According to Oregon building codes, what is the minimum R-value requirement for ceiling insulation in Climate Zone 4C?
Correct Answer
C) R-49
The Oregon building code requires a minimum of R-49 ceiling insulation in Climate Zone 4C, which covers most of western Oregon.
Why This Is the Correct Answer
R-49 is the minimum ceiling insulation requirement for Climate Zone 4C under Oregon building codes. Climate Zone 4C covers most of western Oregon (including the Portland metro area and the Willamette Valley), which has a moderate but still cool climate requiring significant insulation. R-49 balances energy efficiency with cost-effectiveness for this region.
Why the Other Options Are Wrong
Option A: R-38
R-38 is the minimum requirement for warmer climate zones (such as Climate Zone 3) and is insufficient for Oregon's Climate Zone 4C. Using R-38 would not meet current Oregon building code and would result in greater heat loss through the ceiling.
Option B: R-60
R-60 exceeds the minimum requirement for Climate Zone 4C. This higher value is sometimes used voluntarily for superior energy performance or may apply in colder Climate Zone 6 areas of Oregon (e.g., eastern Oregon high desert), but it is not the code minimum for 4C.
Option D: R-70
R-70 is not a standard code-mandated R-value for any Oregon climate zone. It far exceeds the minimum requirements for Climate Zone 4C and would be an unnecessary expense beyond code compliance.
Memory Technique
Think '4C = 49': the zone number 4 and the letter C (3rd letter = 3 digits) point you toward the 49 value. Or remember: 'Four-See Forty-Nine' — Climate Zone 4C, R-49.
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A contractor performs $8,500 worth of work on a residential property in Oregon. The homeowner fails to pay. Calculate the maximum lien amount the contractor can claim under ORS 87 if no other liens exist.
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A contractor fails to obtain required permits for electrical work on a residential project in Oregon. The homeowner discovers this 6 months later. Under ORS 701, what is the potential penalty the CCB can impose?