FCC FCC Site Work & Foundation Systems 1 — Questions and Answers
Question 1: In Florida, why is soil bearing capacity especially important before designing a foundation?
- Florida's sandy and loose soils often have low bearing capacity, requiring engineered foundations (Correct answer)
- Florida soil is uniformly hard and needs no testing
- All Florida soil is classified as expansive clay
- Soil bearing capacity only matters for structures over 10 stories
Correct answer: Florida's sandy and loose soils often have low bearing capacity, requiring engineered foundations
Much of Florida consists of sandy, loose, or organically-rich soils with low bearing capacity, making geotechnical analysis critical for safe foundation design.
Question 2: Which type of foundation is most commonly used in Florida residential construction due to the state's soil conditions and high water table?
- Monolithic slab-on-grade (Correct answer)
- Full basement with waterproofing
- Crawl space with wood floor framing
- Driven steel H-piles
Correct answer: Monolithic slab-on-grade
Monolithic slab-on-grade foundations are dominant in Florida residential construction because they avoid basement flooding risks and are well-suited to flat, sandy terrain.
Question 3: What is the primary purpose of a geotechnical (soil) investigation before construction begins?
- To determine soil bearing capacity and identify subsurface conditions that affect foundation design (Correct answer)
- To check for buried utility lines only
- To measure topographic elevation only
- To test soil color and texture for landscaping purposes
Correct answer: To determine soil bearing capacity and identify subsurface conditions that affect foundation design
A geotechnical investigation provides data on soil strength, groundwater depth, and subsurface anomalies that are essential for selecting and designing a safe foundation system.
Question 4: What does 'compaction testing' on a construction site verify?
- That fill soils have been densified to the specified relative compaction percentage (Correct answer)
- That the concrete mix has the correct water-cement ratio
- That the site drainage slopes away from the building
- That the gravel base is the correct depth
Correct answer: That fill soils have been densified to the specified relative compaction percentage
Compaction testing using methods such as the Proctor test verifies that placed fill has been sufficiently densified to support loads without excessive settlement.
Question 5: In Florida, the minimum distance that finished floor elevation must be above the crown of the road or flood zone base flood elevation is governed by:
- Local floodplain management ordinances and FEMA flood zone requirements (Correct answer)
- Only the architect's preference
- The International Residential Code without local amendment
- OSHA site safety standards
Correct answer: Local floodplain management ordinances and FEMA flood zone requirements
Florida contractors must comply with local floodplain ordinances and FEMA NFIP requirements when setting finished floor elevations in flood-prone areas.
Question 6: Which term describes the process of removing unsuitable soil and replacing it with engineered fill material?
- Undercutting and backfilling (Correct answer)
- Dewatering
- Shoring
- Benching
Correct answer: Undercutting and backfilling
Undercutting removes weak, organic, or unsuitable soil, and engineered fill is then placed and compacted to provide a stable foundation subgrade.
FCC FCC Site Work & Foundation Systems 1
In Florida, why is soil bearing capacity especially important before designing a foundation?