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The eaves of a timber flat roof for a bathroom is constructed as shown in the sketch - Leaving Cert Construction Studies - Question 1 - 2013
Question 1
The eaves of a timber flat roof for a bathroom is constructed as shown in the sketch. The roof is covered with layers of bituminous felt on plywood decking on 200 mm... show full transcript
Worked Solution & Example Answer:The eaves of a timber flat roof for a bathroom is constructed as shown in the sketch - Leaving Cert Construction Studies - Question 1 - 2013
Step 1
To a scale of 1:5, draw a vertical section through the eaves of the flat roof and through the external wall.
Answer
To accurately represent the construction in a vertical section at a scale of 1:5, follow these guidelines:
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Drawing the Eaves Section: Begin by sketching the eaves of the flat roof. Include three layers of bituminous felt, a plywood decking of 18-25 mm thickness, and specify the 200 mm x 50 mm roof joists.
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Insulation Layer: Indicate the 150 mm roof insulation in compliance with current Building Regulations beneath the roof joists. This should be followed by the plasterboard ceiling denoted by 12.5 mm insulation.
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External Wall Construction: Draw the 350 mm concrete block wall, showcasing the insulated cavity of 50 mm. Ensure to detail the wallplate (100 mm x 75 mm) and its connection to the blockwork via wallplate straps.
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Fascia and Soffit Details: Include the soffit (12 mm) and the fascia (25 mm), ensuring all dimensions are noted. Measurements such as the length of the roof joist (1.5 m) should be visible.
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Dimensions: Clearly label the four typical dimensions in the section for clarity, ensuring they are proportional to the 1:5 scale.
Carefully label each component, ensuring that the section is both detailed and to scale for full comprehension.
Step 2
On your drawing, show how rainwater is removed from the flat roof.
Answer
In the vertical section drawing, detail the rainwater drainage system as follows:
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Drip Edge: Show a drip edge formed with 50 mm x 25 mm battens attached to the fascia, directing water away from the roof edge.
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Guttering: Illustrate the eaves gutter positioned underneath the drip edge to collect water from the roof surface.
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Downpipe Connection: Indicate how the rainwater is piped down from the gutter using a downpipe going down the wall, conveying rainwater to the ground level.
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Slope: Ensure the flat roof is shown with a suitable slope towards the gutter to promote efficient drainage.
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Annotations: Label the elements clearly in the drawing to enhance understanding of how the rainwater management system functions. Make sure to follow standard construction practices adhering to current Building Regulations.