Question 1

Joist hangers are often used in upper floor construction because they&#10;A) Improve the fire resistance of the floor&#10;B) Decrease the eccentric loading on the external wall&#10;C) Improve the speed of construction of the floor&#10;D) Improve the resistance to air borne sound transmission of the floor&#10;E) Decrease the spacing of the joists

Accepted Answer

Joist hangers allow for quicker and easier installation of joists, improving the speed of construction for the floor. They do not have any impact on fire resistance, eccentric loading, air borne sound transmission, or spacing of the joists.

Question 2

Tongued and grooved joints are used to connect floorboards together because they distribute&#10;A) The applied load across the floor&#10;B) The heat flow across the floor&#10;C) The spread of flame across the floor&#10;D) The moisture level across the floor&#10;E) The sound waves across the floor

Accepted Answer

Tongued and grooved joints are designed to fit together tightly, creating a secure bond between the floorboards. This helps to distribute any applied load across the entire floor, allowing for a more stable and durable flooring system. The joints also help to prevent any gaps between the floorboards, which can reduce the moisture level across the floor. While tongues and grooves can also help to reduce the spread of flame and sound waves, these are not the primary reasons why they are used to connect floorboards together.

Question 3

Silent floor systems are so called because they&#10;A) Decrease air borne sound transmission through the floor&#10;B) Decrease structure borne sound transmission through the floor&#10;C) Have greater shrinkage than floors using solid joists&#10;D) Have less shrinkage than floors using solid joists&#10;E) Prevent footsteps being heard in the rooms beneath

Accepted Answer

D

Question 4

Strutting is used in upper floors because it resists&#10;A) Shrinkage of the joists&#10;B) Twisting in the joists&#10;C) Swelling of the joists&#10;D) Deflection of the joists&#10;E) Cracking of the joists

Accepted Answer

Strutting is used to resist twisting in the joists by providing lateral support, which helps maintain the structural integrity of the floor.

Question 5

Trimming joists are used to support&#10;A) The common joists&#10;B) The trimmed joists&#10;C) The trim joists&#10;D) The trimmer joists&#10;E) The header joists

Accepted Answer

Trimming joists, also known as trimmer joists, are used to support the ends of headers and transfer their load to other supporting members.

Question 6

Trimmer joists are thicker than common joists because&#10;A) They have to carry the load of the common joist&#10;B) They have to carry the load of trimmed joists&#10;C) They have to carry the load of header joists&#10;D) They have to carry the load of trimming joists&#10;E) They have to carry the load of the housed joists

Accepted Answer

Trimmer joists support the ends of the common joists that have been trimmed or shortened to accommodate openings such as doors or windows. Therefore, they have to carry the load of the trimmed joists.

Question 7

Using the 'rule of thumb' method for calculating the depth of a floor joist, the depth of a joist spanning 3.6m would be&#10;A) 150mm&#10;B) 175mm&#10;C) 200mm&#10;D) 225mm&#10;E) 250mm

Accepted Answer

The 'rule of thumb' for calculating the depth of a floor joist is to divide the span (in meters) by 20. For a span of 3.6m, 3.6/20 = 0.18m or 180mm. The closest standard depth greater than this calculation is 200mm.

Question 8

The ends of floor joists to upper floors are treated with&#10;A) Preservative&#10;B) Water repellent&#10;C) Insect repellent&#10;D) Salt repellent&#10;E) Infra-red reflective paint

Accepted Answer

The ends of floor joists to upper floors are typically treated with a preservative to prevent decay caused by moisture or fungal growth. This is important because the ends of the joists are often in contact with masonry or concrete, which can hold moisture and promote decay. Water repellents, insect repellents, salt repellents, and infrared reflective paint are not typically used for treating floor joists.

Question 9

A double floor is used when&#10;A) The floor decking spans in the same direction as the joists&#10;B) The floor decking spans in the opposite direction to the joists&#10;C) A solid partition is to be built on the upper floor&#10;D) A lightweight partition is to be built on the upper floor&#10;E) There is no loadbearing internal wall onto which the joists can bear

Accepted Answer

The answer of A double floor is used when&#10;A) The...

Question 10

Particleboard flooring is often used instead of softwood floorboards because&#10;A) It is stronger&#10;B) It is warmer to walk on&#10;C) It does not have tongued and grooved joints&#10;D) It is easier to install&#10;E) It is easier to remove to gain access to the void beneath

Accepted Answer

Particleboard flooring is often used because it is easier to install compared to traditional softwood floorboards.

Deck 12: Upper ﬂoors