ᐅ Comparison of Precast Concrete Garages: Strength Classes C30/37 vs. C35/45

Hello everyone,
I am about to decide on a prefabricated garage.
- Supplier A offers one for about 15,000€ with C30/37 concrete.
- Supplier B: 17,000€ with C35/45 concrete.
(There is even supplier C with DIN EN 13978-1 and DIN V20000-125 standards.)

What are your experiences?
Thank you and have a nice Sunday.

What would you need increased compressive strength of the material for?
Since 2001, we have had a Juwel double garage made from two prefabricated garages in C30/37 and have had no reason for complaints.

hampshire schrieb:

What would you need a higher compressive strength of the material for?
Since 2001, we have had a Juwel double garage made from two precast garages in C30/37 concrete, and we have had no issues.

Thank you for your answer.

We would also like to use the garage as a roof terrace. Does that make a difference?

Yes, that does matter. It’s best to ask a structural engineer (informally), since the roof terrace might also be unofficial. Our garages have a green roof, and sometimes someone steps on it to retrieve a soccer ball.