Describe what flashing is and where it is typically placed.
What will be an ideal response?
Flashing is made of thin materials that are impervious to water and are used to prevent water penetration and provide for water drainage. Typical flashing locations in roof construction include the roof perimeter, joints between roofs and walls, at expansion joints, and around objects, such as pipes, that penetrate the roof surface. Materials used for flashing include copper, galvanized steel, lead, aluminum, stainless steel, bituminous sheet material, and plastics. In some cases a combination of materials are used such as galvanized steel covered with bitumen, which prevents corrosion of the steel when in contact with mortar. Flashing materials often have different thermal expansion and contraction characteristics from those of the roofing membrane. These differences can cause cracking and tears in a roof material unless allowance is made for this movement.
You might also like to view...
All 125V, single-phase, 15A and 20A general-purpose receptacles mounted in an area of an agricultural equipotential plane are required to be of what type?
a. Twist load b. Arc fault c. Tamper resistant d. Ground fault circuit interrupter
Power recirculating ball steering gears may have sector teeth with a variable ratio.
Answer the following statement true (T) or false (F)
Like the Cairns Group, APEC has a free trade objective
Indicate whether the statement is true or false
Brake fade can occur due to ________
A) Gas fade B) Mechanical fade C) Water fade D) Any of the above