201d: Building Envelope

Question 1

Exterior weather
Air movement
Vapour (moisture)
Temperature

Answer 1

4 functions of the building envelope

Question 2

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

Answer 2

Air barrier such as poly film

Question 3

Transfer heat at exterior in a controlled manner

Answer 3

Insulation’s purpose

Question 4

Why is poly on the inside of a building?

Answer 4

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

Question 5

What part of the envelope is a roof covering?

Answer 5

Weather resistance

Question 6

What does siding and building paper work together to accomplish?

Answer 6

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

Question 7

Downfall of mass wall

Answer 7

Cracks can cause building envelope failure via water pentration

Question 8

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

Answer 8

Rainscreen wall design

Question 9

How do foundation walls repel water?

Answer 9

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

Question 10

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

Answer 10

Insulation

Question 11

Why do we install rigid insulation under concrete slabs sometimes?

Answer 11

Insulation from ground below a slab

Question 12

Heat—>solids

Answer 12

Conduction

Question 13

Heat—>air

Answer 13

Convection (oven)

Question 14

Heat from a heat source

Answer 14

Radiation (fireplace)

Question 15

Heat loss through walls

Answer 15

Conduction

Question 16

Heat loss through ceiling FRAMING

Answer 16

Conduction

Question 17

Heat loss prevention in ceiling

Answer 17

Blow in insulation MUST cover ceiling framing members

Question 18

Heat loss through floor

Answer 18

Conduction

Question 19

Heat loss through GAPS or CRACKS in framing and concrete

Answer 19

Convection (air)

Question 20

Heat loss through foundation or slabs

Answer 20

Conduction

Question 21

Insulated doors and windows

Answer 21

Prevent conductive heat loss through openings

Question 22

Prevent conductive heat loss through foundation walls

Answer 22

Rigid insulation
Frost walls

Question 23

Batt
Loose fill
Rigid
Semi rigid
Polyurethane foam

Answer 23

Insulation types

Question 24

Whats an R value?

Answer 24

Measurement of thermal resistance of insulating materials?

Question 25

Typical wall insulation

Answer 25

Batt

Question 26

Typical roof/ceiling insulation

Answer 26

Loose fill

Question 27

Bad place for expanded polystyrene…

Answer 27

Anywhere moisture light be involved

Question 28

Typical spray foam

Answer 28

Polyurethane foam

Question 29

Typical use for spray poly foam

Answer 29

Doors and window jambs and trimmers

Question 30

Sound absorbing material Increase wall mass Break sound path

Answer 30

Increase sound absorption

Question 31

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

Answer 31

Ways to increase wall mass

Question 32

Why use a resilient metal channel?

Answer 32

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

Question 33

Double wall and staggered studs

Answer 33

Break sound path of vibration

Question 34

Warm air can…

Answer 34

Hold more MOISTURE than cold air

Question 35

How is an air barrier effective?

Answer 35

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

Question 36

Can OSB be an air barrier?

Answer 36

Yeah but the edges have to be sealed

Question 37

Are vapour barriers put on the exterior?

Answer 37

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

Question 38

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

Answer 38

Vapour barrier

Question 39

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

Answer 39

Gable end vent

Question 40

Whats typically used to vent attics?

Answer 40

Roof vents

Question 41

How do we vent crawl spaces?

Answer 41

Venta in opposing ends of building

Question 42

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

Answer 42

Higher heels on trusses allows for thicker loose fill insulation

Question 43

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

Answer 43

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