yes,drips are formed in the same way.
i prefer to use debotech torch on felts.yes lay perforated first or use polyester underlay and nail it down.if it is drips that you are fitting they should be fitted under the cap sheet and yes they will stick to the green mineral but make sure you heat them well(without burning through) and work quickly,they will cool down fast.to make drips,
the best way for you,will be to cut strips off the roll of torch on green,the length will depend on how deep the drip actually is,for a 3" down turn,the strips need to be 10 1/4" deep by the width of the felt (1m)this will give you a 3" fold and 4" to lay onto the roof with 1/4" to allow for the folds. the easiest way to cut them is to use a strip of scrap felt,cut it to the desired length ie; ten and a quarter inches.then roll out the mineral felt black side up,lay the strip along one edge and mark the felt then move the strip along and repeat,
do this to both edges until you have the required amount of drips marked out.then lay a straight edge across the marks and cut the felt,make sure you keep the cut as straight a possible.when you have cut all the felt you need for the drips,using a straight edge the same width as the downturn you need score a line along the length of the felt on the the black side and form the fold,once you've done this open out the felt and find the black margin on the green side,this needs to be cut to allow the felt to be joined properly.from the line you have just scored,cut down the edge of the black margin(where black meets green)on the short side,
then from the same start point make another cut going upwards but at about 45degrees towards the out side edge of the felt so that the off cut looks (as my old mate used to say) like half a house.this ensures that when you butt the drips together the black margin is not seen,now,
when you line the drips up with the edge of the roof and nail them you already have the crease for the fold,making sure the felt is straight with the edge of the roof will ensure you have a straight line of drips when you have finished.hope this helps.oh by the way,t
he best thing to use for scoring the line is an old screwdriver with the edge ground down but not to much of a point,make it quite rounded otherwise you will rip the felt,and don't apply to much pressure you just want to score through the bitumen not the felt as well,not enough and the felt will be difficult to fold,best to try it first on a piece of scrap felt.(my brain hurts now).
