Ch. 41 Moisture Protection and Thermal Insulation Flashcards
How would you apply a bitumous coating to the exterior side of a foundation wall?
You would either Brush or Spray this type of coating
Why would you apply a cementitious coating to the exterior side of masonry or concrete foundation wall?
In order to provide a smooth surface to to apply a waterproof membrane to. Sometime powdered Iron will be mixed into the portland cement as an add mixture to provide a tighter seal
_______ is the control of moisture and water that is subject to hydrostatic pressure.
Water-proofing is the control of moisture and water that is subject to hydrostatic pressure.
What is a geotextile mat?
A mat that can be used to alleviate hydrostatic pressure
__________ is the flow of heat within a material or between materials without displacement of particles.
Conduction is the flow of heat within a material or between materials without displacement of particles.
________ is the transfer of heat within a fluid, either gas or liquid, by the movement of the fluid from an area of higher temperature to an are of lower temprature
Convection is the transfer of heat within a fluid, either gas or liquid, by the movement of the fluid from an area of higher temperature to an are of lower temprature
What is the best theoretical type of insulation?
a vacuum
What is R-Value?
R-Value or the reistance of a material is measured by the number of hours needed for 1 BTU to pass through 1 Square Foot of material
T/F The lower the materials K-value or C-Value (conductance) the better the insulating qualities.
True
What is the reciprocal of R-Value?
k-Value (C-Value)
What does LTTR stand for?
Long Term Thermal Resistance
How is LTTR measured
It is the averaged R-Value of a material across a 15 year period
What is the formula for R-Value
R= (Temperature Difference * Area * Time) / Total heat loss
What is a radiant barrier?
A radiant barrier is a single sheet of highly reflective material, usually aluminum that faces an open airspace, it is used to reduce the passage of thermal radiation.
What is reflective insulation?
Reflective insulation is the combination of a radiant barrier with thermal insulation.
What is emissivity in regards to radiant barriers?
a number between 0 and 1 that indicates the amount of energy that by conduction is absorbed through the material and is emitted back into the building.
In regards to roofing what are the properties of a Thermoset Plastic roof?
They are hardened by heat and cannot be reheated without irreversible damage.
What are 4 examples of thermoplastic roofing?
EPDM - only available in black
CPSE (Hypalon) - highly resistant to weathering and available in white
PVC - Available in White seams have to be sealed or mechanically fastened, very inexpensive
TPO - Low install cost relative to EPDM, and is available in white
Low performance joints are used where there is less than ____ movement
5% movement
Intermediate performance joints are used where there is less than ____ movement
12.5% movement
High performance joints are used where there is less than ____ movement
Up to 25% movement
What should the sealant depth be for joint widths between 0-1/2”
equal to the width
What should the sealant depth be for joint widths between 1/2”-1”
1/2”
What should the sealant depth be for joints with width’s greater than 1”
Joints should be half the width
