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Flashcards in Building Pathology Deck (121)
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1

What are typical defects associated with Georgian Properties?

Damp
Roof Defects
Walls
Foundations

2

What are the common defects to a Georgian Building Wall?

Penetrating damp due to single skin wall
Frost Damage
Sulphate Attack
Spalling

3

What are the typical defects to a Georgian Building Roof?

Roof spread
Roof Sag
Defective slate tiles

4

Can you name steel related defects?

Rust
Corrosion
displacement

5

What are the main components in a Victorian Roof?

(top down)
Slates or tiles
Underfelt (in late Vic era)
Ride plat
Rafters
Purlin
Ceiling Joists
Wall Plate

6

What are the typical defects of a Victorian Roof?

Roof sag
roof spread
rotten timbers
delaminating slates
defective valleys
defective flashings

7

Can you explain interstitial condensation and where it can be found?

Condensation which occurs between building elements
Can be found in cavities
Cold roofs
Defective double glazing

8

On Sadler House what kind of sealant did you recommend?

This was specified in accordance with the Weber light weight render system.

9

What are the tell tale signs of rising damp?

Horizontal tide marks, peeling paint or plaster

10

What remedial works did you specify for 47 David Place?

DPC was shattered and i specified an injected DPC
Down pipe discharging onto paved area where damp was located, this was relocated.

11

What remedial works did you specify for the external cracked areas to 47 David Place?

Just under 5mm i specified pointing up with lime mortar.

12

What are the common victorian walls?

solid or cavity

13

How would you identify if the victorian wall has a cavity?

This was be approx 20-30 mm thicker than a 230mm solid brick wall.

14

Can you inject insulation into a Victorian

No the gap would need to be at least 50mm.

15

What are the three common defects to masonry in Vic buildings?

spalling
frost
sulphate attack

16

What is the tell tale sign of frost damage in brick work?

spalling surface

17

How would you repair spalling brickwork?

Depending on severity, remove brick with all saw and reinsert the other way around.

Rebuild with lime mortar and pigments

If not reparable replace with appropriate porous brick.

18

Why is remediating Victorian walls with lime important

lime is breathable whereas modern cement is not

19

What is the typical defect at the end of a Victorian terrace?

leaning

20

Why is leaning a typical structural defect to victorian buildings at the end of a terrace?

Because the side wall often has little restraint.

21

What is the typical construction of a Victorian Building Foundation footing?

This would be a stepped footing.

22

Relating to Victorian Buildings describe a stepped footing?

Trenches are approx 450mm deep and the foundations are layed with bricked starting 700mm in width decreasing as they extend up.

23

Describe load bearing in some common soil types? (four types)

Chalk and rock are firmest.
Sand and gravel have good characteristics
Peat is poor
Clay is good but subject to shrinkage and swelling.

24

Describe the process of shrinking and swelling to clay soil?

Wet periods clay swells, whereas in dry periods clay shrinks and cracks.

25

What is the difference between subsidence and differential settlement?

Subsidence is caused by a change in the soil load bearing capacity or differential movement due to the varying depth of foundations.

Settlement is when the building moves as a whole when first built.

26

What is the most common cause of subsidence?

Tree related.

27

What is the problem with removing a tree which is close to a building?

The sub-strata may swell and cause heave.

28

What are the options for managing a tree which causes high amount of shrinkage?

Pollarding or Heavy pruning.

29

What is the problem with underpinning a terrace block of Victorian Buildings?

This is likely to move the subsidence to another area. An alternative option would be to pollard the area, if possible.

30

What are the common roofs types in victorian buildings?

Pitched, butterfly and lean too.