Pitch angle of roof? Height of parapet? Adequate landing and step-off at top of "fixed steps"? Are these "fixed steps" a permanent feature or something introduced for the task? Are there handrails? This "safe lane" - is it prone to slip risk? How is the pressure washer to be lifted up and down? Do you really want to use a pressure washer? Careful of the pressure. You may have a nice clean roof at the end of the task, but you might inadvertantly introduce leaks at the skylight interfaces! If the skylights are Class 2, extra protection, demarcation etc. could be construed as OTT. Just a few queries arising from your description, not intended as criticism.

Hi Ian, Random thoughts, probably considered by you: Is the roof construction certified 'non fragile', what is the life of any guarantee? Are the skylights non-fragile in the same way that the roof is? Is the parapet high enough? When you say 'marked by demarkation lines', is this something like marking tape or a rigid approach prevention method? WAH hierarchy - avoid - obviously you can't avoid doing it up there. prevent falls - hard stops in the form of work positioning restraints or rails around each skylight, not sure about wooden covers depending on their age, installation and the weight of the operators. If they fall onto the wooden cover will anything prevent them rolling onto the skylight? mitigate falls - consider netting below the skylights to catch the unwary or inattentive cleaning operator, maybe consider debris netting to stop broken bits of skylight getting to the area below, or cordon off the floor below where the team are working. Rescue plan - what if .... how will you get an IP or sick individual down, remembering that dial 999 is not a rescue plan. Quantify the risk and do the sums. Prevent any falls will result in happiness and everyone comes back to work. The opposite will have the opposite effect. Regards, S

the skylights are also non fragile the demarcation line is from TRAD and is posts and plastic chain as a visual reminder of a risk these are placed around the skylight 1 metre from the we dont want to spend extra money on precuations that are not neccessary otherwise what is the point of spending extra on a non fragile roof if you still have to fit netting, access line etc so i supose i am asking if it was your site and you had non fragile roof and skylights a good demarcation system and a good entry route and good PTW/RA/MS in place would you be comfortable or what else would you do that is not OTT

Ian it sounds to me that you know what you are doing, you've looked at this logically and put in sensible controls. Also you will be present to help with the supervision. Steve