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ICA > ICA Module 2 Section 4 Venting/Insulation > Flashcards

ICA Module 2 Section 4 Venting/Insulation Flashcards

1
Q

The primary function of insulation is to ____

A

slow rate of heat loss in house

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2
Q

A vapor retarder is designed to _____

A

restrict movement of water vapor

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3
Q

What are the implications of an inadequate air/vapor barrier?

A

mold, rot

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4
Q

Name 2 purposes of house ventilation:

A

remove moisture, keep air fresh from pollutants

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5
Q

Define relative humidity

A

the amount of moisture in the air relative to the amount of moisture air could hold if saturated

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6
Q

What is meant by drying potential?

A

how good air flow (ventilation) is to dry out

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7
Q

Why are roofs vented in the winter in cold climates?

A

keep moisture out, prevent ice dams

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8
Q

What is the purpose of a heat-recovery ventilator?

A

extract stale, moist air from wet rooms & supply fresh, filtered air

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9
Q

The term ventilation might mean two very different things with respect to homes. Explain the two different types of ventilation.

A

living spaces, unconditioned spaces

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10
Q

Indicate where the air/vapor barrier should be located in the wall assembly in a hot, humid climate.

A

warms state

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11
Q

List 4 common forms that insulation materials may be found in.

A

loose fill, bat, board, foamed in place

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12
Q

List 10 common insulation materials. (Vermiculite & perlite only count as 1. There are 2 types of polystyrene)

A

fiberglass, cellulose fiber, mineral wool, perlite, expanded polystyrene, extruded polystyrene

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13
Q

What forms do these materials come in?

A

?

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13
Q

What is the function of an air barrier?

A

stop air movement

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14
Q

Indicate 2 reasons we are interested in controlling air movement through building walls & roofs.

A

air carriers, heat & moisture

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15
Q

Describe the function of a vapor barrier.

A

protect house from moisture damage

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16
Q

List 2 other names for vapor barriers

A

vapor retarder, vapor diffusion retarder

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17
Q

Is it more important for the air barrier or the vapor barrier to be continuous?

A

air barrier

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18
Q

Should the vapor barrier be on the warm side or cold side of the wall assembly?

A

warm side

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19
Q

Should the vapor barrier be on the warm side or cold side of the wall assembly in a hot, humid climate?

A

warm side

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20
Q

List 3 functions of roof vents

A

remove moisture, replace stale air,

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21
Q

List 4 types of roof vents

A

soffit, ridge, roof, gable

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22
Q

What % of the total venting should be at the soffits?

A

50%

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23
Q

What % of the total venting should be high on the roof?

A

50%

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24
Q

When can soffit venting be omitted safely?

A

when there are gable vents at each end of attic

25
Q

What do soffit vent baffles do?

A

prevent insulation from blocking soffit vent

26
Q

How are mansard or gambrel roofs ideally vented?

A

ridge & bottom of upper section

27
Q

Is it possible to over ventilate an attic? If so, why is this an issue?

A

yes, it draws warm/moist air from living space

28
Q

What things should you wear when inspecting an attic? (3 things)

A

mask, goggles, gloves

29
Q

List 3 things that may make attics dangerous.

A

insulation covering joists, weak stair, poor lighting

30
Q

What are the implications of insulation that is only 2” thick, wet, compressed, interrupted by gaps or voids, or missing?

A

screwed shut, nailed shut, painted shut,

31
Q

List 4 common access hatch problems & the implications of each.

A

poorly insulated

32
Q

Will you ever see walls in attics? Where? Should these be insulated?

A

yes, towards bottom of roof (knee wall), yes

32
Q

Under what circumstances should insulation cover recessed lights? What is one inspection strategy to help identify recessed lights while in the attic?

A

double shell lights, look for shells on joists

33
Q

What 2 things should you be looking for on ducts in attic?

A

disconnected, missing

34
Q

How should insulation be handled around masonry chimneys?

A

non-combustible

35
Q

How should insulation be handled around metal vents?

A

kept away

36
Q

What are the implications of air/vapor barriers that are missing or incomplete?

A

air leakage causing condensation causing rot

37
Q

List some common problems with roof vents & their implications

A

missing or inadequate moisture

38
Q

What is suggested by snow on attic insulation below roof vents?

A

damaged vent

39
Q

List 3 possible concerns with turbine vents

A

noisy, seized up, not venting on calm days (no wind)

40
Q

Should power vents be operating in the winter? Why or why not?

A

no, they can increase heat less from house

41
Q

What is suggested by mold or rot on rafters & sheathing?

A

poor ventilation/insulation

42
Q

Describe in 1 sentence each, four general approaches to insulating flat & cathedral roofs.

A

treat as an attic (ventilate above insulation), completely fill roof space, isolate above roof structure & around perimeter, insulate below roof structure

43
Q

List 5 common problems found with flat-roof insulation systems

A

air/vapor barrier missing, bad venting, mold, not enough insulation

44
Q

For each of the problems found in flat roof insulation systems describe in 1 sentence the implications.

A

implications for air vapor barrier missing: mold/rot

45
Q

Describe one possible way to get a look at insulation in a flat roof

A

vents in fascia boards

46
Q

What things might suggest wet insulation?

A

staining, sponginess, or dampness on ceiling below

47
Q

Describe 2 strategies used to deal with venting of flat roofs

A

??

48
Q

On a flat roof, where will you most often see the vents?

A

soffit

49
Q

What is an appropriate ratio of vent area to roof area?

A

1:150 (1 sqft venting every 150 sqft roof space)

50
Q

Basement wall insulation is necessary. T/F

A

False

51
Q

Describe in 2 sentences each, 2 strategies for insulating basement walls.

A

help with utility bill, keep moisture low

52
Q

Describe in one sentence each, two general approaches to insulating crawlspace.

A

insulate walls, insulate floor above

53
Q

All crawlspaces should be vented. T/F (Explain)

A

false, encapsulated doesn’t need vents

54
Q

List 3 safety issues involved in inspecting crawlspaces.

A

stagnant water, animals, hatch less than 18” from bottom to top

55
Q

List 9 common problems with insulation & ventilation in basement & crawlspace areas.

A

little, missing, loose

56
Q

List the implications of each of the problems with insulation/ventilation in crawlspace & basements

A

implications for insulation/ventilation problems: moisture & rot

57
Q

Describe 2 possible strategies for keeping floors over unheated spaces warm.

A

heat cavity between floor & insulation below, spray in place foam insulation

58
Q

List 7 areas where floors over unheated spaces may feel cool.

A

above garage, above porch, cantilevered areas, over breezeways

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