◇ When a ladder is used to get on or off a roof or landing, the side rails of the ladder should extend at least three feet [1 m] above the roof or landing on which it rests.
◇ Ja kāpnes tiek lietotas nokļūšanai uz jumta vai kāda paaugstinājuma, to galam jāsniedzas vismaz metru virs augšējā atbalsta punkta.