Flat Roofs Quiz

What is the average lifespan of a flat roof?

• 15 years

• 25 years

• 10 years

• 20 years

What is the definition of a flat roof in terms of slope?

• Slope of less than 5 degrees

• Slope of less than 10 degrees

• Slope of less than 15 degrees

• Slope of less than 20 degrees

How is the fall on a flat roof determined?

• By the location of the building only

• By the type of roof covering only

• By the type of roof construction and its covering, location of the building, and position of any surface water drain

• By the position of any surface water drain only

Which method of obtaining fall on a flat roof is used when a level ceiling is not required?

• None of the above

• Deepened joists (parallel fittings)

• Sloping roof joists

• Tapered firring pieces

What governs the maximum clear span for imposed loadings in flat roof construction?

• All of the above

• Spacing of joists in relation to covering and imposed loads

• Dead loads imposed upon sectional areas of roof

• Sectional sizes and grades of timber

What is the first step in covering a flat roof after installing the joists and firrings?

• Securing chipboard sheets to the joists

• Sweeping the roof

• Pouring hot bitumen onto the roof

• Inspecting for sharp edges/parts

What is the purpose of laying the second layer of underfelt in the opposite direction to the first layer?

• To provide more strength

• All of the above

• To ensure waterproofing

• To create crossed joints

What is the purpose of flashing around a chimney in flat roof construction?

• To prevent water from leaving the roof

• To provide waterproofing

• All of the above

• To create a drip directing water into the gutter

What is the final step in covering a flat roof with green mineral felt?

• Tucking and doubling the eaves to create a drip

• Raising the other edges to prevent water from leaving the roof

• All of the above

• Laying the felt in the same direction as the fall on the roof

What is the main purpose of a flat roof?

• To provide additional living space

• To cover garages or small extensions

• To provide better insulation

• To enhance the aesthetic appeal of a building