A hip roof differs from a gable roof in that the hip roof:
Correct Answer
B) Slopes on all four sides with no vertical end walls
Why this is correct: A hip roof is defined by having slopes on all four sides that meet at a ridge or peak. This design means there are no vertical gable end walls, which distinguishes it from a gable roof. Why the other choices are wrong: Has two flat triangular ends rising to a straight ridge is the definition of a gable roof. Cannot support composition shingles is false; hip roofs can support standard roofing materials. Requires no rafters or trusses is incorrect; all roofs require a structural support system. Exam tip: Visualize the shapes: Gable = triangle ends. Hip = all sides slope down from a point or ridge.
Why This Is the Correct Answer
Sloping on all four sides with no vertical end walls is the definition of a hip roof and the precise contrast with a gable. The absence of gable ends is the visual cue that identifies it from the street. That geometry explains the higher framing cost and the better wind performance, both of which follow from the shape rather than defining it. Correct identification matters because it drives the cost estimate and the improvement description.
Why the Other Options Are Wrong
Option A: Has two flat triangular ends rising to a straight ridge
Two flat triangular ends rising to a straight ridge describes a gable roof, which is the form being contrasted. The triangular end wall is the gable itself, and its presence is exactly what a hip roof lacks. The option is the definition of the other half of the comparison.
Option C: Cannot support composition shingles
Composition shingles are installed on hip roofs routinely, and roof shape does not determine material compatibility within normal pitch ranges. Very low slopes constrain material choice, but that is a pitch question rather than a shape question. Nothing about hip geometry excludes any common covering.
Option D: Requires no rafters or trusses
Every roof requires a structural support system, whether stick-framed rafters or engineered trusses, and hip roofs in fact require more framing members than comparable gables because of the hip rafters and jack rafters. The option states the opposite of the truth. No roof spans without structure.
Count the Slopes
Two slopes and two triangular walls is a gable. Four slopes and no triangular walls is a hip. Count the sloping planes from the corner of the lot and the identification is immediate.
How to use: For any roof identification item, count slopes and look for vertical triangular end walls. Then remember the consequences: hip costs more to frame and handles wind better; gable gives more attic volume.
Exam Tip
Roof shape questions on the national exam stay at the level of identification and its cost and utility implications. You are never asked to evaluate structural adequacy.
Common Mistakes to Avoid
- -Recording the wrong roof form and selecting a mismatched cost line item
- -Assuming roof shape limits covering material rather than pitch
- -Opining on structural adequacy rather than describing what was observed
Concept Deep Dive
Analysis
Roof shape is part of the improvement description and affects cost new, exposure to wind, attic configuration, and architectural style, so an appraiser should be able to identify the common forms on sight. A gable roof has two sloping planes meeting at a ridge, with vertical triangular walls, the gable ends, closing off the two remaining sides. A hip roof slopes on all four sides, with the planes meeting at a ridge in a rectangular building or at a single point in a square one, so no vertical triangular end walls exist. The difference has real consequences: hip roofs are more expensive to frame because of the additional hip rafters and compound cuts, they perform better in high winds because no flat vertical face catches the load, and they yield less usable attic volume than a gable of the same pitch. Other forms an appraiser meets include gambrel, mansard, shed, flat, and combinations, and the roof shape recorded should match the cost service line item selected in the cost approach.
Background Knowledge
You need the common residential roof forms, gable, hip, gambrel, mansard, shed, and flat, and the framing vocabulary of ridge, rafter, hip rafter, and truss. You should also know how roof shape affects cost new and attic utility, and that structural adequacy assessment lies outside appraisal competency.
Real-World Application
An appraiser describing a coastal ranch records a hip roof, selects the matching cost service entry, notes in her improvement description that the shape is favored locally for wind resistance, and observes that the attic offers only limited storage.
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