A contractor finds lava rock during excavation for a foundation in Kona. What is the primary consideration for foundation design on this substrate?
Correct Answer
C) Increased bearing capacity allows smaller footings
Lava rock typically provides excellent bearing capacity, often allowing for smaller foundation footings than required for other soil types, while providing stable support.
Why This Is the Correct Answer
Lava rock typically provides excellent bearing capacity, often allowing for smaller foundation footings than required for other soil types, while providing stable support.
More hi-trade 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?
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Previous Question
Calculate the required roof uplift resistance for a building in Maui with basic wind speed of 140 mph, exposure category C, and roof height of 25 feet. Use simplified method with Kzt = 1.0.
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In Hawaii's tropical climate, what is the primary concern when selecting concrete mix designs for coastal construction?