For construction professionals, understanding the full cost of replacing roof underlayment is crucial. This essential component protects the roof structure from moisture and extends the lifespan of the roofing system. Costs can range from $3.50 to $5.50 per square foot, translating to $7,700 to $12,100 for a typical 2,200 ft² roof. This guide breaks down the key cost drivers and offers insights into accurate estimating for trade professionals.
1. Tear-Off Labor
Removing existing shingles and worn underlayment is labor-intensive. Labor rates vary by region, pitch, and accessibility. Steep slopes or multi-story properties add time and safety gear requirements.
2. Underlayment Material
Options range from traditional felt to modern synthetic or peel-and-stick membranes. Material cost per square (100 ft²) can swing 40%–70% depending on performance ratings and warranty length.
3. Fasteners & Flashing
Re-installing drip edge, valley metal, and cap nails is non-negotiable. Budget for corrosion-resistant hardware that meets residential building codes.
4. Disposal Fees
Old felt, nails, and damaged shingles must be hauled to an approved facility. Landfill tipping fees and dumpster rentals are often overlooked in DIY budgets.
5. Project Overhead
Insurance, permitting, and site protection (tarps, scaffolding) factor into any professional quote.
Across CountBricks-managed residential builds, full tear-off and underlayment replacement typically falls between $3.50 and $5.50 per square foot. A 2,200 ft² roof might therefore range from $7,700 to $12,100 depending on site variables.
Traditional estimating relies on manual tape measurements and rough allowances. CountBricks replaces guesswork with data-rich accuracy.
CountBricks frequently recommends premium synthetics when long-term life-cycle cost is the primary driver.
Bundle Repairs
If roof decking or flashing already shows rot, combining repairs with underlayment replacement saves repeat mobilization fees.
Off-Season Scheduling
Late winter and early spring slots often mean shorter lead times.
Tax Incentives
Some municipalities credit cool-roof rated underlayment. CountBricks tracks local incentives during estimate generation.
How long does underlayment last?
Felt may degrade after 15 years, while synthetics can surpass 25. However, roof slope, attic ventilation, and climate all influence longevity.
Is partial replacement possible?
Yes, but seams between old and new membranes can create weak points. CountBricks usually advises full replacement once more than 25% is compromised.
Can I install new underlayment over the old?
Building codes typically mandate removal to inspect decking. Layering can trap moisture and accelerate rot.
Ready to get precise numbers for your property? Visit CountBricks.com to schedule a quick roof scan. Our specialists will leverage live supplier pricing and deliver a detailed breakdown of the cost of replacing roof underlayment—no surprises, just data-driven clarity.
When the Martinez family noticed water stains on their living-room ceiling, they contacted CountBricks for an underlayment assessment. Our field rep used a smartphone mic to capture measurements while walking the roof. Within five minutes, CountBricks AI generated an itemized estimate:
Total project cost: $8,870—15% below the regional average thanks to optimized material bundles sourced through CountBricks suppliers.
The cost of replacing roof underlayment doesn’t have to be a mystery. Connect with a CountBricks expert at CountBricks.com, receive a data-driven proposal, and protect your home before the next storm season hits.
