Insulation Flashcards
A draft is a current of cold air that causes:
discomfort
the largest factor in the thermal resistance of a wall is
insulation
a ceiling shouold have an r factor equivalent to or more than
r-19
a wall should have an r factor equivalent to or more than
r-13
a wood frame raised floor should have an r factor equivalent to more than
r-13
the percentage of efficiency in an average homes heating system is
50-65%
moisture barriers should be placed ____ in the construction of a basement
below the floor
ventilation for a crawl space is supplied
all year round
heating is a probelm for split level houses because
each level must be treated seperately
combustible material may be no closer than ____ from a furnace (Side and rear)
1 in
a flue vent outlet or chimney must be a minimum of ____ above the roofs highest point
2 ft
R represents
thermal resistance
to meet title 24 energy standards for apartments and hotels, fans moving air to the outdoors must have
automatic back dampers
the material which has the lowest R value per inch is
vermiculite
which material has the highest R value per inch
polyurethane foam
when the insulation material is blown into an attic or ceiling o the minimum R-19 rating, the best insulation materials are in what order
1.cellulose with a thickness of 5”
2.rock wool with a thickness of 6-1/2”
3.fiberglass with a thickness of 8-3/4”
is rock wool is a better insulation material than fiberglass
yes
The energy standars come under
title 24
a minimum of ____ is neccessary for access to the front of the furnace
24 in
the ability of various materials to conduct heat varies considerably. good conductors such as the metal frame of a window or poor conductors such as wood, gases and asbestos, transmit heat by conduction. This is a physical property called
thermal conductivity (k)
____ is defined as the amount of heat (BTU) that passes through a material 1 inch thick and 1 sq ft in area in 1 hour with a temperature difference of 1 degree F. Between the outer and inner surface.
Thermal conductivity (K)
____ is a meausre of teh rate of heat flow
conductance (U value)
____ is a measure of a metrials ability to retard heat flow
Thermal resistance (R value)
the ____ value indicates the ability of a specific material (i.e. 6” of mineral fiber sinsualing) to resist heat flow
R
The higher the ____ value, the higher the insulating value
R
Insulating materials depend upon trapped air within their construction for their insulating
qualities
single strength glass has a U value (conductance, a measure of the rate of heat flow) of:
1.13
the heat loss through cracks in the building is called what
inflitration
on which side of teh wall or heated area of the building should the vapor barrier always be placed
warm
Which of teh following is the best floor insulation
foil faced fiberglass
whcih must be insulated in a new house
the floors, walls and ceilings
what has the highest R-value
polyurethane
what is the difference between blanket insulation and batt insulation
the length
which of the following happens when insulation gets wet
-it compacts
-it settles
-it permanently loses its insulating value
where do you get maximum heat gain in a house
from the windows
which type of glass allows the least amount of cool air or warm air to escape
double glazed
double paned windows best pay for themselves in which climates
extremely cold winters adn extremely hot summers
how many motors will need to be installed for ventillation for a storage garage of 180,000 cu ft with motors which can vent 1000 cu ft per minute, if the air must turn over 4 times in 10 hours
3
what provides the greatest R-Value and what is it
urethane boards R-value=6.2
what is the U-value if the R-value of a material is .25 per inch and its thickness is 6 inches
.67
for a mroe effective seal, the tabs of vapor barrier covering flexible insulation are stapled to
the inside edges of the framing members
if insulation is covered on both sides , only one side acts as a vapor barrier and should face which side
the warm side
reflective insulation generally consists of
aluminim foil
which of the following best defines the term R
the resistance of a material to teh flow of heat
ventilators are what
are left open all year
when is reflective insulation effective
when facing air space of 3/4 inch deep
vapor barriers
should not be installed on ceilings unless the roof pitch is less than 3 in 12
squessing or compressing flexible insulation tightly into spaces
reduces its effectivness
there should be an air space between the insulation and roof sheathing of at least ____ when insulation is placed between roof framing members
1-1/2 inches
which of the following is the most efficient insulator
wood
