Chapter 8 Flashcards
Which type of load bearing masonry wall will the firefighter most likely encounter
Concrete block
Which type of support is used only where architectural style makes it attractive
corbelling
What is the hardness of the brick dependent upon
Soil
Which is a beam over an opening in a masonry wall
Lintel
Which type of stone is NOT commonly used in stone masonry construction
Clay
What shape section above the lintel is it assumed will need to be supported by the lintel
Triangle
Which type of wall is built to prevent water seepage through the mortar joints to the interior of the building
Cavity wall
Which of the following is one of the oldest and simplest building materials
Masonry
How many layers of 1 inch (25 mm) matched boards are required in nonbearing interior partitions and walls of mill construction as a minimum
Two
What is the required fire resistance rating of exterior walls in heavy timber construction
2 hour
What is used to allow the beam to fall away freely from a wall in the case of structural collapse without pushing against the masonry
Fire cut
What would the allowable compressive strength of brick masonry be
250 psi (1.72 kPa)
Which direction should firefighters assume the collapsing masonry wall will fall
Outward
Where should corrosion-resistant metal ties be placed to accomplish horizontal bonding in a masonry wall
Between the wythes
What is usually the maximum height allowed for non reinforced masonry walls
six stories
What causes cracks and misalignment of masonry wall
shifting foundation
What must be done to the masonry wall as the height of the wall increases
Increase the thickness at the base
What may be used to reduce the compressive stresses in the masonry when a beam transmits a large vertical load
pilaster
Which determines the fire resistance of a masonry wall
Type of units used and thickness of the wall
Which is the traditional and most basic masonry structure
Exterior load bearing wall
What is a major advantage of mill construction from a fire fighting standpoint
No concealed spaces
Which part of the mortar serves as the bonding agent
Portland cement
Which is a low wall at the edge of the roof
parapet
How high will three courses of brick plus the intervening mortar joints be when completed
8 inches
Which is usually identifiable from the exterior of the building when a leaning or bulging masonry wall is repaired
Bearing plate
How often can a header course be placed to bond parallel wither of brick
Every sixth course
Which type of strength does a masonry unit have
Compressive
Which type of construction are buildings of ordinary construction with masonry exterior walls and wood joisted interior framing
Type 3
What usually collapses and results in the masonry wall collapsing
Interior wood framing
Which type of fascia creates a projection beyond the building wall that creates a concealed space through which a fire can communicate
Mansard
Which of the following can cause deterioration of a masonry structure
mortar breakdown
