A contractor is building a residence 200 feet from the ocean on Maui. During construction, the building inspector requires additional corrosion protection. What is the most appropriate rebar specification?
Correct Answer
B) Epoxy-coated rebar
Epoxy-coated rebar is the standard requirement for coastal construction in Hawaii, providing excellent corrosion resistance while being cost-effective compared to stainless steel.
Why This Is the Correct Answer
The correct answer is epoxy-coated rebar. Epoxy-coated rebar is the standard code-required specification for coastal construction in Hawaii. The epoxy coating acts as a physical barrier preventing chloride ions from reaching the steel surface, dramatically slowing corrosion. It provides an excellent balance of corrosion protection and cost-effectiveness, making it the practical standard for coastal residential construction.
Why the Other Options Are Wrong
Option A: Standard Grade 60 steel
Standard Grade 60 steel offers no additional corrosion protection beyond the concrete cover itself. In a coastal location 200 feet from the ocean, salt spray and chloride-laden groundwater will penetrate the concrete and attack uncoated steel within years, causing expansive corrosion that cracks the concrete and compromises structural integrity.
Option C: Stainless steel rebar
Stainless steel rebar provides superior corrosion resistance — arguably better than epoxy-coated rebar — but at a cost roughly 8 to 10 times higher than standard rebar. For a residential project, stainless steel is economically unjustifiable when epoxy-coated rebar meets code requirements. Stainless is typically reserved for extremely aggressive environments like bridge decks in marine splash zones.
Option D: Galvanized steel rebar
Galvanized (zinc-coated) rebar does offer corrosion protection, but galvanizing is less effective than epoxy coating in high-chloride coastal environments. Chloride ions attack zinc coatings over time, and galvanized rebar is not the Hawaii Building Code's preferred specification for coastal construction, making epoxy-coated the more appropriate answer.
Memory Technique
Epoxy = the 'E' in coastal 'Environment.' For Hawaii's coastal exam questions, epoxy-coated rebar is almost always the correct middle-ground answer: better than plain steel, cost-effective, and code-compliant. Think: 'Epoxy is the standard, stainless is the splurge.'
More Hawaii Questions
A concrete mix design for coastal construction specifies a water-cement ratio of 0.40. If 650 lbs of cement is used per cubic yard, how many gallons of water should be added?
A contractor is installing hurricane straps rated at 1,500 pounds each. If the calculated uplift force on a rafter is 3,200 pounds, how many straps are required with a 2.0 safety factor?
Hawaii Building Code requires special inspection for concrete placement in seismic design categories. What is the minimum frequency for concrete strength testing?
What is the maximum allowable deflection for roof rafters under design wind loads in Hawaii's hurricane zones?
Which roofing attachment method is specifically required in Hawaii's hurricane zones for asphalt shingles on residential construction?
A building in Maui requires hurricane straps rated for 175 mph winds. If each strap must resist 1,200 lbs of uplift force and you have 48 roof-to-wall connections, what is the total uplift resistance provided?
During construction of a beachfront property, you notice white crystalline deposits forming on the concrete surface. This indicates:
You discover expansive clay soil conditions during excavation for a residential foundation in Kona. The plasticity index is 28. What foundation system is most appropriate?
According to Hawaii building requirements, hurricane straps connecting roof trusses to wall plates must be rated for what minimum uplift force in high wind zones?
A concrete slab foundation in Hawaii requires a vapor barrier. Due to high humidity and frequent rainfall, what type of vapor barrier is most appropriate?
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Calculate the required roof uplift resistance for a 2,000 sq ft residential roof in Hawaii's hurricane zone with a 150 mph wind speed requirement. Use uplift pressure of 45 psf.
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Calculate the required concrete strength for a foundation footing that must resist 45,000 lbs load with a footing area of 18 square feet, using a safety factor of 3.