Unit 207 Floors and Flat Roofs - Assignments

List the different types of joists used in flooring construction.

• Solid lumber joists, I-joists, Open-web floor trusses

• Steel joists, Concrete joists, Composite joists

• Wooden joists, Metal joists, Plastic joists

• Engineered wood joists, Reinforced concrete joists, Hollow core slabs

Answer explanation

The correct answer lists types of joists commonly used in flooring: Solid lumber joists are traditional, I-joists are engineered for strength, and Open-web floor trusses provide efficient support, making them suitable for various construction needs.

The purpose of bridging joists is to:

• provide lateral stability to floor joists

• support the roof structure

• enhance the aesthetic appeal of the building

• increase the height of the ceiling

Answer explanation

Bridging joists are used to provide lateral stability to floor joists, preventing them from twisting or buckling under load. This is essential for maintaining the structural integrity of the floor system.

Timber joists should be checked to ensure the camber is upwards because:

• it helps in water drainage.

• it prevents sagging under load.

• it enhances aesthetic appeal.

• it reduces construction costs.

Answer explanation

Timber joists should have an upward camber to counteract the weight they bear. This design helps prevent sagging under load, ensuring structural integrity and longevity.

Compare traditional and modern ground floor construction methods.

• Traditional methods are more cost-effective but less energy-efficient.

• Modern methods are more cost-effective but less durable.

• Traditional methods are more durable but less energy-efficient.

• Modern methods are more energy-efficient but less cost-effective.

Answer explanation

Modern construction methods utilize advanced materials and techniques, making them more energy-efficient. However, these innovations often come at a higher cost, leading to the conclusion that they are less cost-effective.

The purpose of a fast-install insulated concrete floor is to:

• provide thermal insulation and quick installation

• enhance aesthetic appeal

• reduce noise levels

• increase structural strength

Answer explanation

The fast-install insulated concrete floor is designed to provide both thermal insulation and quick installation, making it efficient for construction while ensuring energy efficiency.

How are services (pipes and cables) positioned within floor joists?

• Horizontally through notches at the top of the joists

• Vertically through holes in the center of the joists

• Horizontally through holes in the center of the joists

• Vertically through notches at the bottom of the joists

Answer explanation

Services are typically positioned horizontally through holes in the center of the joists to maintain structural integrity and allow for easier installation and access, making this the correct choice.

Name two modern joist systems.

• Open Web Steel Joists and Wood I-Joists

• Concrete Joists and Hollow Core Slabs

• Timber Joists and Steel Beams

• Reinforced Concrete Joists and Precast Concrete Joists

Answer explanation

Open Web Steel Joists and Wood I-Joists are widely used modern joist systems due to their efficiency and strength. They provide excellent load-bearing capabilities while minimizing material use, making them popular in contemporary construction.

Steel strutting improves floor performance by:

• providing additional support and stability

• increasing the weight of the floor

• reducing the cost of construction

• enhancing the aesthetic appeal

Answer explanation

Steel strutting provides additional support and stability to the floor, enhancing its performance by distributing loads more effectively and reducing the risk of structural failure.

Identify different types of ironmongery used for floor joists.

• Joist Hangers

• Anchor Bolts

• Nail Plates

• All of the above

Answer explanation

Joist hangers, anchor bolts, and nail plates are all types of ironmongery used to support and secure floor joists. Therefore, the correct answer is 'All of the above'.

What are the benefits of using a joist hanger or jiffy hanger?

• They provide strong support for beams and joists.

• They are used for decorative purposes.

• They are primarily used in electrical installations.

• They are used to insulate buildings.

Answer explanation

Joist hangers, or jiffy hangers, provide strong support for beams and joists, ensuring structural integrity in construction. They are not used for decorative purposes, electrical installations, or insulation.