Masonry Flashcards
The standard measurement for a concrete block
8” x 8” x 16” ctr. to ctr. Actual is 7-5/8” x 15-5/8”
When estimating for block corners do what?
Subtract 1/2 the length of a standard block (8”).
Standard modular brick size
2-1/4” x 4” x 8” - when calculating wall thickness, take into account the air space (2”).
Grade SW Brick
Highly resistant to frost (foundation courses or retaining walls)
Grade MW Brick
Used where there is exposure to temperatures below freezing (face of a wall aboveground)
Garde NW Brick
backup on interior masonry
Type FBX Brick
Facing bricks - exposed exterior and interior walls and partitions where a high degree of perfection is required.
Modular Unit
4”
Standard Modular Brick Size is?
3-1/2” x 2-1/4” x 7-1/2”
What is the maximum height of grout lifts?
5’
What is a cavity or two-wythe wall?
A cavity wall is a two wythe wall that allows each wythe to react independently to stress. The gap is a continuous air space of at least 2”
Composite walls - when ties are used, at least one tie for ever 2-2/3sq.ft of wall is required for No. ____ ties.
No. 9
Regular ties in composite wall should be spaced no more than _____ horizontally and ___vertically.
36” horizontally
24” vertically
Veneered walls - metal tie size and spacing
22 gauge galv. Strips 7/8” wide and spaced 16” vertically and 32” horizontally
4” RBM Curtain vs Panel Wall
Curtain wall - must support their own weight for the height of the wall
Panel wall - supported at each story and self supporting between stories
Hallow masonry wall - what is the spandrel?
The space between the top of a window of one story to the sill of the window on the second story
Expansion Joint should be applied on a cavity wall on each side of an external corner where the walls are more than ____ in length
50’
Steel vs. Concrete Lintel Sizing
Steel lintels should extend 4” either side of the opening
Reinforced Concrete lintel should extend at least 8” either side of the opening
What thickness of mortar is needed when placing concrete on hardened concrete or existing rock?
1/2” - 1” thick
What is a travertine or keystone finish?
Applying a dash coat of mortar over freshly leveled concrete.
If a jack arch is over ______ ft. Wide it should be supported by steel at the opening.
2 feet
Which compacted mortar joint readily sheds water and just be worked from below?
Weathered
When corbeling for a masonry ledge or shelf, one is to begin the corbel course by projecting headers out ____ inch beyond the course below.
3/4”
What is the compressive strength for concrete block made of sand and gravel aggregate?
1,200 to 1,800 psi
What is the closest an adjustable ladder type brick should be from the edge of the brick?
5/8”
A _____ inch diameter bar is used for a standard concave mortar joint.
5/8”
Which type of hydrated lime is recommended for masonry mortar because of the control over unhydrated oxides and plasticity?
Type S
Which kind of masonry bond has a course of full length headers every fifth to seventh course?
Common or American Bond
________ on top of a masonry wall prevent moisture from entering the wall.
Stop Coping
What is the usual capacity of a mortar mixer?
4 cubic feet to 7 cubic feet
What is the name of an exterior non-load bearing wall that is supported at each story and is self-supporting between stories?
Panel Wall
Which type of mortar has a very low compressive bond strength and is best used for interior non-loadbearing interior walls?
Type K
How many cubic meters equal one cubic yard?
0.765
Masonry saw blades vary from _____ inches to ______ inches in diameter with a blade that is 1/8” thick.
6, 24
Which type of bond is made up of alternate courses of headers and stretchers?
English Bond
What is the shape of a block lintel or beam?
U
Which of the following exterior non-loading bearing walls is NOT supported at each story and can be anchored to both columns and spandrel beams?
Curtain
The simplest of the basic bonds and largely used in cavity wall and veneer wall construction and consists of all stretchers?
Running Bond
True or False, FTX unglazed facing tile is NOT suitable for general use in exposed interior masonry walls
True
Mortar should be both used and set in its final place within?
2.5 hours
Wall ties should be placed ____ inch from either edge of the masonry unit.
5/8”
What tool is used most often by a mason to cut brick?
A brick hammer
What type of joint does not allow for movement across the joint?
Construction
Under normal conditions, how many part(s) hydrochloric acid is permitted to be used with nine parts water for cleaning of dark brick?
One
Which joint is made by removing some of the mortar while it is still soft?
Raked
In masonry work, a _________ is used to finish long horizontal joints.
Sled runner
A control joint, a continuous vertical joint that has been built into a concrete masonry wall, should be raked out to a depth of ______ inches.
3/4”
The three face - adjacent is ________ a common fireplace design.
NOT
By volume, a portland cement/lime mortar mixture should include how many parts of lime?
1 Part
When required, masonry prism sampling is required for each _______ square feet of wall area in question.
5,000 SQFT
An expansion joint is to be provided in a brick wythe’s wall every ______ feet or more in length.
50 feet
