concrete, brick, plaster - book sec 16 Flashcards

1
Q

Why shall formwork for all slabs be set with a camber of 1/4 inch for each 10’ of span?

A

underside of the finished slab to be level.

camber - slightly convex or arched shape of a horizontal surface

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2
Q

cinder concrete is useful because

A

lightweight

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3
Q

cinder concrete

A

Cinder concrete slab construction, also known as cinder arches, “goulash” construction, or even “short span arch construction”, was a type of reinforced concrete slab system consisting of low strength concrete which used cinders as an economic substitute for stone aggregate and draped wire mesh as reinforcement.
(Structuremag.org)

portland-cement concrete in which clean well-burned coal cinders are used as coarse aggregate.
(merriam-webster.com)

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4
Q

the purpose of the crimp in a tie bar in a cavity wall is

A

prevent water from passing across the bar

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5
Q

SAND-LIME BRICKS

A

Sand-lime bricks are made out of sand, lime and water (no additives). By high pressing the mixture and autoclaving afterwards a firm white building material is produced. Good acoustic insulation, good heat & humidity accumulation as well as excellent fire resistance are the main parameters for architects to prescribe lime sand bricks for each building project.

Sand-lime brick is a precast building material that simultaneously provides structure, thermal insulation and sound insulation.

carmeuse-construction.com

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6
Q

cored brick - what is the minimum thickness between the core and the face of the brick

A

3/4”

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7
Q

1 gross

A

144

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8
Q

1 board foot

A

Timber cubic volume of 12”x 12” x 1”

To calculate,

T” x W” x L’ / 12

Or

T” x W” x L” / 144

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9
Q

cause of map cracking in the finish coat plaster

A

is a weak brown coat

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10
Q

lowest temp for plastering

A

50 F

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11
Q

Plaster of Paris

A

gaging plaster that is used to accelerate the setting time of finish coat plaster

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12
Q

Bond plaster

A

scratch coat, generally required to be mixed neat without the addition of sand

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13
Q

min temp for laying asphalt tile

A

70 F

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14
Q

turpentine

A

common paint thinner

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15
Q

splices in the steel columns of a tall steel frame building are usually located at

A

2’ above the floor

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16
Q

most important advantage in the use of steel shell piles is

A

the opportunity for better inspection

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17
Q

Engineering News Record formula for piles

P = 2Wh / s + c

A

W = weight of the hammer
h = height of fall of the hammer
S = average penetration of the last 5 blows in inches
C = a constant (1” drop hammer, 0.1” steam hammer)

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18
Q

Brickwork usually require special precautions and protection for work in cold weather - highest temperature below which are required?

A

40 F

19
Q

Brickwork - Efflorescence may be removed by washing with

A

Muriatic acid

20
Q

Construction joints in the concrete columns of a multistory building are usually located at

A

floor level

21
Q

rowlock course of bricks are laid

A

on their 2 1/4” x 8” surface

22
Q

lime to a mortar mix will increase

A

workability

23
Q

per M

A

per 1000

24
Q

how many pound of 16d nails are req’d for 1,000 SF of floor framing area

A

7-8 pounds

25
Q

typical thickness of a crushed-rock base course for asphalt paving is

A

5 inches

26
Q

air-conditioning calculation - loss factor used for the exposure of walls to common heated surfaces is

A

3.5

27
Q

How many linear feet of moldings, door and window trim, handrails etc can a carpenter install in a day?

A

250 linear feet

28
Q

typical reinforcing bar used for masonry walls

A

9

29
Q

how many stair treads with risers can a carpenter install in a day

A

15-18

30
Q

floor sheathing - what type of nails are used

A

8d

31
Q

how many hours to install and caulk a typical sliding shower door assembly?

A

4 hours

32
Q

how many exterior SF can a painter cover (primer+2 coats) in a day

A

500 SF

33
Q

how many SF of siding can be installed per day

A

250 SF

34
Q

how long does it take for a 2 person to install floor joists for a 100 SF area of floor space

A

3 hours

35
Q

Labor costs for a job will be about what % of the total job cost

A

15 %

36
Q

How many SF per gallon do most exterior paint cover

A

400 SF

37
Q

How many linear feet of drywall tape can be applied a day

A

250 LF

38
Q

How many rolls of wall covering does one gallon of prepared wallpaper paste cover

A

12 rolls

39
Q

what size is most wire used in residential work

A

12

40
Q

How long does fire-resistant floor required to extend from fireplace in most fire codes

A

12 inches

41
Q

what is the most commonly used size range for flashing and gutter sheet metal

A

22-26 gauge

42
Q

how many SF of interior wall space can one painter cover in an hour WITH brush

A

100 SF

43
Q

Most expensive caulking material out of Neoprene, Butyl, Polyurethane, Latex

A

Butyl

44
Q

Tank toilet - assembly that controls the water supply is

A

gating