This study session covers the materials and characteristics of air/vapor barriers.
The estimated completion time for this study session is sixty minutes.
Objectives
At the end of this study session, you should be able to:
At the end of this study session, you should be able to:
- Describe in one sentence the function of an air barrier.
- Give two reasons it is important to control air movement through building walls and roofs.
- Describe in one sentence the function of a vapor barrier.
- List two other names for vapor barriers.
- List six qualities of a good air barrier.
- List ten building materials that may act as an air barrier.
- List five qualities of a good vapor barrier.
- Indicate whether it is more important for an air barrier or a vapor barrier to be continuous.
- Indicate whether vapor barriers should be on the warm or cold side of walls.
- Define perm in one sentence.
- List seven common building materials that may act as vapor barriers.
- Explain in two sentences why a vapor barrier should be laid on an earth floor in a crawlspace.
Question 1
Define imperial.Selected Answer:
An imperial perm is the number of grains of water that will move through one square foot of material in one hour, under a pressure difference of one inch of mercury. One grain is 0.002285 ounces.Correct Answer: 
Imperial ? the number of grains of water that will move through one square foot of a material per hour under a 1-inch (Mercury) pressure differential.Response Feedback: [None Given] Question 2
Describe the function of a vapour barrier.Selected Answer:
The function of vapor barrier is to protect the wall from moisture damage due to vapor diffusion.Correct Answer:
To protect the building from moisture damage. Designed to protect from moisture due to air movement, not vapour diffusion.Response Feedback: [None Given] Question 3
Indicate two reasons we are interested in controlling air movement through building walls and roofs.Selected Answer:
1. Air carries heat. We want to minimize the flow of building heat to the outdoors.2. Air carries moisture. This moisture may be deposited in the building structure as it cools and condenses. This can cause damage to the building.Correct Answer:
1. Minimize heat flow to exterior/interior 2. Minimize moisture flow to building componentsResponse Feedback: [None Given] Question 4
List at least 10 building materials that may act as an air barrier. (You may come up with 12.)Selected Answer:
1. Polyethylene2. Housewraps3. Foam insulation boards4. Drywall, plaster and wood paneling5. Sheathing6. Building paper7. Sill gaskets8. Gaskets for electrical boxes and plastic enclosures around electrical boxes9. Backer rods10. Caulking and weather stripping11. Polyurethane foams12. Duct tape and duct mastic.Correct Answer:
1. Polyethylene 2. Housewraps 3. Foam insulation boards 4. Drywall, plaster, and wood paneling 5. Sheathing 6. Asphalt impregnated fibreboard 7. Building paper 8. Sill gaskets 9. Gaskets for electrical boxes and plastic enclosures around electrical boxes 10. Backer rods 11. Caulking and weatherstripping 12. Polyurethane foams 13. Duct tape and duct masticResponse Feedback: [None Given] Question 5
List five qualities of a good vapour barrier.Selected Answer:
1. Vapor diffusion resistant2. Durable3. Moisture and rot resistant4. Chemically inert5. InexpensiveCorrect Answer:
1. Retards vapour diffusion 2. Durable 3. Moisture and rot resistant 4. Chemically inert 5. InexpensiveResponse Feedback: [None Given] Question 6
List seven common building materials that may act as vapour barriers.Selected Answer:
1. Polyethylene film2. Kraft paper3. Aluminum foil4. Oil-based paints and vapor-retardant patins5. Insulations6. Vinyl wallpaper7. Plywood and OSB sheathingsCorrect Answer:
1. Polyethylene film 2. Kraft paper 3. Aluminum foil 4. Oil-based paints and vapour retardant paints 5. Insulations 6. Vinyl wallpaper 7. Plywood and OSB sheathingsResponse Feedback: [None Given] Question 7
List six qualities of a good air barrier.Selected Answer:
1. Stop air movement2. Durable, ideally lasting the life of the building3. Strong and either rigid or well enough supported to stay in place4. Continuous. An air barrier that is 99 percent intact can't do its job5. Inexpensive6. Resistant to moisture, rot and chemicalCorrect Answer:
1. Stops air movement 2. Durable 3. Strong, and either rigid or well enough supported to stay in place 4. Continuous 5. Inexpensive 6. Resistant to moisture, rot, and chemicalsResponse Feedback: [None Given] Question 8
List two other names for vapour barriers.Selected Answer:
Vapor retarderVapor diffusion retarderCorrect Answer:
Vapour retarder, vapour diffusion retarder (VDR)Response Feedback: [None Given] Question 9
What is the function of an air barrier?Selected Answer:
To stop air movementCorrect Answer:
To stop air movement through building walls and roofResponse Feedback: [None Given] Question 10
Why would a vapour barrier be laid on an earth crawlspace floor?Selected Answer:
To eliminate gallons of water that could be generated from soil into the house airCorrect Answer:
To keep the moisture in the ground, instead of diffusing into the air and adding to the moisture levels in the crawlspace and houseResponse Feedback: [None Given] Question 11
Should the vapour barrier be on the warm side or cold side of the wall assembly in a hot, humid climate?Selected Answer:
warm sideAnswers:
Response Feedback: Good workQuestion 12
Should the vapour barrier be on the warm side or cold side of the wall assembly?Selected Answer:
warm sideAnswers:
Response Feedback: Good workQuestion 13
Which is more important to be continuous?Selected Answer:
air barrierAnswers:
Response Feedback: Good work
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