well i must be stupid as i cant find it but if by pitch you mean turf then no you cant but the you dont come across that very often and when you do we use a gutter rake to break it up or hook it out first. trust me they are worth their weight or I wouldnt have spent £6k on them. we will charge about £70.00 for a 4 bed detached house with conserv, and it can be done in 20 mins, while the other guy is doing the windows for say £25.00 so thats £95 in under half an hour, how long do you think that would take with a ladder and how would you get the bit above the conserv? the first one i bought payed for itself after 3 weeks.