Step flashing was put on the roof join of this new extension to prevent water getting in. The metal flashing was angled and bent to send water away from the corner joints and be directed away down the roof tiles and in to the gutter.
Flashing is the metal covering the roof join to the wall.
The flashing is tucked into the mortar.
What is Roof Flashing?
Roof flashing is metal sheeting that is cut and placed across joints and seams on a roof to cover the join and prevent water getting in. Typically it will be used at the base of chimneys, wall joins and roof valleys as these places are more likely to let water in.
The thin metal flashing is and carefully shaped and positioned, tucked into mortar joints and secured in place. It directs water away from the seams and toward the tiles and guttering.
Why is flashing made of metal?
Flashing can be made of metals such as lead, aluminium, copper, stainless steel, zinc alloy, or a metal with a coating such as stainless steel or lead-coated copper, the most common being stainless steel and aluminium. These metals are resistant to corrosion and so do not need surface coatings or regular maintenance.