It can be hard standing, a car park corner or a flat roof that will take the weight.
The Sun (2008)
Suddenly we were outside, on a flat roof sprinkled with loose chippings that crunched underfoot.
Taylor, Andy TOY SHOP
On the flat roof of the house is a dome enclosing a large telescope.
Times, Sunday Times (2013)
We also had difficulty getting insurance because of its timber frame and flat roof.
Times, Sunday Times (2010)
In the ceiling a trap door and wooden ladder led out to the flat roof.
Kerr, Katharine A Time of War (1993)