Roof Underlayment (Synthetic) Cost & Calculator

Name: Roof Underlayment (Synthetic) 2026 material cost dataset entry
Creator: HammerIO
License: https://hammerio.com/terms/

Unit Price

$0.25

per sq ft

Labor Cost

$0.15

per sq ft

Durability

years lifespan

Sustainability

3/5

Average

Category: Roofing

Range: $0.15 – $0.45/sq ft

Waste Factor: 10%

Avg Project: $750

Material estimate workflow

Estimate Roof Underlayment (Synthetic) Cost Before You Order or Compare Bids

Step 1

Price Roof Underlayment (Synthetic) by the right unit

Start with the measured quantity in sq fts, then compare the current unit range of $0.15 to $0.45 per sq ft.

Step 2

Add waste, labor, and install accessories

Apply the default 10% waste factor, then include labor, fasteners, trim, adhesives, delivery, rental tools, and other project-specific accessories.

Step 3

Use the result to check written bids

Compare the calculator result against supplier units and contractor line items, then verify code, permit, and site-condition assumptions before ordering.

Contractor Takeoff Notes

How to Budget Roof Underlayment (Synthetic) Without Missing Hidden Costs

Roof Underlayment (Synthetic) should be budgeted as a complete installed assembly, not only as a commodity unit price. Quantity, waste, labor, local supply, code requirements, and the accessories needed for installation drive the final project cost.

$44

sample total for 111 sq fts

Price drivers

+Unit price ranges from $0.15 to $0.45 per sq ft, with $0.25 as the national midpoint used in this calculator.
+Labor is modeled at $0.15 per sq ft, but local contractor rates and project access can move that number sharply.
+The default 10% waste factor covers typical cuts and field losses; complex layouts need a larger buffer.

Ordering checks

+Measure the installed quantity in sq fts before adding waste or accessories.
+Confirm grade, thickness, profile, warranty, and code requirements before comparing quotes.
+Price delivery, fasteners, adhesives, trim, reinforcement, disposal, and rental equipment separately.

Quote risks

!A low material price can still produce an expensive job when labor, accessories, or rework are missing from the estimate.
!Regional supply shortages, minimum delivery charges, and permit requirements can change the final installed cost.

Best next estimators for this material

Roofing CalculatorEstimate roof squares, bundles, and roofing material waste.Roofing Materials ComparisonCompare major roofing materials by cost and lifespan.

Roof Underlayment (Synthetic) Cost Calculator

Quantity Needed: 100 sq fts

1 sq ft1,000 sq fts

Options

Include 10% waste factor (+10 sq fts)Include labor ($0.15/sq ft)

Order quantity: 111 sq fts (100 + 10% waste)

Material Cost

$28

incl. $3 waste buffer

Labor Cost

$17

Total Estimated Cost

$44

Based on 111 sq fts at $0.25/sq ft + $0.15/sq ft labor. Actual costs vary by location and supplier.

Specifications

MaterialPolypropylene

Roll Size4' x 250' (10 sq)

Weight~16 lbs/roll

PermeanceVaries (check local code)

Price Comparison with Alternatives

Material	Price	Durability	Sustainability	Cost/Year
Roof Underlayment (Synthetic) (current)	$0.25/sq ft	30 yrs	3/5	$0.01
Ice and Water Shield	$0.90/sq ft	30 yrs	2/5	$0.03

Cost/Year = unit price divided by expected lifespan. Lower cost/year indicates better long-term value. Note: units may differ between materials.

Best Uses

Under shingles
Under metal roofing
Under tile roofing
Temporary weather protection

Material Details

Average Project Cost

$750

Typical project using this material

Sustainability Rating

Average — moderate environmental impact

Waste Factor

10%

Order 10% extra to account for cuts, breakage, and fitting

Roof Underlayment (Synthetic): Complete Buying Guide 2026

Synthetic roof underlayment is a water-resistant barrier installed under roofing materials. It is lighter, stronger, and more tear-resistant than traditional felt paper, providing critical secondary weather protection. In 2026, roof underlayment (synthetic) prices average $0.25 per sq ft, with a typical range of $0.15 to $0.45 depending on your region, supplier relationships, and order quantity.

When budgeting for a project using roof underlayment (synthetic), factor in approximately 10% additional material for waste, plus labor costs averaging $0.15 per sq ft for professional installation. A typical project using this material runs approximately $750 including both materials and labor.

With an expected lifespan of 30 years, roof underlayment (synthetic) represents a cost of approximately $0.01 per sq ft per year of service life. This solid lifespan provides good value for most residential and commercial applications.

For searchers comparing bids, the key number is not only the shelf price. The installed cost for roof underlayment (synthetic) depends on accessory materials, waste, job access, minimum order size, delivery, regional labor rates, and whether the project needs permit or code-driven upgrades. This page combines the HammerIO material database with 2026 cost modeling, contractor takeoff assumptions, and public construction cost references.

More Roofing Materials

Clay Roof Tiles

$12.00/sq ft

100 yrs lifespan • Sustainability: 5/5

Concrete Roof Tiles

$6.50/sq ft

50 yrs lifespan • Sustainability: 3/5

Ridge Vent

$3.50/linear foot

25 yrs lifespan • Sustainability: 3/5

Methodology & Data Sources — Roof Underlayment (Synthetic) Cost Data

How we calculate Roof Underlayment (Synthetic) costs: Our pricing model combines the HammerIO material database, RSMeans-style construction assemblies, EPA Environmentally Preferable Purchasing guidance for sustainability ratings, DOE Building Technologies Office benchmarks for energy-related materials, and contractor takeoff assumptions. Unit prices are reviewed quarterly and cross-checked against common supplier ranges where available.

Unit price ($0.25/sq ft): National midpoint estimate for mid-market grade materials sourced through standard supply channels.
Average project cost ($750): Derived from material quantity, labor allowance, waste, and typical residential/light commercial installation assumptions.
Waste factor (10%): Per NAHB (National Association of Home Builders) construction waste estimation guidelines, accounting for cuts, breakage, and field adjustments.
Durability (30 years): Lifespan estimates sourced from HUD Residential Rehabilitation Inspection Guide and manufacturer warranty data aggregated by DOE ORNL.
Sustainability rating (3/5): Composite score from EPA Environmentally Preferable Purchasing criteria, including embodied carbon, recyclability, and VOC emissions per LEED v4.1 thresholds.

Disclaimer: Construction material prices vary significantly by region, supplier, project volume, and market conditions. The figures shown represent national averages and should be used for budgeting and comparison purposes only. Always obtain local contractor quotes before committing to a project budget.

Reviewed by Brazora Monk · Last updated May 31, 2026 · Pricing sourced from the HammerIO 2026 material database, RSMeans-style assemblies, public agency guidance, and contractor takeoff assumptions

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Frequently Asked Questions

How much does roof underlayment (synthetic) cost in 2026?

Roof Underlayment (Synthetic) costs an average of $0.25 per sq ft in 2026. Prices range from $0.15 to $0.45 per sq ft depending on your location, supplier, and quantity purchased. A typical project using roof underlayment (synthetic) costs approximately $750.

How long does roof underlayment (synthetic) last?

Roof Underlayment (Synthetic) has an expected lifespan of approximately 30 years when properly installed and maintained. Actual durability depends on climate exposure, installation quality, and maintenance practices. This provides good long-term value for most residential applications.

What is roof underlayment (synthetic) used for?

Roof Underlayment (Synthetic) is commonly used for Under shingles, Under metal roofing, Under tile roofing, Temporary weather protection. It falls in the Roofing category of construction materials. Synthetic roof underlayment is a water-resistant barrier installed under roofing materials. It is lighter, stronger, and more tear-resistant than traditional felt paper, providing critical secondary weather protection.

How much waste should I plan for with roof underlayment (synthetic)?

Plan for approximately 10% waste when ordering roof underlayment (synthetic). For a project requiring 100 sq fts of material, you should order 111 sq fts to account for cuts, breakage, and fitting. Waste factors vary by project complexity and installer experience.

What are alternatives to roof underlayment (synthetic)?

Common alternatives to Roof Underlayment (Synthetic) include Ice and Water Shield. Each alternative offers different trade-offs in terms of cost, durability, and performance. Ice and Water Shield costs $0.90 per sq ft and lasts approximately 30 years.

Is roof underlayment (synthetic) sustainable?

Roof Underlayment (Synthetic) has a sustainability rating of 3 out of 5 (Average). This material has an average environmental impact. Consider locally sourced options when available to reduce transportation-related emissions.