You most commonly use lead on roofs for the following applications:
- Cover Flashing,
- Step Flashing,
- Step Cover Flashing and Chimneys
- Lead Dormers
- and Lead Gulleys
Cover flashing is normally on a lower roof of a house (such as a porch for instance)..
The lead would be bent at normally 6" using 12" lead plugged into the bed of the brickwork, then lead mated and dressed to a professional standard. But the front of a chimney when leaded is also classed as cover flashing or the correct term is its called the front apron. .
Step flashing and cover flashing are very similar, step flashing is just 6" lead that runs up the end of your roof that meets a wall that rises above your roof..its marked on each bed joint cut ,plugged and dressed professionally, however you must have either lead of aluminium soakers that go under every tile from the bottom course right to the last this is done so the roof don't leak and the soakers won't be seen.
For starters you don't use soakers because you use 12" lead, you put a 6" bend in the lead and put it against the wall and do the same as step flashing, Mark plug and dress the lead neatly and the reason you don't need soakers is because you will have 6 inches of lead covering your tiles or slates that will be seen and will have to be neatly dressed.
They are simply you have your front apron that gets plugged and dressed, Then either step flashing with soakers (or cover step flashing) on the sides that get plugged and dressed and then you have your back apron that gets plugged and dressed. However you only have a back apron if your chimney is not on you ridgeline (top of the roof). Its only necessary when the chimney is below the ridge line .
Given the complexity of the subject it is always worth contacting us for impartial advice as to the best application given your particular situation / setup.