Account
- Sign in / Register
- Orders
- Quotes
- Wishlist
- Comparison list
Roof Underlayment
Limited stock
Mid-States ASTM D-226 30 Asphalt Saturated Roof Underlayment 36 in x 72 ft, 216 sq ft
- Coverage area216sq ft
- Underlayment typeAsphalt-saturated felt
- Unrolled length72ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
APOC AP-26 #30 Tuff-Felt Premium Asphalt-Saturated Roof Underlayment 36 in x 72 ft, 216 sq ft
- Coverage area216sq ft
- Unrolled length72ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
APOC Gator-Skin Synthetic Roof Underlayment 42 in x 285.8 ft, 1000 sq ft
- Coverage area1000sq ft
- Underlayment typeSynthetic
- Unrolled length285.8ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
G.A.P. ASTM 30 D226 Asphalt Saturated Roof Underlayment 36 in x 72 ft, 216 sq ft
- Coverage area216sq ft
- Underlayment typeAsphalt-saturated felt
- Unrolled length72ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
Tamko No. 30 UL ASTM Asphalt Saturated Organic Felt Roof Underlayment 36 in x 72 ft, 216 sq ft
- Coverage area216sq ft
- Underlayment typeAsphalt-saturated felt
- Unrolled length72ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
Owens Corning RhinoRoof U20 Synthetic Roof Underlayment 42 in x 286 ft, 1000 sq ft
- Coverage area1000sq ft
- Underlayment typeSynthetic
- Unrolled length286ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
Mid-State Quik-Stick Ice & Water Rubberized Asphalt Roof Underlayment 36 in x 65 ft, 195 sq ft
- Coverage area195sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66.7ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
TAMKO Moisture Guard Ice & Rain Modified Bitumen Roof Underlayment 36 in x 64 ft, 193.5 sq ft
- Coverage area193.5sq ft
- Underlayment typeRubberized asphalt
- Unrolled length64ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area195sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
CertainTeed DryRoof SA Waterproof Rubberized Asphalt Roof Underlayment 36 in x 65 ft, 195 sq ft
- Coverage area195sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
ABC Pro Guard 20 Synthetic Roof Underlayment 42 in x 286 ft, 1000 sq ft
- Coverage area1000sq ft
- Underlayment typeSynthetic
- Unrolled length286ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
Grace Vycor Select Rubberized Asphalt Roof Underlayment 36 in x 65 ft, 195 sq ft
- Coverage area195sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
GAF FeltBuster Synthetic Roofing Felt 48 in x 250 ft, 1000 sq ft
- Coverage area1000sq ft
- Underlayment typeSynthetic
- Unrolled length250ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
GAF WeatherWatch Mineral-Surfaced Rubberized Asphalt Roof Underlayment 36 in x 66.7 ft, 200 sq ft
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66.7ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66.7ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
APOC Weather-Armor HT2 High Temperature Roof Underlayment 39 in x 65.67 ft, 200 sq ft
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65.67ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
CertainTeed WinterGuard Sand Long Asphalt-Saturated Roof Underlayment 36 in x 65 ft, 195 sq ft
- Coverage area195sq ft
- Underlayment typeAsphalt-saturated felt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area214sq ft
- Underlayment typeRubberized asphalt
- Unrolled length71.3ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
Polyglass Polystick TU MAX Self-Adhered Waterproofing Roof Underlayment 39 in x 65 ft 200 sq ft
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
Customer Choice
Boral TileSeal HT Modified Asphalt Roof Underlayment 36 in x 72 ft, 216 sq ft
- Coverage area216sq ft
- Underlayment typeRubberized asphalt
- Unrolled length72ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
Owens Corning Titanium PSU30 High-Temp Self-Adhered Roof Underlayment 36 in x 72 ft, 216 sq ft
- Coverage area216sq ft
- Underlayment typeRubberized asphalt
- Unrolled length72ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area108sq ft
- Underlayment typeRubberized asphalt
- Unrolled length32ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area215sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65.67ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area215sq ft
- Underlayment typeRubberized asphalt
- Unrolled length65ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66.7ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
Polyglass Polystick XFR Rubberized Asphalt Roof Underlayment 39 in x 49 ft, 160 sq ft
- Coverage area160sq ft
- Underlayment typeRubberized asphalt
- Unrolled length49ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
- Coverage area200sq ft
- Underlayment typeRubberized asphalt
- Unrolled length66ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
GAF VersaShield Fire-Resistant Roof Deck Protection 42 in x 100 ft, 350 sq ft
- Coverage area350sq ft
- Underlayment typeSynthetic
- Unrolled length100ft
- Application methodNail/Staple
Delivery on Jul 28–31
Limited stock
Grace Vycor Ice & Water Shield HT Rubberized Asphalt Roof Underlayment 36 in x 75 ft, 225 sq ft
- Coverage area225sq ft
- Underlayment typeRubberized asphalt
- Unrolled length75ft
- Application methodPeel & Stick
Delivery on Jul 28–31
Limited stock
Westlake Royal SwiftAnchor Synthetic Base Sheet 40 in x 300 ft, 1000 sq ft
- Coverage area1000sq ft
- Underlayment typeSynthetic
- Unrolled length300ft
- Application methodNail/Staple
Delivery on Jul 28–31
- Overview
- Articles
Complete Roof Underlayment Guide
🎯 Bottom Line Up Front
Quality roof underlayment is essential for any roofing system, providing critical protection against water damage, extending roof lifespan, and ensuring compatibility with solar panel installations. Synthetic underlayment offers superior durability and performance compared to traditional felt.
What Is Roof Underlayment?
Roof underlayment is a water-resistant barrier installed directly onto your roof deck, beneath the primary roofing material. The primary function of the roof underlay is to ensure long-term watertightness and thereby protect the roof structure.
💧 Moisture Protection
Provides crucial secondary defense against water infiltration, preventing leaks and structural damage.
🌡️ Thermal Regulation
Contributes to energy efficiency by helping regulate temperature fluctuations in the attic space.
🔧 Installation Surface
Creates a smooth, even foundation for your roofing material, ensuring proper installation.
☀️ Weather Protection
Serves as temporary protection during construction, with some products lasting 90-180 days exposed with UV inhibitors added to the polymers.
For solar panel installations, proper underlayment is critical as mounting systems require drilling through both roofing material and underlayment.
Roof Underlayment Types Comparison
🔹 Synthetic
Material: Polypropylene/Polyethylene
Lifespan: 30-50 years
Cost: $0.30-$0.70 per sq ft
Best For: All roof types
Solar Compatible: ✅ Excellent
🔹 Felt (#15)
Material: Asphalt-saturated organic
Lifespan: 15-20 years
Cost: $0.20-$0.40 per sq ft
Best For: Budget projects
Solar Compatible: ⚠️ Limited
🔹 Felt (#30)
Material: Asphalt-saturated organic
Lifespan: 20-25 years
Cost: $0.30-$0.60 per sq ft
Best For: Standard applications
Solar Compatible: ⚠️ Limited
🔹 Self-Adhering
Material: Rubberized asphalt
Lifespan: 40-50 years
Cost: $0.50-$1.20 per sq ft
Best For: Premium/Solar installs
Solar Compatible: ✅ Ideal
🔹 Metal Roof Specific
Material: High-heat resistant
Lifespan: 30-40 years
Cost: $0.75-$1.50 per sq ft
Best For: Metal roofing only
Solar Compatible: ✅ Required
Cost Breakdown & Analysis
💰 Felt Underlayment
$0.20 - $0.60
per square foot
Most budget-friendly option
⭐ Synthetic Underlayment
$0.30 - $0.70
per square foot
Most popular choice
💎 Self-Adhering
$0.50 - $1.20
per square foot
Premium protection
Installation Cost Reality: Material costs represent only 10-20% of total project cost. Labor typically accounts for 80-90% of underlayment replacement expenses, averaging $1.60 per square foot total.
Cost Variables
- Roof Complexity: Multiple valleys, dormers increase installation time
- Regional Factors: Metropolitan areas command 30-40% higher rates
- Seasonal Timing: Peak seasons may result in premium pricing
- Material Quality: Premium products offer extended warranties
Installation Process
1️⃣ Surface Preparation
Ensure roof deck is clean, dry, and structurally sound. Address any damaged decking materials.
2️⃣ Starting at Eaves
Begin installation at the lowest point of the roof, ensuring proper water flow direction.
3️⃣ Proper Overlapping
Overlap each row by at least 6 inches to create seamless water barrier.
4️⃣ Secure Fastening
Use roofing nails every 6 inches along edges, 12 inches in center areas.
5️⃣ Penetration Sealing
Cut and seal around vents, chimneys, and other roof features with appropriate flashing.
📋 Building Code Compliance
Underlayment must meet ASTM standards: D226 (felt), D4869 (organic felt), D6757 (inorganic), and D1970 (self-adhering) for code compliance.
Solar Panel Compatibility
✅ Solar-Ready Features
- Self-sealing around fasteners
- High temperature resistance (240°F )
- Extended UV exposure capability
- Matches solar system lifespan
- Enhanced waterproofing
⚠️ Considerations
- Higher upfront investment required
- Specific products needed for metal roofs
- Professional installation recommended
- Building code variations by region
- Thermal expansion compatibility
For solar system installations, self-adhering underlayment provides optimal performance due to automatic sealing around mounting fasteners and superior thermal resistance.
Frequently Asked Questions
How long does roof underlayment last?
Roof underlayment typically lasts as long as the roofing material covering it. Quality synthetic products can last 30-50 years when properly installed, while felt products last 15-25 years.
Is synthetic underlayment worth the extra cost?
Yes, for most applications. The upfront investment can save you money down the road through reduced maintenance, extended roof life, and better compatibility with modern roofing systems including solar installations.
Can I install solar panels on any type of underlayment?
While possible, self-adhering or high-heat rated synthetic underlayments provide optimal performance for solar installations due to their sealing properties and thermal resistance.
Do building codes require specific underlayment types?
Yes, roofing underlayment is required by the International Residential Code and local codes, must meet ASTM standards. Requirements vary by location, roof type, and slope conditions. Double underlayment application is required for certain roof slopes.
What's the best underlayment for metal roofs with solar panels?
Metal roofing requires specialized high-heat resistant underlayment with temperature ratings of at least 240°F. For solar installations, self-adhering products with thermal resistance are ideal as they seal automatically around mounting fasteners.
🏠 Need Quality Roof Underlayment for Your Project?
Don't compromise on protection! Whether you're planning a new roof or preparing for solar panel installation, choosing the right underlayment is crucial. Get premium synthetic and self-adhering underlayment products that ensure waterproof protection and solar compatibility.
Get Roof UnderlaymentRelated Articles
- By: Julia Zaraeva
- Batteries
- Updated: Jul 09, 2025
- By: Julia Zaraeva
- Burning questions
- Updated: Jul 09, 2025
- By: Sergey Fedorov
- Burning questions
- Updated: Jul 18, 2025
- By: Julia Zaraeva
- Save money with solar energy
- Updated: Jun 20, 2025
Stay tuned
Free and usefull digest on solar energy. No spam