This is a lead flashing that is installed at the front of the chimney and overlaps the roof tile, whilst returning around the corners of the chimney and lapping underneath the side flashings. The lead front apron should have a minimum upstand of 75mm up the chimney to allow sufficient lap of the cover flashing.
This is a lead flashing that is installed at the back of the chimney. The lead is lapped underneath the roof tile and turned up the back of the chimney whilst returning around the sides of the chimney overlapping the side flashings. It is good practice to ensure the lead back gutter has a flat section also known as a sole board, this will help prevent build-up of debris such as leaves.
These lead flashings weather the sides of the chimney; they lap onto the roof tile and have an upstand up the chimney. Depending on the roofing material the side flashings can be in one long length lying on top of the roofing material or they can be cut into small pieces also known as lead soakers and fitted under each roofing tile.
This is a lead flashing that is fixed into a joint in the chimney and dressed over the lead upstands around the chimney. The lead is fixed with a lead wedge and then sealed with a polyurethane sealant. The lead cover flashing on the sides of the chimney can also be stepped if weather a brick chimney, these are known as lead step flashings.
If the chimney is positioned in the centre of the ridge, then a lead ridge abutment is required. This is a lead flashing that has a welded upstand up the chimney and is lapped with a return edge under the ridge. The detail of the lead ridge abutment will vary depending on the roofing material and type of ridge being used.