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Discuss in detail using notes and freehand sketches, three functional requirements of an attic space suitable for use as a bedroom - Leaving Cert Construction Studies - Question 9 - 2018
Question 9
Discuss in detail using notes and freehand sketches, three functional requirements of an attic space suitable for use as a bedroom. A traditional cut roof, which is... show full transcript
Worked Solution & Example Answer:Discuss in detail using notes and freehand sketches, three functional requirements of an attic space suitable for use as a bedroom - Leaving Cert Construction Studies - Question 9 - 2018
Step 1
Discuss in detail using notes and freehand sketches, three functional requirements of an attic space suitable for use as a bedroom.
Answer
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Adequate Floor Area: The attic must have sufficient floor area, ideally at least 50% of the total floor area for the bedroom. The minimum ceiling height should be around 2.4 meters to provide adequate space and comfort for occupants.
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Ventilation and Natural Light: Incorporating roof lights or dormer windows is essential to allow for natural light. Permanent ventilation must also be included to ensure air quality, adhering to building regulations.
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Fire Safety: The construction of the attic must include fire-grade plasterboard for walls and ceilings, along with proper escape routes and smoke detection systems. The materials used should be fire-resistant, and electrical installations should comply with relevant safety standards.
Step 2
Show the typical design detailing for such a roof. Include the stud side walls and the insulation.
Answer
The traditional cut roof design includes:
- Roof Structure: Roof purlins typically measure 200 mm x 75 mm and are spaced 400 mm apart.
- Insulation: Use 600 mm of insulation between the roof rafters, with options like mineral wool or similar materials.
- Stud Side Walls: Typically, wall studs should be sized at 200 mm x 40 mm, with a height of 2.4 m above the floor. The insulation should also be applied here to maintain energy efficiency.
- Overall Dimensions: The run of the roof is maintained at a ratio allowing a slope of 45°. This ensures stability and adequate drainage.
Step 3
Show clearly the design detailing necessary to ensure the structural stability of the roof.
Answer
The design detailing should include:
- Ridge Board: A ridge board with dimensions of 150 mm x 50 mm connects the top of the roof sections for added stability.
- Counter Battens: These should be placed at 50 mm x 35 mm on the insulation layer to prevent wind penetration and manage moisture.
- Bracing: Diagonal bracing at key points minimizes structural sway and enhances stability, particularly under wind stress.
- Load Transfer: Ensure that the load from structural elements is effectively transferred to the walls. This includes proper fixing of collar ties and securing at common rafter intersections.
Step 4
Show one design detail to prevent air leakage at the junction of the stud side wall and the sloped ceiling.
Answer
At the junction of the stud side wall and the sloped ceiling, it is crucial to implement a continuous air barrier system.
- Installation of Air Barrier: Utilize a polyethylene membrane taped at all joints to ensure airtightness.
- Overlap Design: The barrier should overlap with the ceiling insulation to prevent cold air ingress.
- Adhesive Tape: Apply special adhesive tape around the joint to minimize any potential air leakage. This detail improves energy efficiency and comfort within the attic space.