This is the first piece of concrete that the system has to mount ... it’s common to take the walls up ahead of the slabs. The core and walls can run ahead of the slabs by three or four stories.

We may receive a commission on purchases made from links. Basement walls are frequently constructed with concrete. While concrete offers impeccable durability for a home's foundation, it's harder ...

Some aviation experts say the damage could have been minimized had the plane not collided with the concrete wall.