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A new house with an internal width of 7.0 metres, has a traditional cut roof which is slated and has a pitch of 45 degrees, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 7 - 2008
Question 7
A new house with an internal width of 7.0 metres, has a traditional cut roof which is slated and has a pitch of 45 degrees, as shown in the accompanying sketch. The ... show full transcript
Worked Solution & Example Answer:A new house with an internal width of 7.0 metres, has a traditional cut roof which is slated and has a pitch of 45 degrees, as shown in the accompanying sketch - Leaving Cert Construction Studies - Question 7 - 2008
Step 1
To a scale of 1:10 draw a vertical section through one half of the roof structure from eaves to ridge, showing one external wall and one rafter length.
Answer
Begin by establishing the drawing scale of 1:10. Start with the vertical section showing the half of the roof structure, including a detailed external wall and an external rafter. The wall should be depicted using appropriate symbols for timber frame and concrete block construction. Ensure that the slope of the roof at 45 degrees is accurately represented.
Next, indicate the floor joists located 400 mm below the ridge. Detail the three courses of slate at the eaves, ensuring you depict the slate's alignment and overlap clearly. Include typical dimensions, such as the overall height from the eaves to the ridge, the width of the structure (7.0 m), and the thickness of the wall, standard dimensions for each feature to enhance clarity. Use construction notations for additional details as necessary.
Step 2
Indicate clearly on the drawing the design detailing to show the continuity of insulation from the wall to the roof structure.
Answer
On the same drawing, show the insulation layer between the wall and the roof structure. Depict this layer extending seamlessly from the wall up to the rafter, ensuring that it is clear where the insulation begins and ends. Use hatching to denote the insulation material, with labels to specify the type of insulation chosen (e.g., rigid board, spray foam).
Illustrate how the insulation fits into the assembly without gaps, emphasizing any necessary seals at the joints between the wall and roof. Add arrows or notes to reinforce the importance of maintaining continuity in the insulation to prevent thermal bridging.