CMT Exam 3 with all Correct & 100% Verified Answers |
Latest Version |Already Graded A+
To prevent the sill plate from coming in direct contact with the foundation, and to seal any small
gaps ✔Correct Answer-a sill sealer
The entire construction of the floor frame at the top of the foundation is called sill construction
or ✔Correct Answer-box sill. The box sill is made up of the sill sealer, sill plate, joist, and joist
header or rim board
This is a compressible, fibrous material that acts like a gasket in the sill construction. All lumber
in contact with the foundation ✔Correct Answer-including the sill plate, must be pressure
treated (PT) with an approved chemical to prevent decay.
Floor joists are the parallel framing members that make up most of the floor framing.
✔Correct Answer-Until recently, joists in residential construction were 2-inch framing lumber.
However, recent advances in the use of materials have produced several types of engineered
joists
common type of engineered wood joists is the I-joist, consisting of a top and bottom rib of solid
wood and a thinner plywood web between ✔Correct Answer-the ribs. I-joists are often called
TJIs because the first I-joists, introduced over 40 years ago, were named after the Trus Joist
Institute, which developed the first I-joists.
Although the materials in each type are different, their use is essentially the same. The joist
header in each case is of similar material to the joist. When I-joists are used the header is
typically ✔Correct Answer-an engineered rim board that is manufactured to have the same
depth as the I-joists
When I-joists are used for floor framing, ✔Correct Answer-, the joist header is usually an
engineered rim board.
I-joists are becoming increasingly popular for use as floor and ceiling joists because ✔Correct
Answer-hey are lighter than dimensional lumber, are available in greater lengths, and are
dimensionally stable. They do not expand and contract or warp nearly as much as conventional
lumber with changes in moisture content. They are lighter than dimensional lumber because
they use far less material. Weighing less, they require less fuel to transport. Being more
dimensionally stable, they are less apt to cause weaknesses in the structure or openings for air
infiltration.
Metal floor joists are often used in commercial and industrial construction. Where nonmetallic-
sheathed cable is installed through metal studs or floor joists, a bushing or grommet must be
, installed prior to installing the cable ✔Correct Answer-For example, notes on the foundation
plan give the information for the first floor framing. When the arrangement of framing members
is complicated, a framing plan may be included (see Figure 17-7). On most framing plans, each
member is represented by a single line.
In the simplest building, all joists run in the same direction and are supported between the
foundation walls by a single girder. ✔Correct Answer-However, irregularities in building
shapes require that joists run in different directions (see Figure 17-8). As the building design
becomes more complex, more variations in floor framing are necessary. In a building such as the
Lake House, which has floors at varying levels, the joists are supported by a combination of
girders, beams, and load-bearing walls.
The floor framing in the Lake House can be studied most easily if it is viewed as having four
parts: the kitchen, bedroom #1, bedroom #2 and bathrooms, and the loft. There is no floor
framing for the living room and dining room. ✔Correct Answer-These two areas form the heat
sink for the passive-solar features discussed in earlier units. The floors in these rooms are
concrete to absorb and radiate solar heat. As each area is framed, the carpenter must identify
the following:
Joist headers (locate the outer ends of joists)
Bearing for inner ends of joists (beams, walls, etc.)
Size and type of framing materials
Length of joists
Spacing
Framing at openings
The joist headers are easily identified on the framing plan, but their exact position should be
checked on the detail drawings. ✔Correct Answer-They may be set back to create a brick
ledge, to accommodate wall finish, or to be flush with the foundation (see Figure 17-10).
The bearing (support) for the inner ends of some of the joists in the Lake House is the
structural-steel-and-LVL-beam core, Detail 5/6. This core consists of four 1½-inch square steel
posts with LVL beams and steel-channel beams. The positions of the posts are shown on all plan
views of the house ✔Correct Answer-. The C8 × 11.5 steel acts as a beam to support the floor
in bedroom #2. The doubled smaller LVLs support the loft. The LVL beams form part of the roof
framing. All of the LVL beams rest in beam pockets that are welded to the posts. The structural
steel channel (C8 × 11.5) is bolted directly to the posts.
Cantilevered framing consists of joists that project beyond the bearing surface to create a wide
overhang ✔Correct Answer-This technique is used extensively for balconies, under bay
windows, and for garrison-style houses (see Figure 17-13).
Figure17-13.
Where stairs and chimneys pass through the floor frame, some of the joists must be cut out to
form an opening. The ends of these joists are supported by headers made of two or more
Latest Version |Already Graded A+
To prevent the sill plate from coming in direct contact with the foundation, and to seal any small
gaps ✔Correct Answer-a sill sealer
The entire construction of the floor frame at the top of the foundation is called sill construction
or ✔Correct Answer-box sill. The box sill is made up of the sill sealer, sill plate, joist, and joist
header or rim board
This is a compressible, fibrous material that acts like a gasket in the sill construction. All lumber
in contact with the foundation ✔Correct Answer-including the sill plate, must be pressure
treated (PT) with an approved chemical to prevent decay.
Floor joists are the parallel framing members that make up most of the floor framing.
✔Correct Answer-Until recently, joists in residential construction were 2-inch framing lumber.
However, recent advances in the use of materials have produced several types of engineered
joists
common type of engineered wood joists is the I-joist, consisting of a top and bottom rib of solid
wood and a thinner plywood web between ✔Correct Answer-the ribs. I-joists are often called
TJIs because the first I-joists, introduced over 40 years ago, were named after the Trus Joist
Institute, which developed the first I-joists.
Although the materials in each type are different, their use is essentially the same. The joist
header in each case is of similar material to the joist. When I-joists are used the header is
typically ✔Correct Answer-an engineered rim board that is manufactured to have the same
depth as the I-joists
When I-joists are used for floor framing, ✔Correct Answer-, the joist header is usually an
engineered rim board.
I-joists are becoming increasingly popular for use as floor and ceiling joists because ✔Correct
Answer-hey are lighter than dimensional lumber, are available in greater lengths, and are
dimensionally stable. They do not expand and contract or warp nearly as much as conventional
lumber with changes in moisture content. They are lighter than dimensional lumber because
they use far less material. Weighing less, they require less fuel to transport. Being more
dimensionally stable, they are less apt to cause weaknesses in the structure or openings for air
infiltration.
Metal floor joists are often used in commercial and industrial construction. Where nonmetallic-
sheathed cable is installed through metal studs or floor joists, a bushing or grommet must be
, installed prior to installing the cable ✔Correct Answer-For example, notes on the foundation
plan give the information for the first floor framing. When the arrangement of framing members
is complicated, a framing plan may be included (see Figure 17-7). On most framing plans, each
member is represented by a single line.
In the simplest building, all joists run in the same direction and are supported between the
foundation walls by a single girder. ✔Correct Answer-However, irregularities in building
shapes require that joists run in different directions (see Figure 17-8). As the building design
becomes more complex, more variations in floor framing are necessary. In a building such as the
Lake House, which has floors at varying levels, the joists are supported by a combination of
girders, beams, and load-bearing walls.
The floor framing in the Lake House can be studied most easily if it is viewed as having four
parts: the kitchen, bedroom #1, bedroom #2 and bathrooms, and the loft. There is no floor
framing for the living room and dining room. ✔Correct Answer-These two areas form the heat
sink for the passive-solar features discussed in earlier units. The floors in these rooms are
concrete to absorb and radiate solar heat. As each area is framed, the carpenter must identify
the following:
Joist headers (locate the outer ends of joists)
Bearing for inner ends of joists (beams, walls, etc.)
Size and type of framing materials
Length of joists
Spacing
Framing at openings
The joist headers are easily identified on the framing plan, but their exact position should be
checked on the detail drawings. ✔Correct Answer-They may be set back to create a brick
ledge, to accommodate wall finish, or to be flush with the foundation (see Figure 17-10).
The bearing (support) for the inner ends of some of the joists in the Lake House is the
structural-steel-and-LVL-beam core, Detail 5/6. This core consists of four 1½-inch square steel
posts with LVL beams and steel-channel beams. The positions of the posts are shown on all plan
views of the house ✔Correct Answer-. The C8 × 11.5 steel acts as a beam to support the floor
in bedroom #2. The doubled smaller LVLs support the loft. The LVL beams form part of the roof
framing. All of the LVL beams rest in beam pockets that are welded to the posts. The structural
steel channel (C8 × 11.5) is bolted directly to the posts.
Cantilevered framing consists of joists that project beyond the bearing surface to create a wide
overhang ✔Correct Answer-This technique is used extensively for balconies, under bay
windows, and for garrison-style houses (see Figure 17-13).
Figure17-13.
Where stairs and chimneys pass through the floor frame, some of the joists must be cut out to
form an opening. The ends of these joists are supported by headers made of two or more
