that well....

With an uninsulated garage roof, there can be "problems" with condensation. If the roof is the coldest part, water condenses there and then drips down. But basically, a garage does not necessarily have to be insulated.

With an uninsulated garage roof, there can be "problems" with condensation. If the roof is the coldest part, water condenses there and then drips down. But basically, a garage does not necessarily have to be insulated.

On the contrary. In an insulated garage, you get problems with condensation in the summer if you do not ventilate properly. A non-insulated garage with good ventilation is actually the safest construction.

Ours is insulated, however. A flat roof with insulation from the inside is quite a complicated and error-prone construction. That should definitely be considered right from the planning stage, and in my opinion it is not a DIY project.

Heated garages, as far as I know, are problematic in terms of building regulations.