Photo AI
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
Begin by sketching the overall vertical section of the eaves where the tiled roof meets the external wall. Ensure that your drawing is to scale (1:5). Start with the tiled roof, illustrating three courses of concrete tiles. Include details such as:
- Rafters: Draw the rafters measuring 150 mm x 50 mm, ensuring they comply with Building Regulations.
- Insulation: Add roof insulation to meet current Building Regulations. The insulation should be positioned below the roof covering.
- Eaves Detail: Include soffits measuring 12 mm, with a fascia of 25 mm.
- Cavity Wall: Clearly represent the 300 mm external block wall with an insulated cavity, showing the internal wall leaf measuring 100 mm.
- Other Elements: Draw in any plasterboard and ceiling details, ensuring to include the wall plate which is located 400 mm below the wall plate level. All materials and dimensions should be indicated accurately.
Step 2
On your drawing, show a method of providing ventilation to the roof members.
Answer
To provide ventilation to the roof members, illustrate the following:
- Soffit Vents: Draw vents in the soffit to allow air circulation. Note that these vents are essential for reducing moisture build-up and maintaining air flow within the roof space.
- Proprietary Vents: Indicate proprietary vent types that are to be installed near the eaves. This is particularly important where the soffit ventilation might not be sufficient.
- Fixed Installations: Ensure that the ventilation components are shown as fixed between the rafters to demonstrate structural support and longevity of installation.