Week 11 Thermal Protection Flashcards
Roofing materials provide the _________ covering for a roof system. They range in form from virtually continuous, impervious membranes to overlapping or interlocking pieces of shingles and tiles.
Additional factors to consider in the selection of roofing material include requirements for installation, maintenance, and durability, resistance to wind and fire, and, if visible, the roofing patter, texture, and color.
True or false?
Roofing materials provide the water-resistant covering for a roof system. They range in form from virtually continuous, impervious membranes to overlapping or interlocking pieces of shingles and tiles.
True. Additional factors to consider in the selection of roofing material include requirements for installation, maintenance, and durability, resistance to wind and fire, and, if visible, the roofing patter, texture, and color.
To prevent water from leaking into a roof assembly and eventually the interior of a building, ______ must be installed along roof edges, where roofs change slope or abut vertical planes, and where roofs penetrated by chimneys, vent pipes, and skylights. Exterior walls must also be _____ where ______ might occur- at door and window openings and along joints where materials meet in the plane of the wall.
Exterior walls also must provide _____ from the weather.
To prevent water from leaking into a roof assembly and eventually the interior of a building, flashing must be installed along roof edges, where roofs change slope or abut vertical planes, and where roofs penetrated by chimneys, vent pipes, and skylights. Exterior walls must also be flashed where leakage might occur- at door and window openings and along joints where materials meet in the plane of the wall.
Exterior walls also must provide protection from the weather.
Potential heat _____ or ______ is an important factor when estimating the amount of mechanical equipment and energy required.
The proper selection of building materials, the correct construction and insulation of the building enclosure, and the orientation of a building on its site are the basic means of controlling ________.
Potential heat loss or gain is an important factor when estimating the amount of mechanical equipment and energy required.
The proper selection of building materials, the correct construction and insulation of the building enclosure, and the orientation of a building on its site are the basic means of controlling heat loss and gain.
The primary purpose of thermal insulation is to control the ___________ of heat through the exterior assemblies of a building and thereby prevent excessive heat loss in cold seasons and heat gain in hot weather. This control can effectively _____ the amount of energy required by heating ad cooling equipment to maintain conditions for human comfort in a building.
The primary purpose of thermal insulation is to control the flow or transfer of heat through the exterior assemblies of a building and thereby prevent excessive heat loss in cold seasons and heat gain in hot weather. This control can effectively reduce the amount of energy required by heating ad cooling equipment to maintain conditions for human comfort in a building.
Because temperature differential is usually greater in the roof zone of a building, the roof structure requires more _________ than wall or floor structures.
Continuity should be maintained at foundation, floor, wall, and roof junctures to form an unbroken ________ of protection against heat transmission.
Insulating glass and weatherstripping _____ heat transfer at windows and doors.
Because temperature differential is usually greater in the roof zone of a building, the roof structure requires more thermal insulation than wall or floor structures.
Continuity should be maintained at foundation, floor, wall, and roof junctures to form an unbroken envelope of protection against heat transmission.
Insulating glass and weatherstripping limit heat transfer at windows and doors.
Thermal insulation is required between heated and ________ spaces.
The temperature differential between basement spaces and the ground is _____ than between indoor spaces and the outdoors above grade.
Thermal insulation is required between heated and unheated spaces.
The temperature differential between basement spaces and the ground is less than between indoor spaced and the outdoor above grade.
For specific R-values of materials and building components such as windows, consult the _____________.
__ is a measure of thermal resistance of a given material. It is expressed as the temperature difference required to cause heat to flow through a unit area of material at the rate of one heat unit per hour.
____ is a measure of thermal transmittance of a building component or assembly. It is expressed as the rate of heat transfer through a unit area of a building component or assembly caused by a difference of one degree between air temperatures on the two side of the component or assembly. The U-value for a component or assembly is the _____ of its R-value.
For specific R-values of materials and building components such as windows, consult the product manufacturer.
R is a measure of thermal resistance of a given material. It is expressed as the temperature difference required to cause heat to flow through a unit area of material at the rate of one het unit per hour.
U is a measure of thermal transmittance of a building component or assembly. It is expressed as the rate of heat transfer through a unit area of a building component or assembly caused by a difference of one degree between air temperatures on the two side of the component or assembly. The U-value for a component or assembly is the reciprocal of its R-value.
Insulating Materials:
________ consists of flexible, fibrous thermal insulation of glass or mineral wool, made in various thicknesses and lengths and in ____” or ____” widths to fit between studs, joists, and rafters in light wood frame construction, faced with a _______.
_______ insulation is a preformed, nonstructural insulation board of foamed plastic of cellular glass. ______ insulations having closed cell structures, such as extruded polystyrene and cellular glass, are moisture resistant and may be used in contact with ____.
Batt insulation consists of flexible, fibrous thermal insulation of glass or mineral wool, made in various thicknesses and lengths and in 16” or 24” widths to fit between studs, joists, and rafters in light wood frame construction, faced with a vapor retarder.
Rigid foam insulation is a preformed, nonstructural insulation board of foamed plastic of cellular glass. Rigid insulations having closed cell structures, such as extruded polystyrene and cellular glass, are moisture resistant and may be used in contact with earth.
Insulation Materials
_________ insulation consists of a foamed plastic, as polyurethane, that is sprayed or injected into a cavity where it adheres to the surrounding surfaces.
___________ insulation consists of mineral wool fibers, granular vermiculite or perlite, or treated cellulosic fibers, poured by hand or blown though a nozzle into a cavity or over a supporting membrane.
________ insulation uses a material of high reflectivity.
Foamed-in-place insulation consists of a foamed plastic, as polyurethane, that is sprayed or injected into a cavity where it adheres to the surrounding surfaces.
Loose-fill insulation consists of mineral wool fibers, granular vermiculite or perlite, or treated cellulosic fibers, poured by hand or blown though a nozzle into a cavity or over a supporting membrane.
Reflective insulation uses a material of high reflectivity.
What 3 insulations are typically used in a wall cavity?
Batt or blanket
Foamed in place
loose fill
Extruded polystyrene can be used in contact with earth but any exposed surfaces should be protected from ______
Extruded polystyrene can be used in contact with earth but any exposed surfaces should be protected from sunlight
Roofing fasteners must be ____ enough to penetrate through insulation nd into decking.
Maintain at least __” clear space for ventilation over insulation.
Maintain ______ of insulation at floor junctures.
Vapor retard on _____ or ______ side of wall.
Roofing fasteners must be long enough to penetrate through insulation nd into decking.
Maintain at least 1” clear space for ventilation over insulation.
Maintain continuity of insulation at floor junctures.
Vapor retard on warm or heated side of wall.
Moisture resistant foam insulation such as extruded polystyrene can continue down below ___ to the frost line to insulate a ______ space.
Protect exposed surfaces with ______ plywood or similar material.
Moisture resistant foam insulation such as extruded polystyrene can continue down below grade to the frost line to insulate a basement space.
Protect exposed surfaces with treated plywood or similar material.
Because it is a gas, moisture vapor always migrates from ___ to _____ pressure areas. This normally means it tends to diffuse from the _____ humidity levels of a building’s interior toward the ______ humidity levels outside.
Most building materials offer _____ resistance to this passage of moisture vapor. If the moisture vapor comes into contact with a cool surface whose temperature is at or below the dew point of the air, it will _____.
Because it is a gas, moisture vapor always migrates from high to lower pressure areas. This normal means it tends to diffuse from the higher humidity levels of a building’s interior toward the lower humidity levels outside.
Most building materials offer little resistance to this passage of moisture vapor. If the moisture vapor comes into contact with a cool surface whose temperature is at or below the dew point of the air, it will condense.
Condensation can lessen the effectiveness of _________, be _______ by building materials, and _________ finishes. Moisture vapor, therefore, must be:
- Prevented by __________ from penetrating the enclosed spaces of exterior construction;
- Or be allowed to escape, by means of ________, before it can condense into a liquid.
Condensation can lessen the effectiveness of thermal insulation, be absorbed by building materials, and deteriorate finishes. Moisture vapor, therefore, must be:
- Prevented by vapor retarders from penetrating the enclosed spaces of exterior construction;
- Or be allowed to escape, by means of ventilation, before it can condense into a liquid.
