luckily, every roof that famous puts on with a continuous flashing, is in my market, and maybe someday, i'll be getting calls to fix all of the leaky roofs.
Famous... have you ever actually been a ROOFER? I dont mean just someone who has sold roofs, and walked around on them with a tape measure. I mean packing shingles up ladders for a couple of years, ground cleanup, then moving on to tear off, maybe laying felt down... then after a few years of busting your ass, eventually learning how to shingle a roof?
because ive torn off shingles around here with ALL types of flashing. step flashing doesnt leak when installed properly. period.
oh, and you asking about putting step flashing where chimney pans, and at the base of dormers/etc are... is silly. nobody in their right mind would ever do that.
do you know the names, different purposes, reasons behind design, and proper installation techniques of the different types of flashing?
TAR on flashing? Why would you even have TAR on a freakin steep slope roof with shingles? REALLY? bro, you need to get your crew some good tin snips, a cutting wheel and have someone show them how to cut into rock, mortar, and install the counter flashing properly. you do know there are two parts to a chimney flashing, right? if things are flashed PROPERLY, all you need is metal, and nails. anything else is a band-aid for poor workmanship, or lack of knowledge on proper installation.