Leakage and diffusion of gas (such as air vapor) through a building envelope are two different mechanisms because
a. leakage occurs through holes, cracks, and openings in the envelope, while diffusion occurs through the body of an envelope component or its materials
b. leakage occurs through ...
CNST 251 Chapter 6 || All Correct.
Leakage and diffusion of gas (such as air vapor) through a building envelope are two different
mechanisms because
a. leakage occurs through holes, cracks, and openings in the envelope, while diffusion occurs
through the body of an envelope component or its materials
b. leakage occurs through the body of an envelope component or its materials while diffusion
occurs through holes, cracks, and openings in the envelope
c. diffusion does not occur through a building envelope while leakage does
d. leakage refers to water leaking through the envelope (such as rainwater or subsoil water) and
diffusion refers to the passage of water vapor through the envelope
e. none of the above correct answers a. leakage occurs through holes, cracks, and openings in the
envelope, while diffusion occurs through the body of an envelope component or its materials
Although leakage and diffusion are two separate mechanisms, their impact on the performance of
the envelope is the same
a. True
b. False correct answers a. True
Air leakage through a building envelope is a function of
a.the area of holes cracks and openings in the envelope
b. wind speed
c. material of which the component is made
d. all of the above
e. a, b, and the inside-outside air temperature differences correct answers e. a, b, and the inside-
outside air temperature differences
A membrane air barrier is
a.fastened to sheathing on site
b. adhered to sheathing on site
c. factory-adhered to sheathing panels
d. any one of the above correct answers d. any one of the above
A warp-type, membrane air barrier is available in many varieties, but in all of them , it is made
from
a. an unperforated plastic sheet
, b. a perforated plastic sheet
c. an asphalt-coated paper
d. any of the above
e. a or c correct answers b. a perforated plastic sheet
Liquid-applied air barriers and membrane air barriers can be used interchangeably
a. True
b. False correct answers b. False
An air barrier is generally placed
a. toward the warm side of the envelope assembly
b. toward the cold side of the envelope assembly
c. on the exterior face of interior gypsum board
d. on the exterior face of an exterior sheathing
e. b or c correct answers d. on the exterior face of an exterior sheathing
An air barrier is generally used on
a. the walls
b. the ceiling
c. the roof
d. all of the above correct answers a. the walls
The primary purpose of sealants and weatherstripping is to
a. reduce vapor diffusion through the envelope
b. reduce air leakage through the envelope
c. reduce air diffusion through the envelope
d. all of the above
e. a and b correct answers b. reduce air leakage through the envelope
The use of membrane or liquid air barriers is required in the envelope of all heated or cooled
buildings
a. True
b. False correct answers a. True
Breathability of an air barrier refers to its
a. permeability to air,water vapor, and water
b. permeability to air and water vapor
c. permeability to air
d. permeability to water
e. none of the above correct answers e. none of the above
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