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Property > Building Pathology > Flashcards

Building Pathology Flashcards

1
Q

What are the most common causes of cracks appearing in buildings?

A
  • ground movement (e.g. clay shrinkage, vibration)
  • decay of building fabric (e.g. woodworm)
  • materials expanding due to thermal movement
  • tree root growth
  • foundation failure
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2
Q

What are the three main types of dampness?

A
  • penetrating dampness
  • rising dampness
  • condensation
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3
Q

How do you rectify dampness in a building

A

Figure out what type of dampness it is, find the source and find solution to prevent the moisture buildup

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4
Q

How do you minimize condensation buildup in a property?

A

Heating, insulation, ventilation and reduce moisture generation (e.g. by keeping lids on pots)

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5
Q

What are the differences between dry and wet rot?

A

Wet Rot:
- large black fungus coating
- timber will feel sift and spongy
- damaged or flaky paint

Dry Rot:
- timber shrinks and becomes cracked
- damp, must smell
- myselium turns lemon-yellowish

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6
Q

What issues might you face if there is an area of flat roof on a building?

A
  • ponding
  • watermarks
  • vegetation
  • movement
  • punctures
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7
Q
A
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8
Q

What is building pathology?

A

The scientific study of the nature building failure and its causes, processes, development and consequences

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9
Q

What is the importance of building pathology?

A
  • manage deterioration of the built environment
  • conservation of historic buildings
  • ensure that correct repairs and maintenance are undertaken
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10
Q

What are the factors effecting the physical condition of a building

A

Look at slide 11 bitch

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11
Q

What buiding defects affect the physical condition of a building?

A

look at slide 12

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12
Q

What are the 6 ‘widths’ of cracks?

A

Identified by the Building Research Establishment to identify how severe cracks in abuilding are

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13
Q

What are hairline cracks?

A

Cracks less than 0.1mm in width. No repair action required

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14
Q

Name five types of cracks

A
  • hairline cracks
  • stepped cracks
  • vertical cracks
  • cracks that are wider at the top or bottom
  • horizontal cracks
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15
Q

What is subsidence?

A

Subsidence occurs when the soil beneath a building is unstable and sinks downward (opposite = heave)

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16
Q

What are three causes of subsidence?

A
  • ground shrinkage due to loss of moisture
  • collapsing drains
  • improperly compacted ground
17
Q

What are some methods of prevention and mediation of subsidence?

A
  • tree root barriers (quick and cost-effective)
  • re-pointing
  • underpinning
18
Q

What is underpinning?

A

excavated soil from beneath existing foundations is replaced with a material (usually concrete) which forms a new foundation under the existing one

19
Q

What are the main types of underpinning? (4)

A
  • mass concrete underpinning
  • beam and base underpinning
  • mini-piled underpinning
  • expanding resin injection
20
Q

What danger does water pose to buildings? (4)

A
  • flood
  • leaks
  • condensation
  • dampness
21
Q

Two kinds of dampness?

A
  • penetrating dampness
  • rising dampness
22
Q

What is penetrating dampness?

A

any moisture sourced from outside the habitable space with penetrates the building

23
Q

What is rising dampness?

A

The phenomenon where water moves upwards through a buiding element

24
Q

What is the problem with penetrating dampness?

A

moisture often shows in areas which are not close to their source so finding the source of the dampness can be problematic

25
Q

How is rising dampness prevented?

A

1875 government legislation which states that all buildings must have DAMP PROOF COURSE (DPC) in its walls. These are impermeable sheet materials placed in critical areas which seal the building

26
Q

What is vapour pressure?

A

The pressure water vapour in the air exerts

27
Q

What is relative humidity

A

the ratio of the actual amount of water vapour present to the amount that would be present if the air was saturated at the same temperature (whether the air is dry or water-laden)

28
Q

What is the dew point?

A

the temperature of the air when condensation of liquid water starts when the air is cooled at constant vapour pressure

29
Q

What does condensation cause?

A
  • mould
  • condensate
  • decay of timber
  • corrosion of metals
30
Q

Why did the chicken cross the road?

A

To get to the other side

31
Q

Who is going to ACE their exam tomorrow

A

YOU!

32
Q

What is the cure for condensation?

A

Heating, insulation ventilation and reducing moisture generation

33
Q

What can cause wet rot? (3)

A
  • leaky roof
  • leaky pipes
  • washing appliances not connected properly
34
Q

How do you prevent wet rot? (3)

A
  • STOP THE SOURCE OF MOISTURE
  • make sure timber is clear of soil and debris
  • paint exposed timber

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