Revisions log for Answer #131
This is the answer to the question What prefabricated garage to choose – concrete or steel?
Revision 1
I have a 9m double steel garage where we also use the back to store gardening tools, kids toys, bikes, car supplies, tools, etc.
One of the main reasons was that we don't have 6m wide available. Steel garages are of course much more flexible and compact in this regard. Our steel garage stands on a U-shaped foundation and is asphalted.
In the beginning, we had moisture on the floor. When I put something down, there was a wet section of sidewalk underneath. I also had rusty tools at the time. But after a while that went away. For water dripping from above, manufacturers usually offer a coating.
I have an acquaintance who has a steel garage without this coating, and he told me that he occasionally gets drips on his ceiling and car when the weather is inclement. But the number of days can be counted on the fingers of one hand.
However, in my opinion, a steel garage is much better at retaining moisture than a precast concrete garage. In my opinion, you need to think a little more here when you want to attach something to the walls. (Electricity/hanging for garden tools, etc.).
One advantage of concrete garages, in my opinion, is that they should filter out temperature peaks better. In a steel garage you only have cold beer in the summer with a cooler :), and in the winter it freezes.
I don't know what the empirical values are for precast concrete garages.