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A front porch projects 1.2 metres from the external wall of a dwelling house, as shown - Leaving Cert Construction Studies - Question 1 - 2018
Question 1
A front porch projects 1.2 metres from the external wall of a dwelling house, as shown. The insulated roof of the porch is of timber frame construction with a rainsc... show full transcript
Worked Solution & Example Answer:A front porch projects 1.2 metres from the external wall of a dwelling house, as shown - Leaving Cert Construction Studies - Question 1 - 2018
Step 1
(a) Draw a vertical section through the porch showing the external wall of the porch, the sloping roof, and the front wall of the house.
Answer
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Choose the Drawing Scale: Set your drawing to a scale of 1:5 to ensure accurate representation.
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Outline the Porch Structure: Begin by sketching the vertical section of the porch, ensuring to represent the external wall accurately. Identify the distance of 1.2 meters extending from the main house wall.
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Depict the Roof Structure: Draw the sloping roof of the porch with the specified pitch of 30°. Indicate the rafters and their connection to the wall of the house.
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Include Insulation Details: Show the insulated slate roof construction. Clearly illustrate the insulated plasterboard fixed under the rafters.
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Integration of the External Wall: Draw the external wall of the house, ensuring to detail the 400 mm rendered concrete block wall with a full-fill insulated cavity.
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Construction Details Under the Wallplate: Detail the area from 300 mm below the wallplate up to 300 mm above the abutment. Ensure to show typical construction elements like breather membranes and battens as outlined in the marking scheme.
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Slate Courses: Indicate three courses of slate at the eaves to illustrate proper finishing in relation to the wall of the house.
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Final Touches: Clean up the drawing, ensuring that all components are labeled appropriately for clarity.
Step 2
(b) Show the typical design detailing to prevent the ingress of rainwater between the roof of the porch and the front wall of the house.
Answer
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Flashing Design: Incorporate flashing where the porch roof abuts the wall of the house. This should be designed to extend a minimum of 150 mm up the wall and 300 mm onto the roof.
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Vapour Barrier Installation: Ensure to illustrate a vapor barrier under the roof covering to prevent moisture transfer into the wall section.
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Drainage Plan: Include details on sloping the roof towards the eaves to promote effective drainage away from the wall.
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Gutter System: Design a gutter system along the edge of the porch roof to collect and divert rainwater away effectively from the house structure, ensuring the gutter has adequate downspouts.
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Sealants and Weep Holes: Depict the application of sealants at joints and the presence of weep holes in the wall to allow any trapped water to escape.
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Maintenance Access: Consider detailing access points for maintenance to ensure long-term performance of water protection measures.