Graphical Construction Glossary >> Roofs and roofing. >> Roof Features >> Stepped Flashing

Stepped Flashing

A flashing that seals the sloping edge of a roof against a masonry or brick wall.

The photo shows a lead flashing to a slate roof. The main part to note is that the vertical face of the flashing material turns into a slot cut into the brickwork. Lead is the favourite material to use for slate and tile roofs because of it's ability to be dressed around the profile of the slate joints.

• The roofer first chases out the mortar joints of the brickwork (or masonry) to a depth of about 30mm.
• He fits the flashing from the bottom up, making sure that each section overlaps the previous one by a good margin.
• When the flashing is neatly in place small plugs of lead are driven into the gap of the brick joint to secure the top edge, and then the joint is caulked with mastic.

On metal roofs the procedure is the same with the flashing tucked into a slot and the sealed with a sealant that is compatible to the roofing material.

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Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900