According to the Oregon Residential Specialty Code, what is the maximum allowable slope for a residential driveway?
Correct Answer
B) 25%
The Oregon Residential Specialty Code allows a maximum slope of 25% (1:4) for residential driveways.
Why This Is the Correct Answer
The Oregon Residential Specialty Code sets the maximum allowable slope for a residential driveway at 25% (equivalent to a 1:4 ratio, meaning 1 foot of rise for every 4 feet of horizontal run). This limit balances safe vehicle access with practical grading constraints on sloped lots.
Why the Other Options Are Wrong
Option A: 15%
15% is well below the code maximum and would unnecessarily restrict construction on moderately sloped lots. No Oregon code provision sets 15% as the driveway slope limit.
Option C: 30%
30% exceeds the code-allowed maximum of 25%. A driveway at 30% slope would create unsafe conditions for vehicles and pedestrians and is not permitted under the Oregon Residential Specialty Code.
Option D: 20%
20% is below the actual maximum of 25%. While a 20% driveway would be code-compliant, it is not the maximum allowed, making it an incorrect answer to this specific question.
Memory Technique
Remember '25 for the driveway' — a quarter of a full slope (25 out of 100). Picture a car struggling up a steep hill: Oregon says stop at 25% or you risk sliding back down.
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