90 Hour Course - Roofing Practice Exam
Questions and Answers Latest Versions
2026
What is the purpose of a roof truss system?
A triangular structure used to support a roof
Which is a member of a truss system?
Web
Name 2 engineered wood products that may replace conventional
joists.
Trusses, Wood l-joists
What are 2 possible joist hanger problems?
Undersized, inadequate nails
How does leger board support joists?
is fastened to the beam near the bottom and the joist rests on the top
of the ledger board.
Roof decking could be a minimum ____ if rafters are 16 inches on
center:
3/8 inch plywood if we assume the rafter are spaced 16 inches on
center.
In both plank and panel roof sheathing, vertical joints should not run
continuously up one rafter or one truss. Adjacent vertical joints
should be staggered. Explain why.
, The roof is stronger if vertical joints are staggered. Vertical joints are
weaknesses in the roof panel. Lining up all the weakness will tend to
make the roof act as several smaller panels rather than one large one.
How might you tell the difference between roof sheathing sag and
rafter sag from exterior of the house?
Sagging Rafters cause a dishing in the entire roof surface and/or sag at
the ridge. Sheathing sag is a repetitive pattern across the roof between
rafters, trusses, or roof joists.
Where is rust most likely to be found on a steel beam?
The end
How may steel columns be fastened to steel beams?
Bolts, welding, bendable tabs
Steel or wood beams should rest on flat, full width bearing surfaces.
True
Anything that restricts the drainage of water is a vulnerable area. Give
two examples:
Wide Chimneys near the lower edge of the roof and skylights.
What is the purpose of "cutting the points"?
This helps prevent water running along the top edges of shingles from
the sides of the valley into the roofing system.
The implications of missing drip edge flashings are _____.
Rot in the fascia.
A common problem with skylights in cold climates is ____.
Ice dams
Questions and Answers Latest Versions
2026
What is the purpose of a roof truss system?
A triangular structure used to support a roof
Which is a member of a truss system?
Web
Name 2 engineered wood products that may replace conventional
joists.
Trusses, Wood l-joists
What are 2 possible joist hanger problems?
Undersized, inadequate nails
How does leger board support joists?
is fastened to the beam near the bottom and the joist rests on the top
of the ledger board.
Roof decking could be a minimum ____ if rafters are 16 inches on
center:
3/8 inch plywood if we assume the rafter are spaced 16 inches on
center.
In both plank and panel roof sheathing, vertical joints should not run
continuously up one rafter or one truss. Adjacent vertical joints
should be staggered. Explain why.
, The roof is stronger if vertical joints are staggered. Vertical joints are
weaknesses in the roof panel. Lining up all the weakness will tend to
make the roof act as several smaller panels rather than one large one.
How might you tell the difference between roof sheathing sag and
rafter sag from exterior of the house?
Sagging Rafters cause a dishing in the entire roof surface and/or sag at
the ridge. Sheathing sag is a repetitive pattern across the roof between
rafters, trusses, or roof joists.
Where is rust most likely to be found on a steel beam?
The end
How may steel columns be fastened to steel beams?
Bolts, welding, bendable tabs
Steel or wood beams should rest on flat, full width bearing surfaces.
True
Anything that restricts the drainage of water is a vulnerable area. Give
two examples:
Wide Chimneys near the lower edge of the roof and skylights.
What is the purpose of "cutting the points"?
This helps prevent water running along the top edges of shingles from
the sides of the valley into the roofing system.
The implications of missing drip edge flashings are _____.
Rot in the fascia.
A common problem with skylights in cold climates is ____.
Ice dams
