Carpentry 2: The Building Envelope
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Name the 3 ways that heat may be transferred.
Heat loss through walls is primarily by which method?
How can heat loss through walls be minimized?
By completely insulating stud cavities and applying rigid insulation to the exterior of the wall.
Why is it important to seal all electrical boxes in insulated ceilings?
Prevent warm air from escaping into the attic
How can convection heat loss through the floor frame be reduced?
Use caulking or a foam sill gasket between the top of the foundation wall and the floor joists to seal any gaps.
By what method is heat lost through concrete foundations?
How can convection heat loss be reduced at doors and windows?
Place insulation between the framing and window or doorjambs; also ensure that weather stripping seals tightly.
What is a desirable characteristic of good insulating materials?
Tiny cells or air spaces to slow down heat loss.
Why is batt insulation referred to as friction fit?
Batts are slightly wider than the stud cavity and held in place by friction.
In residential construction, where is loose fill insulation mainly used?
To insulate horizontal surfaces, such as in the attic
Name the 2 types of polystyrene insulation.
Which type of polystyrene is best suited for below grade use?
What system is used to judge a wall's ability to resist the passage of sound?
Sound Transmission Class (STC) rating
Identify 3 ways to reduce sound transmission through walls.
- 1. Place sound absorbing material within the stud cavity
- 2. Increase the mass of the wall
- 3. Break the path of sound vibration
What is the 'dew point'?
The temperature at which condensation occurs
Definte the term 'air barrier'.
Any material that reduces the amount of warm, moist air in a building migrating outward into the walls and ceilings.
Define the term 'vapour barrier'.
- Any material that reduces the passage of moisture by diffusion.
- Polyethylene is commonly used, but aluminium foil and some types of paint also act as vapour barriers.
What products are commonly used as wall sheathing membranes?
- Black asphalt sheathing paper
- House wraps such as Tyvek and Typar
Attic ventilation can be provided in which three locations?
- 1. Roof vents
- 2. Soffit vents
- 3. Gable end vents
What types of truss is used to allow more insulation in the attic space?
High heel trusses
What would you like to do?
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