CARPENTRY LEVEL 2
What are the two most common sizes of material used in the construction of wood trusses?
- ANSWERS-2x4 (38mm x 89mm) 2x6 (38mm x 140mm)
How are truss connector plates attached to the truss members? - ANSWERS-They are either
pressed or rolled into place by means of a large hydraulic presses that exert well in excess of
1000lbs per square inch. Most presses exert 60 tons in capacity
Which truss design is prone to horizontal deflection as well as to vertical deflection? -
ANSWERS-The scissor truss
A roof with a single slope (shed roof) is built using which type of truss - ANSWERS-A mono
truss is for single slope applications
What are the names of the two styles of flat roof trusses? - ANSWERS-The Pratt and the
Warren
When would you use a combination truss? - ANSWERS-When you want a roof with two
different exterior slopes and two different interior slopes
Why should connector plates not be installed with a hammer? - ANSWERS-Do not develop
the resistance ( or solid anchorage) for which they are designed. The resistance can only be
achieved when the plated are pressed into the lumber
What is a girder truss? - ANSWERS-a girder truss is comprised of two, three or more trusses
laminated together to form a single truss capable of transferring much greater loads than a
single truss
Loads can be divided in two groups. What are they? - ANSWERS-Live loads and dead loads
, Where can the instructions for the proper lamination of a girder truss be found? - ANSWERS-
Instructions fro lamination should be sent out with the shipment and will be included with
truss documentation
Which type of load is a layer of roofing plywood attached to the trusses? - ANSWERS-dead
load
Which type of load is a pile of roofing plywood placed on the roof trusses prior to
installation? - ANSWERS-live load
What is a point load? - ANSWERS-A point load is a concentration of loading in one area of a
building or roof. An air conditioning unit would be a point load on a roof
What is the main purpose of ceiling joists? - ANSWERS-Ceiling joists tie the exterior walls
together
How should ceiling joists be fastened to wall plates? - ANSWERS-The ceiling joists must be
toenailed to the wall plate with two 82mm (3 1/4") long nails
Identify 3 ways in which ceiling joists can meet on top of interior bearing wall? - ANSWERS-1.
Butted and cleated together
2. Lapped
3. Lapped with blocking between them that is the same thickness as the rafters
How is joist layout affected when joists are lapped over an interior wall? - ANSWERS-The
layout on one exterior wall will be offset by the thickness of the ceiling joists
What must be done to the outside ends of ceiling joists? - ANSWERS-The joists need an
angled cut that matches the roof slope
What are the two most common sizes of material used in the construction of wood trusses?
- ANSWERS-2x4 (38mm x 89mm) 2x6 (38mm x 140mm)
How are truss connector plates attached to the truss members? - ANSWERS-They are either
pressed or rolled into place by means of a large hydraulic presses that exert well in excess of
1000lbs per square inch. Most presses exert 60 tons in capacity
Which truss design is prone to horizontal deflection as well as to vertical deflection? -
ANSWERS-The scissor truss
A roof with a single slope (shed roof) is built using which type of truss - ANSWERS-A mono
truss is for single slope applications
What are the names of the two styles of flat roof trusses? - ANSWERS-The Pratt and the
Warren
When would you use a combination truss? - ANSWERS-When you want a roof with two
different exterior slopes and two different interior slopes
Why should connector plates not be installed with a hammer? - ANSWERS-Do not develop
the resistance ( or solid anchorage) for which they are designed. The resistance can only be
achieved when the plated are pressed into the lumber
What is a girder truss? - ANSWERS-a girder truss is comprised of two, three or more trusses
laminated together to form a single truss capable of transferring much greater loads than a
single truss
Loads can be divided in two groups. What are they? - ANSWERS-Live loads and dead loads
, Where can the instructions for the proper lamination of a girder truss be found? - ANSWERS-
Instructions fro lamination should be sent out with the shipment and will be included with
truss documentation
Which type of load is a layer of roofing plywood attached to the trusses? - ANSWERS-dead
load
Which type of load is a pile of roofing plywood placed on the roof trusses prior to
installation? - ANSWERS-live load
What is a point load? - ANSWERS-A point load is a concentration of loading in one area of a
building or roof. An air conditioning unit would be a point load on a roof
What is the main purpose of ceiling joists? - ANSWERS-Ceiling joists tie the exterior walls
together
How should ceiling joists be fastened to wall plates? - ANSWERS-The ceiling joists must be
toenailed to the wall plate with two 82mm (3 1/4") long nails
Identify 3 ways in which ceiling joists can meet on top of interior bearing wall? - ANSWERS-1.
Butted and cleated together
2. Lapped
3. Lapped with blocking between them that is the same thickness as the rafters
How is joist layout affected when joists are lapped over an interior wall? - ANSWERS-The
layout on one exterior wall will be offset by the thickness of the ceiling joists
What must be done to the outside ends of ceiling joists? - ANSWERS-The joists need an
angled cut that matches the roof slope
