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The sketch shows a portion of the external wall and the first floor of a two storey dwelling house - Leaving Cert Construction Studies - Question 1 - 2014
Question 1
The sketch shows a portion of the external wall and the first floor of a two storey dwelling house. The external wall is a 350 mm concrete block wall. The cavity is... show full transcript
Worked Solution & Example Answer:The sketch shows a portion of the external wall and the first floor of a two storey dwelling house - Leaving Cert Construction Studies - Question 1 - 2014
Step 1
To a scale of 1:5, draw a vertical section through the external wall and the first floor.
Answer
Begin by sketching the vertical section with appropriate measurements. The section will show the:
- External Wall: Display a 350 mm concrete block wall, ensuring the dimensions are accurate.
- Cavity: Indicate the cavity filled with blown polystyrene beads within the block wall.
- First Floor: Illustrate the floating tongued and grooved hardwood floor supported on 20 mm plywood, resting on 225 mm x 40 mm joists.
- Plasterboard Ceiling: Position the plasterboard ceiling underneath the joists.
- Dimensions: Include four typical dimensions, referencing 300 mm below the plasterboard ceiling and 400 mm above the finished floor, clearly showing a total width of 1.0 metre on your drawing.
- Annotation: Label each component accurately for clarity.
Step 2
On your drawing show one method to prevent the floor joists from twisting.
Answer
To prevent the floor joists from twisting, incorporate a method such as:
- Herringbone Bridging: Use 50 mm x 40 mm pieces, either typical or proprietary metal bridging, placed between joists at regular intervals. This helps to stabilize the joists and reduce the chances of twisting. Ensure that bridging is securely attached to each joist.
- Solid Bridging: Utilize solid bridging of 225 mm x 40 mm, which serves as a typical method for providing additional support.