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A triple-glazed timber easement window, as shown in the sketch, is fixed in a 350 mm external concrete block wall with an insulated cavity - Leaving Cert Construction Studies - Question 5 - 2012
Question 5
A triple-glazed timber easement window, as shown in the sketch, is fixed in a 350 mm external concrete block wall with an insulated cavity. The fixed frame of the wi... show full transcript
Worked Solution & Example Answer:A triple-glazed timber easement window, as shown in the sketch, is fixed in a 350 mm external concrete block wall with an insulated cavity - Leaving Cert Construction Studies - Question 5 - 2012
Step 1
Draw a vertical section through the bottom portion of the window
Answer
Begin by sketching the bottom section of the window at a scale of 1:5. Include the:
- Window board: 25 mm
- Window frame: 150 mm wide and 80 mm deep
- Triple-glazed low-e glass, noting its thickness
- Precast concrete window cill
- D.P.C. (Damp Proof Course)
- External plaster: 15 mm
- Concrete block outer leaf: 100 mm
- Residual cavity thickness: 50 mm
- Wall tie positions
- Thermal insulation layer of 100 mm
- Concrete block inner leaf: 100 mm
- Internal plaster: 15 mm
- Proprietary cavity closer, ensuring connection between the lintel and wall.
Step 2
Include design detailing to prevent thermal/cold bridge
Answer
Incorporate insulation attached to the back side of the concrete cill to effectively prevent cold bridging. You should ensure to show:
- Insulation extending upwards to meet the wall, preventing thermal loss.
- The installation of an insulated cavity closer that helps maintain the thermal integrity of the wall assembly.