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The sketch shows portion of a pitched roof including the ridge - Leaving Cert Construction Studies - Question 5 - 2020
Question 5
The sketch shows portion of a pitched roof including the ridge. This traditional slated cut roof has a pitch of 45°. The slates are fixed to 50 mm x 20 mm battens, o... show full transcript
Worked Solution & Example Answer:The sketch shows portion of a pitched roof including the ridge - Leaving Cert Construction Studies - Question 5 - 2020
Step 1
To a scale of 1:5, draw a vertical section through the roof at the ridge.
Answer
Start by sketching the outline of the pitched roof with a 45° angle at the ridge. Begin from the ridge and work downwards.
- Ridge Board: Indicate a 275 mm x 32 mm ridge board at the top of the roof.
- Rafters: Draw 200 mm x 50 mm rafters sloping down from the ridge, ensuring to represent the rafters accurately.
- Collar Ties: Depict collar ties positioned 900 mm below the ridge level at a width of 200 mm x 50 mm, supporting the rafters.
- Slates and Battens: Include 50 mm x 35 mm battens horizontally attached to the rafters. Then, represent the slates attached to the battens, ensuring to show three courses of slates at the ridge.
- Breather Membrane: Indicate a breather membrane beneath the slates.
- Insulation and Plasterboard: Finally, draw insulation between the rafters and an insulated plasterboard ceiling beneath the collar ties, showing the insulation thickness accurately.
Step 2
On your drawing show one method of ventilating the roof.
Answer
To provide ventilation, illustrate a ridge vent installed at the peak of the roof. This vent allows hot air to escape from the space beneath the roof, enhancing airflow and preventing moisture build-up. Additionally, you may include fitting vent slates near the ridge to facilitate cross-ventilation.