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Mississippi Residential Builder Practice Exam

What This Practice Exam Covers

The Mississippi Residential Builder licensing exam contains 80 questions answered within a 180-minute window. A score of 70% (56 correct) is required to pass. The exam spans 9 topic areas drawn from the IRC, OSHA 29 CFR 1926, the BCSI Guide, and supporting references on estimating, masonry, and concrete construction.

Two practice options are available here:

• Free practice exam: 10 questions per attempt, drawn from a limited pool. You can retake it as many times as you want to get comfortable with the question format and pacing. It costs nothing and requires no account.
• Full practice exam (paid): 80 questions, 180-minute time limit — structured exactly like the real exam. Questions are drawn from a pool of 649+ items, so each attempt is genuinely different. No two sittings will look identical. This is the tool for serious exam preparation.

Start with the free version to calibrate where you stand, then use the full exam for targeted, repeatable practice.

What You'll Be Tested On

Site Work, Footings, and Foundations — 13 Items

The heaviest foundation topic on the exam. You need to know how to size footings based on soil bearing capacity and the number of stories above, minimum footing depth requirements, and surface drainage/lot grading rules. Expect questions on presumptive soil load-bearing values from IRC Table R401.4.1 and how those values interact with footing width requirements in IRC Table R403.1(1). Foundation wall thickness minimums, waterproofing versus dampproofing distinctions (IRC Section R406.1), and crawl space requirements including the 8-inch wood-column-to-ground clearance (IRC Section R317.1, Item 1) are all tested. Know the difference between dampproofing and full waterproofing — the exam distinguishes them.

Concrete and Concrete Reinforcement — 8 Items

Questions here cover mix design fundamentals: water-cementitious materials ratio, aggregate types, admixtures, and supplementary cementitious materials. You must know what field control tests measure — slump for workability, air content testing, compressive strength cylinder procedures, and density/yield. Reinforcing bar identification markings (grade marks, line markings), concrete cover requirements, and placement tolerances are directly tested. Air entrainment questions focus on why it is used (freeze-thaw resistance) and recommended air content percentages for different exposure levels. Modern Masonry, Chapter 18, Section 18.1.4 covers the IRC code note on air entrainment specifically.

Masonry — 4 Items

Fewer questions, but they are specific. Know CMU, clay/shale, AAC, and stone unit standards. Mortar type proportions (Types M, S, N, O) and when each is appropriate are tested. Grout types (fine vs. coarse), minimum grout space dimensions, and lift/pour height limits appear here. Minimum nominal wall thickness requirements are a recurring question type (Modern Masonry, Page 248). Wall tie spacing in multiple-wythe construction and seismic reinforcement requirements round out this section.

Carpentry — 15 Items

The single largest topic on the exam. Floor joist allowable spans require you to read span tables based on species, grade, spacing, and load. Floor sheathing grades, span ratings, and nail schedules (IRC Table R602.3(1)) are tested. Wall framing questions cover stud size, height limits (IRC Section R602.3.2), and maximum spacing. Header and girder sizing for wall openings comes from IRC Table R602.7(1). Wall bracing methods — including braced wall panel types and minimum required bracing lengths from IRC Table R602.10.3(2) and Table R602.10.4 — are heavily tested. Cutting, notching, and drilling limits for joists and studs from IRC Sections R502.8.1 and R602.6 appear as calculation-style questions with specific fraction-of-depth limits.

Associated Trades and Drywall — 6 Items

Gypsum board thickness, fastener type, and fastener spacing for walls versus ceilings (IRC Section R702.2.1) are standard question formats. Know the rules for water-resistant gypsum backing board — where it is and is not permitted (IRC Section R702.4.2). Vapor retarder classes and which climate zone Mississippi falls into affect material selection answers. Exterior siding attachment and fastener requirements, including IRC Section R703.4 and R703.8, show up in questions about wind resistance and nail schedules.

Roofing — 7 Items

Minimum slope requirements for each roof covering type (asphalt shingles, clay/concrete tile, metal, slate, wood shakes/shingles) are directly tested — these are specific numbers you must memorize, not approximate. IRC Section R905.2.1 governs asphalt shingle slope minimums. Underlayment application and standards, flashing at valleys/chimneys/vertical surfaces (IRC Section R903.2.2), and fire classification (Class A, B, C per IRC Section R902.1) all appear. Fastener count and type for each covering type, and secondary overflow drain/scupper requirements from IRC Section R903.4.1, complete this section.

Estimating, Plan Reading, and General Code Requirements — 18 Items

The largest topic in raw item count. Expect arithmetic questions involving labor costs, overhead, markup, and bid preparation. Permit application procedures, exemptions from permit requirements (IRC Section R105.2), permit validity and extensions (IRC R105.5), and building official authority (IRC Sections R104.1, R104.10, R104.11) are all tested. Minimum room dimensions, ceiling heights, and habitable space definitions (IRC Section R202) are straightforward memorization. Structural load types — dead, live, wind, seismic — and where to find design values in IRC Table R301.5 require you to know the category, not just the name.

OSHA Safety — 5 Items

Fall protection trigger heights for residential construction (6-foot threshold per 29 CFR 1926, §1926.501(b)(13) and §1926.501(b)(4)(i)) are the most-tested OSHA item. Personal fall arrest system anchorage strength requirements appear in 29 CFR 1926, §1926.502(d)(15). Guardrail height and load requirements (29 CFR 1926, §1926.502(b)(3)), competent person responsibilities, and first aid/medical requirements (29 CFR 1926, §1926.50(c)) round out this section.

Licensing — 4 Items

Straightforward but easy to overlook. Know permit application requirements (IRC R105.3), work exempt from permits (IRC R105.2), certificate of occupancy requirements and revocation procedures (IRC Sections R109.1.6, R110.1, R110.3), and building official enforcement authority.

Worked Sample Questions

Question 1 — Estimating

A laborer earns $22/hour, works 12-hour shifts, 6 days per week. What is the weekly gross pay?

• A. $1,452
• B. $1,584
• C. $1,584
• D. $1,716

Correct Answer: B

Multiply hours per day by days per week: 12 × 6 = 72 total hours. Multiply by the hourly rate: 72 × $22 = $1,584. This is a straightforward gross pay calculation with no overtime adjustments — the question asks for gross pay at a flat rate. Options A and D are traps for candidates who miscalculate total hours (66 hours and 78 hours respectively).

Question 2 — Carpentry

When a rafter or roof truss is toe-nailed to a wall top plate, what is the correct nailing pattern?

• A. One toe nail on each side of the rafter or truss
• B. Three toe nails on one side of the rafter or truss
• C. Two toe nails on each side of the rafter or truss
• D. Two toe nails on one side and one toe nail on the opposite side

Correct Answer: D

IRC Table R602.3(1), Item 6 specifies the connection of rafters or roof trusses to the top plate: 2 toe nails on one side and 1 toe nail on the opposite side. Option C (two on each side) is a common wrong answer — it sounds symmetric and reasonable but exceeds what the table requires. Candidates who have not drilled the actual table numbers confuse this pattern regularly.
Source: International Residential Code, Table R602.3(1), Page 202

Question 3 — Site Work, Footings, and Foundations

In crawl spaces or unexcavated areas within the building foundation perimeter, wood columns require decay protection when they are closer than ______ to exposed ground.

• A. 6 inches
• B. 8 inches
• C. 12 inches
• D. 18 inches

Correct Answer: B

IRC Section R317.1, Item 1 sets the clearance threshold for wood columns at 8 inches from exposed ground. Many candidates mix up the three different clearances: 8 inches applies to columns, 12 inches applies to girders, and 18 inches applies to floor joists. All three numbers appear as answer options in various forms — knowing which member gets which clearance is essential.
Source: International Residential Code, Section R317.1, Item 1, Page 106

How to Read Your Score

The passing threshold is 70% — 56 correct out of 80 questions. On a first practice attempt, your score is a diagnostic, not a verdict. Most candidates who have not studied recently score in the 50–65% range on a first full attempt, which is normal and correctable.

Use your topic-by-topic breakdown to direct your study time. If you scored under 60% on Carpentry (15 items) or Estimating, Plan Reading, and General Code Requirements (18 items), those two areas alone represent more than 40% of your exam — fixing them moves the needle fast. If your OSHA or Licensing scores are low, those are smaller sections but the questions are more predictable, meaning a short focused review can lock in points quickly.

Scoring 70–74% on a practice exam is not a comfortable margin. Exam conditions, unfamiliar question wording, and time pressure all tend to lower real scores slightly compared to practice. Aim for consistent 78%+ on full practice attempts before scheduling the real exam. Retake the full practice exam multiple times — the 649+ question pool ensures you are seeing fresh material each time, not memorizing a fixed set of answers.

Where Candidates Lose Points

Carpentry span and nailing table errors cost more points than any other single cause. Candidates who know the concept but cannot locate the right table column — wrong species, wrong load assumption, wrong spacing — pick wrong answers on questions they should get right.

Footing size calculations in Site Work, Footings, and Foundations require candidates to match soil bearing capacity to the correct row and column in IRC Table R403.1(1). Misreading the number of stories or using the wrong soil class shifts the answer by one or two options.

OSHA trigger heights trip up candidates who apply the 4-foot general industry standard instead of the 6-foot residential construction threshold from 29 CFR 1926, §1926.501(b)(4)(i).

Roofing slope minimums are memorization questions with no formula. Candidates who only know "low slope" vs. "steep slope" generically cannot distinguish asphalt shingle from wood shake minimums — and the exam tests exactly that distinction.

Multi-step estimating problems cause time loss. A labor burden or markup question that requires three arithmetic steps takes 3–4 minutes if you are not practiced. With 80 questions in 180 minutes, you average 2.25 minutes per question — a hard question in Estimating can eat your buffer for easier questions later.

Decay protection clearances in Site Work are a predictable trap. The 8-inch/12-inch/18-inch values for columns, girders, and joists respectively appear in multiple question forms. Knowing one number is not enough.

Exam Quick Facts