The building envelope Flashcards
Which are the four control layers and
which processes are they supposed to deal with?
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Is it a distinction between damp and water? Explain!
Damp is not yet saturated water, but still wet
Pressure differences over the building envelope. What is meant by the “stack effect”?
?
What is the driver for the air movement, and which is the direction?
Density: Hot air rises upwards due to its lower density.
Pressure: Hot air expands, creating pressure. Then flows towards cold side of space (Due to sun on one side)
What is meant by driving rain?
?
How is a building influenced by driving rain?
?
What is meant by a cavity wall?
Give examples on different types of drained-screened wall systems.
?
Explain about the control layers in a wall of this kind.
In a cavity wall – how is drying made possible?
What is the meaning of having a cavity tray (or water diverter) in a cavity wall?
Can something be explained about the critical parts in the assembly (or excecution) of a high
performance filled cavity wall?
Why is it so important to avoid air movements around the thermal insulation boards in a cavity
wall?
About the mass storage wall systems
What kind of rain protection will they give?
About the mass storage wall systems
Give some examples
About the mass storage wall systems
Where can we find the control layers in this kind of walls?
About the mass storage wall systems
What is meant by “dry stone walls”?
What tells the example of the brick wall with different kinds of thermal insulation on the inner
side about the process of moistening and drying of a compact brick wall?
In the example of water absorption of a brick and a concrete wall, what are the consequences of
water absorption and what are the consequences of high run off?
Water in the ground
Explain about a damp-proof course in a basement.
Water in the ground
Explain different levels of water in the ground and is the type of soil important in this case?
Water in the ground
What is capillary action and where does it happen?
Water in the ground
What is rising damp and how does the transport of salt by rising damp work?
Water in the ground
How can effloresce of salt happen and how is the visibility of it related to the relative humidity?
Water in the ground
What is frost erosion and what is it’s mechanism?
Water in the ground
What is spalling?
Water in the ground
How can we hinder capillary moisture transport in a basement wall?
How can we understand the temperatures in the ground in winter and summer solstice
respectively?
What is the problem with frozen soil and why does it happen and how can problems be avoided?
When temperature is measured deeper and deeper in the ground, how will it vary, and what temperature is expected 20 meters down in the ground?
Explain the idea with the crawl space foundation, or what is meant by a crawl space foundation?
What is meant by a slab on ground foundation?
How can a heating system be incorporated in the ground slab?
What is meant by a basement foundation?
Explain about moisture protection in a basement.
Explain about thermal insulation of a basement wall.
Explain about different ways for damp or water to pass the air gap in a cavity wall:
What happens when a thermal insulation material becomes damp?
Explain about different ways for damp or water to pass the air gap in a cavity wall:
Water that flows on the inner of the outer leaf and rises at the inner leaf
Explain about different ways for damp or water to pass the air gap in a cavity wall:
The possible problem with wall ties.
Explain about different ways for damp or water to pass the air gap in a cavity wall:
Problems with gaps in the thermal insulation
Explain about different ways for damp or water to pass the air gap in a cavity wall:
What may be the problem with indoor air reaching the gap in the cavity wall?
Explain about different ways for damp or water to pass the air gap in a cavity wall:
What is the problem with “air washing” round the batts of thermal insulation?
Explain about different ways for damp or water to pass the air gap in a cavity wall:
The summer damp case.
What is meant by perfect wall barrier systems?
EIFS or ETICS – what is that and what happens in case water enters the inner of a wall of this type?
Explain differences in placing the vapor membrane depending on the climate.
What can we make out of looking at comfort zones in summer and winter and combining them with areas of moisture and temperature outdoors, and putting them into a mollier-diagram?
Explain design of a wall to window connection in different climates.
Where should the control layers be?
Explain about why the line for the break of a thermal bridge should be quite straight through the construction.
How is a joint seal designed?
What determines the ideal width of a joint seal between two concrete elements in a wall?
Why is it good having a threshold in a horizontal joint?
How can a horizontal joint be drained?
How is the joint between a window frame and a wall designed?
Explain about damage in joints.
What is the difference between a one step-joint and a two step-joint?
How are joints assembled in a floor and why is it done in that way?
It is worth thinking about the different weather barrier concepts.
Explain “the weather barrier concepts”
