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The sketch shows a tiled roof of a dwelling house, which is supported on a 300 mm external concrete block wall with an insulated cavity - Leaving Cert Construction Studies - Question 1 - 2008
Question 1
The sketch shows a tiled roof of a dwelling house, which is supported on a 300 mm external concrete block wall with an insulated cavity. The roof has a pitch of 30° ... show full transcript
Worked Solution & Example Answer:The sketch shows a tiled roof of a dwelling house, which is supported on a 300 mm external concrete block wall with an insulated cavity - Leaving Cert Construction Studies - Question 1 - 2008
Step 1
To a scale of 1:5, draw a vertical section through the eaves of the tiled roof and the external wall.
Answer
To begin, set up your drawing tools to a scale of 1:5. Start by sketching a vertical section of the tiled roof and the external wall. Include the following details:
- Roof Tiles: Depict the concrete tiles arranged over the softwood battens that are 44 x 35 mm.
- Rafters: Draw the rafters measuring 150 x 50 mm, ensuring proper alignment and spacing as per building regulations.
- Wall Details: Include the concrete block inner leaf (100 mm), a 15 mm internal plasterboard, and the wall plate that connects the roof and wall.
- Insulation: Draw the insulation layer that complies with current building regulations.
- Cavity: Show the insulated cavity of 40 mm.
- Eaves: Demonstrate the overhang of the eaves with the necessary detailing.
- Ceiling and Finish: Indicate the ceiling at 150 x 50 mm and the plasterboard finish below.
- Three Courses of Tiles: Make sure three complete courses of the tiles are visible in the section to illustrate the roofing detail.
Step 2
On your drawing, show a method of providing ventilation to the roof members.
Answer
For adequate ventilation of the roof members, incorporate the following elements in your drawing:
- Soffit Vents: Include vents in the soffit to allow fresh air into the roof space.
- Proprietary Vents: Show proprietary ventilation devices placed near the eaves, particularly where soffit ventilation is not feasible.
- Cross Ventilation: Ensure that air can circulate effectively within the roof members to prevent moisture buildup and promote airflow.