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The sketch shows a garden wall 1.5 metres in height above the adjoining concrete footpath - Leaving Cert Construction Studies - Question 4 - 2007
Question 4
The sketch shows a garden wall 1.5 metres in height above the adjoining concrete footpath. The wall is a 225 mm solid concrete block wall and the footpath is 1.2 met... show full transcript
Worked Solution & Example Answer:The sketch shows a garden wall 1.5 metres in height above the adjoining concrete footpath - Leaving Cert Construction Studies - Question 4 - 2007
Step 1
To a scale of 1:10, draw a vertical section through the wall and footpath.
Answer
- Start by establishing a base line for your drawing. This represents the ground level.
- Draw the vertical section of the wall height of 1.5 metres. Make sure to represent the 225 mm concrete block dimensions accurately.
- Add the details for the concrete footpath which is 1.2 metres wide, ensuring it is aligned with the wall.
- Include the foundation details at the bottom of the wall and the capping at the top. Ensure the capping is labeled as a precast concrete capping.
- Use appropriate scaling to maintain the 1:10 ratio, ensuring accuracy in all dimensions.
Step 2
Using notes and neat freehand sketches, show how the wall is built both plumb and straight.
Answer
- Building Plumb: Begin by explaining that walls should be built by first laying two or more rows of blocks at both ends. The builder must ensure that the blocks are kept plumb using a spirit level during construction.
- Provide a sketch showing the use of a spirit level and how it is held upright against the wall to check verticality.
- Building Straight: Indicate the use of a builder's line or string stretched between the ends of the wall for alignment. A middle block is laid to ensure it lines up with the string. Mention that precautions are taken to avoid touching or moving the line.
- Illustrate how adjustments can be made by checking the straightness of the wall against the builder's line at various points.