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What is the counter flashing?

1) The metal skirt that covers the flashing or roofing material below flashing

2) The piece of metal let into the wood siding

3) The triangular blocking that allows the roof membrane to make two 45° bends

Answer :

Final answer:

Counter flashing is a component in roofing designed to prevent water entry by covering and protecting the upper edges of the base flashing. Installed above the base flashing, it is incorporated into a building's wall or adjacent structures, creating an additional moisture barrier.

Explanation:

Counter flashing, also known as cap flashing, is an important component in roofing that is designed to prevent water entry into a building. Counter flashing is typically installed above base flashing and is incorporated into the wall or adjacent building component, offering an additional layer of protection against moisture. There are several types of counter flashing, but generally, it serves to cover and protect the upper edges of the base flashing, which helps to ensure that any water running down the side of a building is directed away from potential entry points and does not penetrate beneath the roofing material.

Option 1) The metal skirt that covers the flashing or roofing material below flashing is a description that aligns well with the purpose of counter flashing, although 'metal skirt' is not a commonly used term. Option 2) The piece of metal let into the wood siding could also describe a method of installing counter flashing, but without context, it's less clearly defined as counter flashing. Option 3) The triangular blocking that allows the roof membrane to make two 45° bends does not describe counter flashing; rather, it suggests a description of a type of cant strip or similar roofing detail.

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