How and where can I find more info about this?

I want to create a round hole/window in a load-bearing interior wall made of concrete. The wall is between two doors, four meters long, normal height, and 250mm wide. I assume someone needs to do the calculations, but I was wondering if there are any guidelines like, "on a three-meter span, you can always cut a hole with a maximum diameter of 500mm":confused:
 
Click here to reply
Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.