A crew removes low rafter ties and says high collar ties will do the same job. What force remains unresolved?
Correct Answer
A) Outward thrust.
Rafter ties resist outward thrust at the bearing walls; collar ties do not automatically replace that function.
Why This Is the Correct Answer
Rafter ties resist outward thrust at the bearing walls; collar ties do not automatically replace that function.
Why the Other Options Are Wrong
Option B: Water intrusion at the wall.
Water intrusion at the wall. addresses a neighboring field issue, but not the condition or method control required for roof framing.
Option C: Weak nailing base.
Weak nailing base. addresses a neighboring field issue, but not the condition or method control required for roof framing.
Option D: Whether the landing size complies.
Whether the landing size complies. addresses a neighboring field issue, but not the condition or method control required for roof framing.
Memory Technique
Roof Framing method for Checking Conventional: condition first, tool second.
Reference Hint
Study anchor (closed-book): memorize Roof framing from California Residential Code, California Code of Regulations Title 24. / Title 24 California Residential Code rafter ties and roof thrust; know the rule or calculation trigger without relying on exam-room lookup.
More Class B Trade Questions
A 2-inch horizontal sanitary branch must be installed at 1/4 inch fall per foot. What total fall is needed over a 24-foot run?
A 4-inch building drain is laid out with a required 1/8 inch fall per foot. What fall is required across 40 feet?
A rooftop unit schedule shows 3 tons of cooling. Using 12,000 Btu per hour per ton, what cooling capacity is this?
A pump motor is listed as 2 horsepower, and the coordination table asks for watts. Using 746 watts per horsepower, what is the approximate motor power?
A slab is 30 feet long, 18 feet wide, and 4 inches thick. How many cubic yards of concrete are needed before waste?
A footing is 80 feet long, 2 feet wide, and 12 inches deep. How many cubic yards of concrete are required before waste?
A patio subgrade must drain at 2 percent away from the building for 20 feet. What total drop is required?
A building pad needs 150 compacted cubic yards of fill. If the borrow material shrinks 10 percent after compaction, about how many loose cubic yards should be hauled in?
A roofing estimate shows 2,850 square feet of roof area. How many roofing squares is that?
A waterproof deck surface is 14 feet deep and must slope 1/4 inch per foot to the drain. What vertical fall is needed?