2. building enclosure intro
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Often referred to as building physics in Europe.
Definition:
Building science is the systematic study of the physical performance ofbuildings under natural conditions.
It is an applied science that draws on the more fundamental sciences ofphysics, chemistry, and biology.
Building science provides the base of knowledge and understandingthat permits designers, builders, product manufacturers, and building
code officials to deliver buildings that are durable, useful, sturdy,healthful, and comfortable.
William Rose, Water in Buildings
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One way of classifying the major systems
of buildings is by their function:
The building envelope or enclosure is an assembly of componentswhich separates two different environments
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At times this assembly is best characterized byits ability to resist forces, stresses or loads
solar
radiation
precipitation
exterior air
temperature
soil
temperature
interior air
temperature
soil moisture
level
exterior air
moisture level
interior airmoisture level
exterior air pressure &
movement
interior air pressure &
movement
occupant
activity level
occupant count
building thermal
mass
exterior noise
interior noise
At other times it is better characterized by its ability to controlthe movement of energy and matter, more like a filter.
heattemperature differences
liquid watermomentum, air pressure
differences, gravity, capillarity
air
air pressure differences
soundsound level differences
radiationelectromagnetic energy
water vapourvapour pressure differences
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foundations
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exterior walls &
windows
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floors over basement
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floors over c rawlspace
The various elements of thebuilding enclosure must forma continuous and closedpath
separating interior fromexterior space
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Performance:
overall technical performance of the assembly, identification & functionof each individual component (some perform multiple functions)
Assembly: relationship of components to one anot her & the sequence of their
assembly within the construction, attachment methods, trades involved,
tolerance for movement
Durability:anticipated functional lifetime of each element, maintenance
requirements, potential for replacement of the various components
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