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ARC 242 Woods tech > lecture 14 > Flashcards

lecture 14 Flashcards

waterlogged

1
Q

what is ground water?

A

the water held underground in soil or permeable rock

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2
Q

hydrostateic pressure

A

this is the pressure at a point in a fluid at rest due to the weight of the fluid above

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3
Q

what is the first rule of dealing with ground water?

A

do not let the water enter the ground at the building

SLOPE the site away from the building

  • make sure the downspouts are directed away from the building
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4
Q

what makes the groundwater become hystrostatic pressure?

A

gravity

not horizontal movement

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5
Q

what is the best ways to treat a building below grade to prevent groundwater intrusion? (2)

A

dampproofin

water proofing

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6
Q

what is dampproofing

A

a way of treating the foundation of a building to prevent moisture intrusion from the surrounding soil

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7
Q

what is bituminous

A

a coating spray or painted on the surface as a protective coat

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8
Q

underground mansonry walls need to be

A

parged

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9
Q

parging is

A

a thin rough coat of Portland cement plaster applied to masonry walls

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10
Q

waterproofing has what characteristics

A

self adhering membrane
flexible
liquid-applied product
continuous

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11
Q

the applicaiton to prevent groundwater intrusion must be protected during

A

the backfill process

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12
Q

how do we protect during the backfill process

A

we can use a board product
or
drainage mat
or
rigid insulation

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13
Q

how do we deal with draining excess groundwater away from the building as it moves toward the footing?

A

drainage mats- they carry water down to the footing from above

then at the footing we install a drainpipe that runs around the building- it is perforated to allow water to enter

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14
Q

drain pipes are what

A
  • footing drians- drain tile
    it is set in a bed of crushed stone/gravel to allow for easy water flow
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15
Q

what is wrapped around the gravel area to preven soil intrusiton

A

filter fabric

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16
Q

the drainage pipe is sloped to allow for

A

the water to run into the storm draing

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17
Q

what materials can the drain pipe be

A

concrete, pvc, cast iron, or clay

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18
Q

what is water vapor

A

the gaseous form of water found in some quantitiy in virtually all air on the planet

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19
Q

saturated air-

A

air that contians the max amount of water vapor it can hold

this ammount increased as the temp of the air increase

20
Q

relative humdity

A

the measure of the amount of water vapor in the air as a factor of how much total water vapor that air can hold

21
Q

dew point-

A

the temp of the air at which the water vapor satruation of the air has become 100%

22
Q

as the air cools the max water vapor contents

A

drop

23
Q

as the air reached the dew point

A

the air becomes fully saturated

24
Q

condensation-

A

water that had returned to a liquid state after being forced out the fully saturated air

25
Q

if the dew point occurs inside your wall you can run into some major issure : (4)

A

decay
mold
destruction
mayhem

26
Q

water vapor wants to achieve

A

equilibrium

27
Q

in gerneral what direction does water vapor more?

A

always moves from the warm side of an assmebly to the cold side of an assmebly

28
Q

water vapor moves through

A

creacks and holes
also through the assembly

29
Q

air retarder-

A

= building wrap=
a membran that is wrapped over the exterior wall of a building prior to installing the exterior wall clading to slow air diffusion

30
Q

what does the air retarted allow?

A

water vapor to freely pass thorugh

31
Q

what does the air retarder prevent?

A

the air and water from moving throught

must be sealed at joints

32
Q

vapor retarder-

A

a material of low permanence installed in a constructin to preent moisrute from entering and reaching a point where it can condense into a liquid

33
Q

the vapor retarders are normally placed

A

on the warm side of the construction in temperate of cold climates

in hot humid places they may have to move the retarder to the outside of the construction

34
Q

what are the 3 primary wats that rain water can enter the building:

A

gravity
surface tension
- capillary action
wind

35
Q

you must seal what to ensure water does not get within your buildin

A

JOINTS

  • sealants degrade over time and need to be replaced
36
Q

all horizontal planes are

A

sloped

37
Q

what is a typical roof or other large surface area for slope?

A

1/4” : 1’

38
Q

the drip edge, groove, or slot does what on the roof

A

overhangs

39
Q

how does surface tension force water into the bulding?

A

surface tension allows a thin film of water to travel horizontally along a soffit edge or the like

creates capillary forces

40
Q

how do you prevent surface tension from forcing water within the building?

A

include a capillary break at joints

seal any porous materials

41
Q

how does wind force water into a building?

A

wind forces impart kinetic energy

to prevent this provide overlap between members meeting at joints

us L or Z flashing

42
Q

what is a impervious wall?

A

EIFS - needs ongoing maintenance

43
Q

what is a mass wall?

A

a wall that sheds most rain at the exteiror face and absorbs the rest which is released as vapor as the wall dries out

moisture can occasionally get all the way thrrough

44
Q

what is a drainage wall?

A

a wall that utilizes a drainage plane or moisture barrier between the exterior classing and supporting wall for additional moisture resistance

45
Q

rainscreen is what?

A

a wall consisting of an outer layer of cladding, an air cavity, and a drainage palne with a rigid, water resistance, and airtight support system

46
Q

a good example of a simple rainscreen is

A

a veneer brick wall

lapped siding

47
Q

the air cavity is used for

A

water drainage but also air circulation

ARC 242 Woods tech (11 decks)

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