Quality Control & Inspection Flashcards

After a heavy rain, a contractor notices water pooling along the inside base of a newly installed retaining fence. What is the likely QC deficiency?

Answer: Drainage provisions or weep holes specified in the design were omitted

Water pooling at a retaining fence base usually indicates that drainage provisions or weep holes required by design were not installed.

Which condition would cause a QC inspector to reject a batch of chain-link fence posts before installation?

Answer: Posts show through-wall pitting corrosion compromising wall thickness

Through-wall pitting corrosion reduces structural wall thickness below design requirements and is grounds for rejection; surface rust alone is typically acceptable.

A fence contractor uses 1-5/8 inch OD top rail on a project specified for 1-3/8 inch OD. The fence is already installed. What is the correct QC disposition?

Answer: Issue a non-conformance report and seek engineer or owner approval for the substitution

Any material substitution, even an apparently stronger one, requires a formal non-conformance report and documented owner or engineer approval before acceptance.

What is the correct method for verifying that concrete footings have achieved adequate cure strength before applying fence loads?

Answer: Waiting the specified cure time per mix design (typically 72 hours minimum for fence posts) or testing with a concrete maturity meter

Cure time per mix design or maturity testing ensures concrete has reached adequate strength; visual or informal tests are unreliable for structural confirmation.

An inspector discovers that a privacy fence's horizontal rails are bowing outward between posts by 1.5 inches at mid-span on a 6-foot panel. What is the most likely cause?

Answer: Rails are undersized for the span, or intermediate support is missing per design

Mid-span rail deflection indicates the rail section size is inadequate for the unsupported span, or required intermediate blocking or support was omitted.

Which action must a QC inspector take when discovering a fence installation encroaches 8 inches onto an adjacent property?

Answer: Stop work immediately, notify the project manager, and coordinate with the surveyor to resolve the encroachment before proceeding

A property encroachment is a legal issue requiring immediate work stoppage, notification up the chain of command, and survey resolution before any further installation.

What does a 'W' designation in the ASTM F1043 standard for fence framework indicate about a steel pipe or tube?

Answer: It meets the wall thickness requirement for the 'heavy industrial' strength group

In ASTM F1043, the 'W' strength group designates heavy industrial pipe/tube with greater wall thickness for demanding applications.