For an ordinary slab-on-grade design without special frost or expansive-soil engineering, which listed setting presents the fewest of those specific concerns?
Correct Answer
D) Areas with stable soils and mild climates
Stable soils and mild climate present fewer of the stated frost and shrink-swell concerns for this ordinary design. That does not establish complete suitability without site-specific design and drainage information. Engineered slabs can be used in other conditions, including cold climates with appropriate frost protection. A slab does not itself provide basement storage; the foundation label alone does not establish moisture or structural performance.
Why This Is the Correct Answer
Option D is correct because stable soils limit shrink-swell movement and a mild climate limits frost concerns, which are the specific issues named for an ordinary slab design. That comparison does not by itself prove complete suitability, since site-specific design and drainage still matter. Among the listed settings, it presents the fewest of the stated concerns.
Why the Other Options Are Wrong
Option A: Areas requiring extensive basement storage
Option A, areas requiring extensive basement storage, is wrong because a slab-on-grade does not provide a basement, so it does not meet that storage need. This setting is about a functional mismatch, not a lack of soil or frost concerns.
Option B: Areas with expansive clay soils
Option B, areas with expansive clay soils, is wrong because expansive clays swell and shrink with moisture changes and can move a slab, which is one of the specific concerns the question names. Foundations in such soils require special design.
Option C: Areas with high water tables
Option C, areas with high water tables, is wrong because high groundwater can create moisture and soil-support problems for a slab placed at grade, so this setting presents more concerns than stable, dry conditions.
Slab likes stable and mild
An ordinary slab sits right on the ground, so it does best where the ground does not swell, heave with frost or stay wet.
How to use: Use this to rank settings for ordinary slab foundations in soil and climate questions.
Exam Tip
Note the qualifier 'ordinary slab without special engineering'; engineered slabs can work elsewhere, so do not reject them in every difficult setting.
Common Mistakes to Avoid
- -Assuming a slab provides basement storage space
- -Believing slabs cannot be used in cold climates even with frost protection
- -Treating a foundation label alone as proof of structural or moisture performance
Concept Deep Dive
Analysis
This question tests which site conditions raise frost and expansive-soil concerns for an ordinary slab-on-grade foundation. Expansive clays, high water tables and cold climates can create problems for a slab without special engineering. The setting with stable soils and a mild climate presents the fewest of those specific concerns.
Background Knowledge
A slab-on-grade foundation is a concrete slab placed directly on prepared ground. Its performance depends on soil stability, moisture, drainage and frost protection. Engineered slabs can be built in difficult conditions, but an ordinary design is best matched to stable soils and mild climates.
Real-World Application
An appraiser in a region with expansive clay notices diagonal cracks in the drywall and a sloping floor in a slab-on-grade house. The appraiser reports the observed conditions and recommends a structural inspection rather than assuming the slab is sound.
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