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The main entrance door to a two-storey dwelling house is a high performance insulated wooden door, with vertical sheeting on both sides - Leaving Cert Construction Studies - Question 7 - 2018
Question 7
The main entrance door to a two-storey dwelling house is a high performance insulated wooden door, with vertical sheeting on both sides. The doorframe is thermally b... show full transcript
Worked Solution & Example Answer:The main entrance door to a two-storey dwelling house is a high performance insulated wooden door, with vertical sheeting on both sides - Leaving Cert Construction Studies - Question 7 - 2018
Step 1
Draw a vertical section through a portion of the external wall, doorframe, door, first floor joists, and floor
Answer
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Begin by drawing the outline of the external wall, ensuring to incorporate the 450 mm concrete block wall as the base structure.
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Add the doorframe, depicting the thermally broken frame and the vertical sheeting on both sides of the door.
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Detail the door itself, showing any additional mechanisms or insulation present.
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Illustrate the wooden joists, using 200 mm x 40 mm dimensions at 400 mm centers, supporting the 25 mm floating wooden floor.
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Include the 20 mm plywood decking underneath the floating floor and the plasterboard ceiling beneath the joists.
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Mark dimensions accurately to a scale of 1:5 for all components, ensuring clarity in the construction details from the specified levels.
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Indicate the level 400 mm below the door top and the level 300 mm above the first floor joists to highlight the section range.
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Ensure all components are labelled clearly within the diagram.
Step 2
Show clearly on your drawing best-practice design detailing to ensure airtightness at the junction of the external wall and the first floor.
Answer
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Use airtightness tape at the junction where the external wall meets the floor joists to create a seal.
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Incorporate a breather membrane that is sealed and taped around the joist area to prevent air leakage.
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Ensure the insulation within the cavity is well fitted and continuous around the junction.
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Show double rebatded door for draught proofing measures at the door location.
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Highlight the use of a continuous draught strip along the edges of the door for enhanced airtightness.
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Label all components that contribute to the airtightness design detailing to clarify their function in the structure.