COSC 253 EXAM 2 2025/2026 QUESTIONS
AND ANSWERS 100% PASS
Which division is Masonry? - ANS Division 4
Mortar - ANS binding agent between masonry units.
Four main ingredients in mortar: - ANS Portland Cement or Masonry Cement- bonding agent
in the mortar.
Hydrated Lime- makes the mortar smooth and workable.
Aggregate (Sand)- must be clean and sized properly.
Water- binds ingredients in the mortar.
What is grout? - ANS Grout is a filler. It is not considered a binding agent.
What do most architects require before the entire wall is constructed on a building? - ANS A
mock up
ASTM C270: Type M - ANS High strength mortar-structural walls; severe weather exposure,
below grade.
ASTM C270: Type S - ANS Medium strength mortar- structural walls; severe weather
exposure.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, ASTM C270: Type N - ANS Medium strength mortar- used for most purposes, above grade.
ASTM C270: Type O - ANS Medium or low strength- most economical; non-loadbearing
interior walls.
Portland cement- Lime mortar ingredients: - ANS Portland Cement- bonding agent in the
mortar.
Lime- makes the mortar smooth and workable.
Aggregate (Sand)- must be clean and sized properly.
Water- binds ingredients in the mortar.
Masonry cement mortar ingredients: - ANS Masonry Cement- bonding agent in the mortar.
Hydrated Lime- makes the mortar smooth and workable.
Aggregate (Sand)- must be clean and sized properly.
Water- binds ingredients in the mortar.
What is Tuck pointing? - ANS The refilling of an existing joint from which some of the mortar
has been removed.
What is flashing? - ANS A membrane that you add to protect a joint, typically from water.
Flashing material: - ANS Sheet metal, bituminous fabric membranes, plastic sheet materials,
or a combination of these materials.
Where is flashing installed? - ANS Flashing is installed at vulnerable locations in masonry;
thresholds of doors, 90 degree angles...
What are weep holes? - ANS Holes to let condensation out of the wall.
What are the 3 classifications of Clay Masonry Units? - ANS Solid Masonry Units
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
AND ANSWERS 100% PASS
Which division is Masonry? - ANS Division 4
Mortar - ANS binding agent between masonry units.
Four main ingredients in mortar: - ANS Portland Cement or Masonry Cement- bonding agent
in the mortar.
Hydrated Lime- makes the mortar smooth and workable.
Aggregate (Sand)- must be clean and sized properly.
Water- binds ingredients in the mortar.
What is grout? - ANS Grout is a filler. It is not considered a binding agent.
What do most architects require before the entire wall is constructed on a building? - ANS A
mock up
ASTM C270: Type M - ANS High strength mortar-structural walls; severe weather exposure,
below grade.
ASTM C270: Type S - ANS Medium strength mortar- structural walls; severe weather
exposure.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, ASTM C270: Type N - ANS Medium strength mortar- used for most purposes, above grade.
ASTM C270: Type O - ANS Medium or low strength- most economical; non-loadbearing
interior walls.
Portland cement- Lime mortar ingredients: - ANS Portland Cement- bonding agent in the
mortar.
Lime- makes the mortar smooth and workable.
Aggregate (Sand)- must be clean and sized properly.
Water- binds ingredients in the mortar.
Masonry cement mortar ingredients: - ANS Masonry Cement- bonding agent in the mortar.
Hydrated Lime- makes the mortar smooth and workable.
Aggregate (Sand)- must be clean and sized properly.
Water- binds ingredients in the mortar.
What is Tuck pointing? - ANS The refilling of an existing joint from which some of the mortar
has been removed.
What is flashing? - ANS A membrane that you add to protect a joint, typically from water.
Flashing material: - ANS Sheet metal, bituminous fabric membranes, plastic sheet materials,
or a combination of these materials.
Where is flashing installed? - ANS Flashing is installed at vulnerable locations in masonry;
thresholds of doors, 90 degree angles...
What are weep holes? - ANS Holes to let condensation out of the wall.
What are the 3 classifications of Clay Masonry Units? - ANS Solid Masonry Units
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
