I've got one of these Lyte TRL 240 roof ladders:

http://www.toolstop.co.uk/lyte-trl24...28-rungs-p2375

I bought it for a DIY job that I never got round to. A relative is
looking for a standard extension ladder. Would it be safe to remove the
roof-specific fittings and use it like a normal ladder? Those round
steps look a bit slippery for near-vertical use.