BTECH ARCH 626 Exam 3 Questions & Answers 2024/2025
r value - ANSWERSmeasure of thermal resistance. buildings want high measure
u value - ANSWERSmeasure of how building elements conduct heat. buildings want low measure
relationship between r and u value - ANSWERSr value is the inverse of...
r value - ANSWERSmeasure of thermal resistance. buildings want high measure
u value - ANSWERSmeasure of how building elements conduct heat. buildings want low measure
relationship between r and u value - ANSWERSr value is the inverse of u value
what do energy star insulation zones do - ANSWERSdetermine the recommended home insulation r
values by location
air barriers / air retarders - ANSWERSall holes should be plugged. this creates a sealed boundary
between the exterior and interior
what is vapor diffusion - ANSWERSthe movement of moisture in a vapor state through a material due to
vapor pressure variation (warm side of the assembly to the cold side)
vapor permeability - ANSWERSa material that fully blocks water vapor is impermeable. a material that
allows the passage of vapor is permeable.
PERMS - ANSWERSpermeability unit. most building codes require material to be impermeable of 1 PERM
or less
examples of impermeable materials - ANSWERSpolyethylene film
single ply membranes
glass
aluminum foil
sheet metal
,kraft paper
closed cell foam insulation
oil based paints
examples of semipermeable materials - ANSWERS#30 building paper
OSB
latex paints
open cell foam insulation
ice and water shields
examples of permeable materials - ANSWERSunpainted gypsum board
unfaced fiberglass/cellulose insulation
board lumber
unsealed masonry
how do climate zones affect the building env - ANSWERSdifferent zones require different design
strategies. ex: adding humidity vs taking it away
vapor barrier location in cold dry climates - ANSWERSenv dries to the outside
vapor barrier location in hot humid climates - ANSWERSenv dries to the inside
vapor barrier location in mixed temp climates - ANSWERSallow building to breath while retaining r value
and air and water tightness
fiberglass insulation pros and cons - ANSWERSpros:
easy installation
inexpensive
easy assembly
, works
cons:
low recycled content
harmful to installers
formaldehyde binders
hard to avoid gaps if not perfectly placed
may not get claimed r value
what is dry blown cellulose fiber insullation - ANSWERSmade with recycled newspaper
must have retardant and pest resistance chemicals added
how is dry blown cellulose fiber installed - ANSWERSblown in place with netting stapled to studs
characteristics of dry blown cellulose fiber - ANSWERSrequires special tools and techniques
densely packed to try to avoid settling overtime
wet sprayed cellulose fiber insulation : installation - ANSWERSblown in place and compacted flush to the
face of the studs
wall must be able to breathe in or out or both to avoid long term drying
very compact insulation will have r value and not settle
closed cell spray foam : installation - ANSWERSblown in place and trimmed flush to face of studs
curry comb scrapes off insulation proud of finish frame
composite insulation solutions - ANSWERSmultiple insulation types can be combined to solve various
problems
what is the dew point - ANSWERSwhere condensation forms if insufficient air is at the wrong
temperature
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