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Calculate your roof pitch and angle
Hawaii receives about 63 inches of rain annually. Good drainage and quality underlayment are essential.
Climate Zone
1
Electricity
$0.35/kWh
Labor Costs
140% avg
Calculate roof pitch, angle, and slope from measurements
Hawaii is in Climate Zone 1 - Very Hot-Humid (minimal heating needs, heavy cooling). Homes here typically have higher cooling demands than heating.
You can measure roof pitch several ways:
A 6/12 pitch means the roof rises 6 inches for every 12 inches of horizontal distance. This is a moderate pitch common on many homes—steep enough to shed water well but walkable for roofing work.
Most shingle manufacturers require 4/12 minimum for standard installation. With enhanced underlayment, some allow installation down to 2/12. Below that, you need roll roofing or membrane systems.
Steeper pitches cost more to install. A 6/12 pitch is easily walkable. At 8/12, workers need extra caution. Above 10/12, safety equipment like roof jacks and harnesses become mandatory, adding time and cost.
Yes, but it's a major structural modification requiring new rafters or trusses. It's usually only done during major renovations. The cost often exceeds the original roof installation.