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

For this part of the question, implement best-practice design detailing as follows:

1. Airtight Membrane: Ensure that a breather membrane is properly sealed and taped at the junction. This membrane acts as an air barrier, minimizing air leakage. Clearly illustrate where it is integrated within the assembly.

2. Air Sealing Materials: Use airtightness tape at the junction between the external wall and the first floor. Mark this detail on your drawing, highlighting its placement along the walls and floor.

3. Attention to Joist Connections: Seal any connections where the wooden joists meet the wall. This should also include appropriately attached insulation materials like PIR or similar high-density insulation. Show how these details work together to create a continuous air barrier.

4. Draft-Proofing Elements: Indicate the use of a double rebated door for effective draft-proofing at the door junction. Label the components of the door assembly, emphasizing the vertical sheeting and doorframe which are crucial for maintaining airtightness.

5. Final Detail Check: Review your drawing to ensure all elements promoting airtightness are included in a coherent manner, enhancing the overall environmental performance of the structure.