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Y2: Carpenter Theory > 201d: Building Envelope > Flashcards

201d: Building Envelope Flashcards

1
Q

Exterior weather
Air movement
Vapour (moisture)
Temperature

A

4 functions of the building envelope

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2
Q

Controlling moisture so it doesn’t break down insulation or absorb into the building

A

Air barrier such as poly film

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3
Q

Transfer heat at exterior in a controlled manner

A

Insulation’s purpose

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4
Q

Why is poly on the inside of a building?

A

MOIST air from heat inside can’t penetrate outwards and into the structure

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5
Q

What part of the envelope is a roof covering?

A

Weather resistance

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6
Q

What does siding and building paper work together to accomplish?

A

Repel water and keep it out of building structure from EXTERIOR sources

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7
Q

Downfall of mass wall

A

Cracks can cause building envelope failure via water pentration

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8
Q

Exterior cladding
Drainage cavity (air space)
Internal drainage plane (house wrap)

A

Rainscreen wall design

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9
Q

How do foundation walls repel water?

A

Damp proofing; helps wick and drain water down to weeping tile

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10
Q

Why do we install rigid insulation on the outside of foundation walls?

A

Insulation

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11
Q

Why do we install rigid insulation under concrete slabs sometimes?

A

Insulation from ground below a slab

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12
Q

Heat—>solids

A

Conduction

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13
Q

Heat—>air

A

Convection (oven)

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14
Q

Heat from a heat source

A

Radiation (fireplace)

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15
Q

Heat loss through walls

A

Conduction

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16
Q

Heat loss through ceiling FRAMING

A

Conduction

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17
Q

Heat loss prevention in ceiling

A

Blow in insulation MUST cover ceiling framing members

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18
Q

Heat loss through floor

A

Conduction

19
Q

Heat loss through GAPS or CRACKS in framing and concrete

A

Convection (air)

20
Q

Heat loss through foundation or slabs

A

Conduction

21
Q

Insulated doors and windows

A

Prevent conductive heat loss through openings

22
Q

Prevent conductive heat loss through foundation walls

A

Rigid insulation
Frost walls

23
Q

Batt
Loose fill
Rigid
Semi rigid
Polyurethane foam

A

Insulation types

24
Q

Whats an R value?

A

Measurement of thermal resistance of insulating materials?

25
Q

Typical wall insulation

A

Batt

26
Q

Typical roof/ceiling insulation

A

Loose fill

27
Q

Bad place for expanded polystyrene…

A

Anywhere moisture light be involved

28
Q

Typical spray foam

A

Polyurethane foam

29
Q

Typical use for spray poly foam

A

Doors and window jambs and trimmers

30
Q

Sound absorbing material
Increase wall mass
Break sound path

A

Increase sound absorption

31
Q

Double drywall layers, air gaps, high R value insulation, staggered studs

A

Ways to increase wall mass

32
Q

Why use a resilient metal channel?

A

Drywall not in direct contact with studs = less sound vibration transfer

33
Q

Double wall and staggered studs

A

Break sound path of vibration

34
Q

Warm air can…

A

Hold more MOISTURE than cold air

35
Q

How is an air barrier effective?

A

Limits air movement between interior and exterior THROUGH the walls and ceiling

36
Q

Can OSB be an air barrier?

A

Yeah but the edges have to be sealed

37
Q

Are vapour barriers put on the exterior?

A

No. Typically put on the warm side of the building.

38
Q

Prevent moist air from inside passing through the walls and condensing at the dew point I. The colder exterior wall system

A

Vapour barrier

39
Q

How do we vent gables since it’s such a large space compared to a hip?

A

Gable end vent

40
Q

Whats typically used to vent attics?

A

Roof vents

41
Q

How do we vent crawl spaces?

A

Venta in opposing ends of building

42
Q

How can we increase the available space for insulating the ceiling and attic?

A

Higher heels on trusses allows for thicker loose fill insulation

43
Q

If a floor is cantilevered to the outside, do we need something in it?

A

Need insulation in the floor where it extends past the foundation and “floats” in the air

Y2: Carpenter Theory (10 decks)

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