Calculate the statics for a garage

... And he built the whole house himself and therefore has some knowledge...

Just because you build a house yourself doesn’t mean you know what you’re doing :cool:
If he had known something about flat roofs with bituminous membranes, it probably wouldn’t have leaked, right?

Hello,

I see the chat is already somewhat older, but can someone provide me with the contact details of the structural engineer who prepared the static calculation back then for 300 EUR?

Best regards