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Property DescriptionMEDIUM11.8% of exam

Drawings show horizontal floor beams supported by discrete vertical piers rather than a continuous perimeter bearing wall. Which listed label best describes this support arrangement?

Correct Answer

C) Pier and beam foundation

Horizontal beams resting on separate vertical piers describe a pier-and-beam foundation. A mat or slab spreads loads through a continuous concrete element, and a basement uses continuous foundation walls. Pier depth and bearing depend on the actual design and soils.

Answer Options
A
Mat (raft) foundation
B
Slab-on-grade foundation
C
Pier and beam foundation
D
Full basement foundation

Why This Is the Correct Answer

Option C is correct because horizontal floor beams resting on separate vertical piers describe a pier-and-beam foundation. The loads are carried at individual points rather than through a continuous perimeter bearing wall or a continuous slab. Pier depth and bearing depend on the actual design and soils.

Why the Other Options Are Wrong

Option A: Mat (raft) foundation

Option A, a mat (raft) foundation, spreads building loads through a single continuous concrete element under the structure. That is the opposite of support at discrete piers.

Option B: Slab-on-grade foundation

Option B, a slab-on-grade foundation, is a continuous concrete slab placed at ground level that spreads loads over the slab. It does not use beams supported on separate vertical piers.

Option D: Full basement foundation

Option D, a full basement foundation, uses continuous foundation walls enclosing a below-grade space. The stem specifically says there is no continuous perimeter bearing wall, which rules out a basement.

Points versus continuous support

Piers carry loads at points; slabs, mats and basement walls carry loads continuously. If the description says discrete piers, think pier and beam.

How to use: Use this when a question describes how loads are supported rather than naming the foundation.

Exam Tip

Read the support description literally. The words discrete vertical piers and no continuous bearing wall point to pier and beam.

Common Mistakes to Avoid

  • -Confusing a crawl-space pier system with a slab-on-grade
  • -Calling any raised floor a basement
  • -Assuming pier depth without reviewing the actual design

Concept Deep Dive

Analysis

This question tests recognition of foundation types from a description of how loads are carried. The clue is horizontal beams resting on discrete vertical piers instead of a continuous wall or a continuous concrete element. That support arrangement is the defining feature of a pier-and-beam foundation.

Background Knowledge

Foundations transfer building loads to the soil, either through continuous elements such as slabs, mats and foundation walls or through discrete supports such as piers. A pier-and-beam system raises the floor on beams carried by individual piers, often creating a crawl space. Appraisers identify foundation type because it affects condition analysis, functional utility and comparability.

Real-World Application

An appraiser inspecting an older home notices the floor system sits on wood beams carried by masonry piers over a crawl space. The appraiser reports the foundation as pier and beam and notes any visible settling or moisture concerns. Comparable selection then considers whether buyers in the area treat crawl-space homes differently from slab homes.

pier and beamfoundationslab-on-grademat foundationcrawl space
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