Photo AI
A dwelling house has a 400 mm concrete block wall with a full-fill insulated cavity supported on a traditional strip foundation - Leaving Cert Construction Studies - Question 1 - 2020
Question 1
A dwelling house has a 400 mm concrete block wall with a full-fill insulated cavity supported on a traditional strip foundation. The wall is plastered on both sides.... show full transcript
Worked Solution & Example Answer:A dwelling house has a 400 mm concrete block wall with a full-fill insulated cavity supported on a traditional strip foundation - Leaving Cert Construction Studies - Question 1 - 2020
Step 1
To a scale of 1:5, draw a vertical section through the strip foundation, external wall and ground floor.
Answer
To create a vertical section:
- Foundation: Start with a reinforced concrete foundation represented at the bottom of the drawing. Include a base or footing for stability.
- Hardcore Layer: Above the foundation, illustrate a 300 mm hardcore layer, which is essential for moisture control.
- Sand Blinding: Add a 50 mm sand blinding layer to prevent moisture ingress.
- Damp Proof Membrane: Depict a radon barrier or damp proof membrane.
- Insulation Layer: Illustrate a rigid floor insulation layer that measures between 200-300 mm.
- Reinforced Concrete Slab: Draw the reinforced concrete slab above the insulation layer.
- Floor Finish: Finish with a 20 mm floor tile layer. Ensure to include four typical dimensions, such as 100 mm for the concrete block inner leaf and 100 mm for the outer leaf.
Label all components clearly according to the specifications provided.
Step 2
On your drawing, show the typical design detailing to prevent dampness entering the building through the floor.
Answer
For damp proofing in your design:
- Damp Proof Membrane (DPM): Place a continuous layer of DPM under the concrete slab. This serves as an impervious barrier preventing moisture from the ground.
- Damp Proof Course (DPC): Illustrate the placement of a DPC in the walls above the slab. This layer stops rising damp from the floor due to capillary action.
Ensure these features are clearly labeled and integrated into your vertical section for effective moisture control.