Question 1

The primary function of insulation is to__

Accepted Answer

control heat loss

Question 2

A vapor retarder is designed to__

Accepted Answer

restrict vapor diffusion

Question 3

What are the implications of an inadequate air/vapor barrier

Accepted Answer

moisture may get into the building structure, causing damage

Question 4

Name 2 purposes of house ventilation

Accepted Answer

1. flushes moisture from unconditioned spaces in winter & heat from these spaces in summer 2. provides fresh air for building occupants

Question 5

Relative humidity

Accepted Answer

the amount of moisture in the air relative to the amount it could hold if saturated, expressed as a percent

Question 6

drying potential

Accepted Answer

ability of a material or assembly to dry out after it has gotten wet

Question 7

Why are roofs vented in the winter in cold climates?

Accepted Answer

We were not able to completely to stop air leakage into cool roof spaces, so we need to get rid of that warm, moist air.

Question 8

Purpose of a heat recovery ventilator:

Accepted Answer

To transfer some of the heat from the air exhausted from the house into the fresh air coming into the house

Question 9

Term ventilation might mean 2 very different things with respect to homes. 2 different types of ventilation:

Accepted Answer

1. venting of roof & wall spaces to flush warm moist air out of the building components 2. exhausting stale air & supplying fresh air to the living spaces

Question 10

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

Accepted Answer

outer part of wall, or not at all

Question 11

4 common forms that insulation materials may be found in:

Accepted Answer

1. loose fill 2. batts or blankets 3. rigid boards 4. foamed-in-place

Question 12

10 common insulation materials:

Accepted Answer

1. fiberglass 6. extruded polystyrene 2. cellulose fiber 7. closed cell phenolic plastic 3. mineral wool 8. polyisocyanurate 4. vermiculite/perlite 9. polyurethane 5. expanded polystyrene 10. isocyanate/polyisocyanate

Question 13

What forms do insulation materials come in?

Accepted Answer

loose, fill, batt, board loose fill board foamed in place

Question 14

Function of an air barrier:

Accepted Answer

to stop air movement through building walls/roofs

Question 15

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

Accepted Answer

1. minimize heat flow to exterior/interior 2. minimize moisture flow to building components

Question 16

Describe the function of a vapor barrier

Accepted Answer

protect building from moisture damage. designed to protect from moisture due to vapor diffusion, not air movement

Question 17

2 other names for vapor barriers:

Accepted Answer

vapor retarder, vapor diffusion retarder

Question 18

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

Accepted Answer

air barrier

Question 19

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

Accepted Answer

warm side

Question 20

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

Accepted Answer

warm side

Question 21

3 functions of roof vents:

Accepted Answer

1. allow warm, moist air out of attic 2. reduce attic temps in summer 3. helps prevent ice dams in winter by keeping attic cold

Question 22

4 types of roof vents:

Accepted Answer

1. soffit 2. ridge 3. roof 4. gable

Question 23

Percentage of total venting should be at soffits?

Accepted Answer

50%

Question 24

Percentage of total venting should be high on roof?

Accepted Answer

50%

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Module 2 Section 2 Insulation/Ventilation Study Cards Flashcards

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