300 custs - 15000 windows! That's 50 per house, they must be some superb granny flats
. I assume you mean 1500.
I see your point but daz has only recently started wfp-ing and so for him I'm sure trad will be faster on lower windows. Perhaps he isn't willing to waste time learning when he can be quicker on upstairs windows and trad downstairs, cut plenty of time off his trad/ladder speed and still gain confidence and experience with wfp on the uppers. Perhaps after a year or so he may agree but as it stands mixing the two methods is by far the best way for him to go it seems.