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The main external doorway of a dwelling house is designed to facilitate access for everyone, including a person with reduced mobility, as shown in the sketch - Leaving Cert Construction Studies - Question 1 - 2011
Question 1
The main external doorway of a dwelling house is designed to facilitate access for everyone, including a person with reduced mobility, as shown in the sketch. The do... show full transcript
Worked Solution & Example Answer:The main external doorway of a dwelling house is designed to facilitate access for everyone, including a person with reduced mobility, as shown in the sketch - Leaving Cert Construction Studies - Question 1 - 2011
Step 1
To a scale of 1:10, draw a vertical section through the centre of the door.
Answer
To create the vertical section through the center of the door, start by ensuring that the drawing is to scale (1:10). Begin by sketching the following elements:
- Doorframe: Draw the doorframe dimensions of 150 mm x 70 mm, placed vertically.
- Door: Include the framed wooden door, indicating the 12 mm thick vertical sheeting on both sides.
- Threshold: Show the threshold construction starting from 500 mm below the finished floor level and extend through the door.
- Concrete Block Wall: Represent the 350 mm external concrete block wall with an insulated cavity on one side of the frame.
- Floor Details: Illustrate the solid concrete ground floor with a 20 mm quarry tile finish above the threshold.
- Lintels: Finally, include the dimensions that extend to a height of 300 mm above the concrete lintels, ensuring that clear connections between sections are visible.
Step 2
Show on the drawing the design detailing that ensures that rainwater is removed from the threshold area.
Answer
To design the rainwater removal system at the threshold area, follow these steps:
- Drainage Slope: Ensure that the surface of the threshold is sloped away from the door. A gradient of at least 1:40 is recommended to facilitate runoff.
- Gutters and Drains: Include gutters installed around the doorframe, directing rainwater towards external drainage systems.
- Waterproofing: Specify waterproof detailing at the threshold where it meets the wall to prevent water ingress.
- Drip Edge: Add a drip edge at the base of the doorframe to allow water to fall directly to the ground instead of running back into the building.
- Materials: Indicate the materials used, such as sealed concrete or weatherproof membranes, which further prevent moisture buildup.
By incorporating these features into your drawing, you will demonstrate effective rainwater management at the external doorway.