Roof Structures

What is this type of roof structure called?

• Monopitch roof

• Pitched roof

• Monitor roof

• Flat roof

Which of the following Building Regulations DOES NOT apply to roof construction?

• Part L

• Part C

• Part G

• Part A

Select all the answers that relate to the required functions of a roof:

• Strong - it must safely transfer loads through to the building

• Weatherproof

• Resist the passage of sound

• Resist heat loss

• Resist spread of fire

Which of the following would not be a suitable pitch for a roof?

• 45 degrees

• 35 degrees

• 30 degrees

• 75 degrees

What is the function of a wallplate? You must select all the correct answers

• To transfer the load directly to the foundation

• To spread the weight of a rafter across the wall

• To provide a secure connection to a birdsmouthed rafter

• To prevent spreading of the roof structure

What is the name of the timber that connects from the ridge at the apex of the roof to the wallplate at the base of the roof?

• Purlin

• Ridgeboard

• Wallplate

• Rafter

Which of the following correctly describe the functions of a ceiling joist? Select TWO correct answers

• Ties the rafters together to prevent spreading

• Prevent deflection in the ceiling joists

• Support the ceiling to the room below

• Spread the load of the rafters

What might be the effect on the walls of a building where the roof structure that is not sufficiently strong?

• The roof will sag

• The external walls will deflect

• The foundations will fail

• Water will ingress through the cavity wall

What do we call the timber that is supported by the pine end walls, running perpendicular to the rafters?

• Rafter

• Tie

• Joist

• Purlin

What is the purpose of a Purlin? Choose TWO correct answers.

• Supports the rafters, usually at the midpoint

• Allows the use of smaller section timbers in a cut roof

• Ensures the roof resists the spread of fire

• Prevents moisture ingress into the roof space