Final answer:
Counter flashing is used in construction and roofing to provide extra protection against water infiltration by covering base flashing and being installed in the mortar joints, then folded downward.
Step-by-step explanation:
Counter flashing is installed in the mortar joints and then folded downward to cover the step or base flashing. In the construction and roofing industry, it is a standard practice to use counter flashing as an additional layer of protection against water infiltration at the points where the roof meets a vertical surface like a wall or chimney.
This technique is particularly important in ensuring that any water that gets past the base flashing is further diverted away from the building structure.
Counter flashing must be carefully installed to make sure it accomplishes its purpose effectively. Improper installation of counter flashing can lead to leaks and potential damage to a building's interior and structure.
Step flashing is installed in the mortar joints and then folded downward to cover the step or base flashing. It is commonly used in construction to prevent water from seeping into the junction between a roof and a wall. Step flashing directs water away from this vulnerable area, protecting the structure from potential water damage.