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Energy Advisor > Foundation Level Exam Part 2 > Flashcards

Foundation Level Exam Part 2 Flashcards

1
Q

What is the criteria for air flow in the home?

A

difference in air pressure between two different locations

ie. inside and outside
upstairs and downstairs

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2
Q

What causes air flow in a home?

A

Wind
Temperature difference creating stack effect
Mechanically induced pressure difference

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3
Q

Identify causes of Air flow through the building envelope

A

Wind Effect: pressure gradient high to low
Stack Effect
Combustion and Ventilation effect: fans, etc.

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4
Q

Factors affecting airflow

A

Pressure difference
Size of opening
Resistence to air movement

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5
Q

Explain Stack Effect

A
  1. Less dense warm air rises and expands, creating higher pressure area near top of the house
  2. Air escapes through holes in ceiling and cracks in walls and around upper storey windows
  3. Force of rising air creates negative pressure at low level and positive pressure at high pressure
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6
Q

Describe Neutral pressure plane

A

Point of equivalent pressure to outdoors.

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7
Q

Describe relationship between wind effect and building envelope.

A
  1. natural ventilation
  2. Will offset neutral pressure plane (NPP)
  3. wind blown over and around a building contributes to pressure gradient across building envelope
  4. Creates positive pressure on windward and negative pressure on leeward side
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8
Q

Relationship between mechanical effect and building envelope?

A
  1. Causes pressure difference that results in air leakage.
  2. Air is drawn out of the house through chimney via some kinds of heating equipment
  3. Chimney creates negative pressure within the house, where outside air drawn through holes in envelope.
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9
Q

Describe reverse stack effect.

A
  1. Occurs when air is drawn in at high level and exhausts at low level
  2. Cooler inside than outside (summer)
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10
Q

Does air leakage or vapour diffusion carry more moisture?

A

air leakage carries 100 times more moisture

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11
Q

Describe air stratification

A

Different temperatures at different elevations in the home

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12
Q

Identify different types of mechanical systems for the home.

A
  1. Principle heating system
  2. Principle cooling system
  3. Humidifier
  4. Forced air heating and or cooling system
  5. Dedicated ventilation
  6. forced air systems with ventilation added
  7. Non-forced air system without dedicated ventilation
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13
Q

What effects do different types of mechanical systems have on heat, air and moisture movement?

A
  1. Principle heating system: addition of heat
  2. Principle cooling system: removal of heat and humidity
  3. Humidifier - addition of humidity
  4. Forced air heating and or cooling system - increase air movement (possible drafts)
  5. Dedicated ventilation - high ventiliation can improve humidity, and moretemp balance
  6. forced air systems with ventilation added - can improve humidity levels and temp balance
  7. Non-forced air system without dedicated ventilation - temperature stratification
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14
Q

What is the function of an air barrier?

A

Most important component of the house envelope: control moisture movement, draft and infiltration of outdoor contaminants. When located inside, air barriers block the entry of most air pollutants emitted from building materials. When outside, limit need for air sealing around service penetrations and can be tested before significant completion.

  1. Low air leakage rate
  2. Continuous over entire envelope
  3. Located anywhere in the assembly
  4. reduces heatind and cooling loads
  5. reduces noise penetration
  6. eliminates drafts
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15
Q

What is the function of the Vapour barrier?

A
  1. Slows diffusion and interior water vapour
  2. Helps prevent condensation of water vapour on cold surfaces
  3. protection moisture damage to structure and insulation
  4. Does not need to be continuous
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16
Q

What is the function of weather/sheathing barrier?

A
  1. Shields wall components from the weather

2. Helps block wind passing into and out of wall cavity (wind washing)

17
Q

What is the function of the thermal barrier?

A
  1. insulating materials

2. slows heat loss

18
Q

What is the functin of the basement and foundation moisture barriers?

A
  1. Damp proofing on exterior of foundation walls located below grade.
  2. Damp proofing on below-grade portion of interior foundation walls where wood framing or batt insulation is in contact with concrete
  3. Bitumen coating prevents water in soil from penetrating concrete walls
19
Q

What materials comprise air barrier assembly?

A
  1. a) Membrane (polyethylene)
    b) rigid (drywall, wood panel sheathing, extruded polystyrene, foil-faced polyurethane and polyisocyanurate board
    stock)
  2. Gasket materials: open/closed-cell polyethylene, butyl glazing tapes, neoprene, polymer-type gaskets
  3. Caulking/sealing: oil/resin-based, latex-based, butyl rubber, nitrile rubber, neoprene rubber, silicone, polysulfide,
    polyurethane, acoustical, siliconized-acrylic
  4. Weather stripping
  5. Specialty (urethane foam, sheathing tape)

Important: appropriate air barrier material must have tested leakage result of 0.02 L (s*m2) or less, measured at an air pressure difference of 75 Pa

20
Q

What materials comprise vapour barrier assembly?

A
  1. polyethylene sheeting
  2. Vapour retarding paints

Important: must resist flow of water vapour from the interior, with a water vapour permeance level less that 60 ng/(Pasm2)
Also, must be located on warm side of insulation (sometimes part of the insulation ro air barrier )

21
Q

What materials comprise moisture barrier (foundation)?

A
  1. Paint of spray derived asphalt emulsions
  2. Sheet material (house wrap, building paper)
  3. Specialty designed foundation membranes
22
Q

What materials comprise a weather/wind barrier?

A
  1. Spunbonded polyolefin and woven polypropylene
  2. Building papers
  3. Liquid applied weather resistive barriers
23
Q

What materials comprise thermal barriers?

A
  1. Insulation (fiberglass, cellulose, foam insulation)

2. EPS/XPS

24
Q

Identify the appropriate location of various barrier systems within building envelope.

A

Air barrier can be located anywhere within the assembly, and it must be continuous.
Vapour barrier must be located on the warm side of the insulation.

25
Q

List major safety protocols for ladder use.

A
  1. slope no less than 25%
  2. Place ladder feet 1/4 of the climb height - the base of the ladder should be out 0.3 m (1 ft) structure. So for every 1.2 m of height, the base of the ladder should be out 0.3 m (1 ft)
  3. Extension: 1 m above the roof
  4. Weight: According to the ladder category

Energy Advisor (11 decks)

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