Quality Control & Inspection Flashcards

A quality control issue arises when a homeowner reports condensation forming inside double-pane windows on a newly completed home. The most likely cause is:

Answer: Failed insulated glass unit (IGU) seals allowing moisture between panes

Condensation between panes of an insulated glass unit indicates seal failure, which compromises the insulating gas fill and reduces the window's thermal performance.

A residential contractor uses a quality control hold point before pouring a concrete foundation. What work must be verified BEFORE concrete placement begins?

Answer: Reinforcing steel placement, form dimensions, and required inspections passed

Critical pre-pour items include verifying rebar size, spacing, cover clearances, form dimensions, and obtaining the required building department foundation inspection approval.

What is the purpose of a 'special inspection' as referenced in the IBC and IRC for certain residential projects?

Answer: Third-party inspection of high-risk construction elements required by the engineer or code

Special inspections are continuous or periodic inspections by an approved inspector for specified structural work such as high-strength concrete, masonry, or soils to verify conformance with approved plans.

A quality control review of a residential staircase finds the handrail graspability does not meet code. Which handrail profile is generally required by the IRC for a graspable handrail?

Answer: A circular cross-section with 1.25 to 2 inch outside diameter, or a Type II graspable profile

IRC Section R311.7.8.3 requires handrails to be graspable with a circular cross-section of 1-1/4 to 2 inches diameter or a non-circular Type II profile meeting specific grip dimensions.

During a quality inspection of a residential deck, the inspector finds that ledger bolts are installed in a single row. The correct installation per the IRC requires:

Answer: Two staggered rows of bolts to distribute loads and prevent splitting

IRC Table R507.9.1.3(1) requires ledger bolts to be staggered in two rows to distribute shear loads and reduce the risk of splitting the ledger board.

A contractor's quality management plan should include a non-conformance report (NCR) process. What is the primary purpose of an NCR?

Answer: To document deviations from contract requirements and track corrective actions to closure

An NCR formally documents a deficiency, identifies its root cause, specifies the required corrective action, and tracks resolution to ensure the issue is properly closed out.

What is 'substantial completion' and why is it significant in residential construction quality control?

Answer: The stage when the work is sufficiently complete for its intended use, triggering final payment obligations and warranty periods

Substantial completion is a contractual milestone when the owner can occupy and use the project for its intended purpose, triggering the final payment process, warranty start dates, and punch list resolution period.