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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
(a) To a scale of 1:5, draw a vertical section through a portion of the external wall, doorframe, door, first floor joists, and floor.
Answer
To create the vertical section at a 1:5 scale:
- Start with the external wall: Begin by sketching the 450 mm concrete block wall, detailing its insulation cavity.
- Draw the doorframe: Indicate the thermally broken frame, ensuring to show how it fits within the wall.
- Illustrate the door: Represent the insulated wooden door with vertical sheeting on both sides.
- Show the first floor structure: Include the 25 mm floating wooden floor, the 20 mm plywood deck underneath, and the 200 mm x 40 mm wooden joists spaced at 400 mm centers.
- Add the plasterboard ceiling beneath: Depict it tightly fitted to the joists to illustrate sound and fireproofing.
- Dimensions: Ensure that all elements are accurately proportioned to the scale of 1:5.
Step 2
(b) Show clearly on your drawing best-practice design detailing to ensure air-tightness at the junction of the external wall and the first floor.
Answer
For the air-tightness detailing at the junction of the external wall and the first floor:
- Breather membrane: Display the breather membrane sealing taped along the junction.
- Air-tightness tape: Indicate the use of air-tightness tape at the junction of the wall and ceiling to prevent air leakage.
- Double rebatment door for draught proofing: Show a double rebatement detail for the door strip.
- Continuity: Ensure that insulation materials are continuous to maintain air-tightness. Highlight the use of PIR or similar high-density insulation in the cavity.
- Sealants: Mention the application of sealants around the edges to secure air-tightness.