Exam (elaborations)
EXAC - THERMAL INSULATION QUESTIONS AND ANSWERS FULLY SOLVED
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EXAC - THERMAL INSULATION
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EXAC - THERMAL INSULATIONWhat is EIFS? - answer Exterior Insulation and Finish System
Exterior insulation and finish system (EIFS) is a general class of non-load bearing
building cladding systems that provides exterior walls with an insulated, water-resistant,
finished surface in an integrated composite material system.
-Insulation board, made of polystyrene or polyisocyanurate foam.
-A specially formulated adhesive and/or mechanical attachment of the insulation to a
substrate.
-Glass fiber reinforcing mesh.
-A durable, water-resistant base coat, which is applied on top of the insulation that
functions as the weather barrier.
-An attractive and durable finish coat — typically using acrylic co-polymer technology —
which is both colorfast and crack-resistant.
what are the type of EIFS SYSTEM - answer-polymer-modified system
thick coat
portland cement base coat 1/4" to 3/8"
reinforced with fibre glass mesh or metal wire lath
used in areas of high impact - close to ground level
finish coat - portland cement with acrylic polymer
polymer based system.
thin coat
portland cement or acrylic polymer base coat 1/16" to 1/4"
reinforced with fibre glass mesh
used in areas of low impact - crack resistant but susceptible to dents and punches
finish coat - acrylic polymer
Batt Insulation - answerFiberglass or rock-wool insulation with various thicknesses. May
or may not have a paper covering.
fibre glass, rock-wool insulation is considered as fire-resistant.
rigid insulation? - answerUsable in all parts of building
Made in board form for walls foundations and roofs
Examples : Polystyrene, Polyurethane, Polyisocyanurate, Glass Fiber
nonstructural insulating board of foamed plastic or
, cellular glass- Cellular glass insulation is fire-resistant, impervious to moisture, and
dimensional stable, but has a lower a thermal resistance value than foamed plastic
insulation, which is flammable
and must be protected.
-Ridged insulation is moisture resistant and maybe used in contact with the earth.
Foamed-in-place insulation - answerThermal insulation in the form of a foamed plastic,
such as polyurethane, that is sprayed or injected into cavity where it adheres to the
surrounding surfaces - example polyurethane
Loose-fill insulation? - answerThermal insulation in the form of mineral wool fibers,
granular vermiculite or perlite, or treated cellulosic fibers, poured by hand or blown
through a nozzle into a cavity or over supporting membrane
Reflective insulation? - answerThermal insulation in the form of a material of high
reflectivity and low emissivity, such as paper-backed aluminum foil or foil-backed
gypsum board, used in conjunction with a dead air-space to reduce the transfer of heat
by radiation
What is polystyrene? - answerthalli - combustible insulation - flammable
and must be protected. Ridged insulation is moisture resistant and
maybe used in contact with the earth.
what is the xps and eps insulation? - answerexp is expended polystyrene - low r-value -
cheaper.
xps is extruded polystyrene - high r-value - expansive. comes in insulation boards.
which rigid insulation is fire resistant? - answercellular glass insulation is fire-resistant,
moisture resistant but have low r-value.
vapour barrie? where in the wall assembly, it should be installed - answervapour barrier
should be installed at the warm side of the wall assembly.
vapour barrier should prevent moisture from entering the wall cavity and reach its dew
point in insulation. it causes mold and material deterioration.
What are air barrier design requirement ? - answerAIR BARrier DESIGN
REQUIREMXNTS
Materials and the method of assembly chosen to build an air barrier must meet several
requirements if they are to perform the air leakage control function successfully.
1. There must be continuity throughout the building envelope. The air barrier material of
the wall must be continuous with the air barrier material of the roof (e-g., the roofing
membrane). The air barrier material of the wall must be connected to the air barrier
material of the window he, etc .
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