Asphalt Shingle Underlayment
Used over suitable roof decking beneath asphalt shingles as a secondary water-shedding layer. Fastening, laps and exposure limits must follow the selected roofing system and applicable local requirements.
Factory Direct Supply
Asphalt Roofing Felt
Asphalt-saturated organic roofing felt designed for roof-deck underlayment beneath asphalt shingles and for use as a ply in compatible hot-asphalt roofing or waterproofing assemblies. Tianyuan catalog configurations include 1 m width, 0.5 mm and 0.8 mm thickness options, with grey or black appearance. Exact grade and standard compliance should be confirmed against the current TDS before procurement.
Asphalt Roofing FeltRoofing Underlayment15 lb / 30 lb (No.15/No.30) Grades1m x 20m RollsHot-Asphalt BUR PlyCost-Effective Underlayment
Typical Applications
Shingle underlayment / compatible built-up roofing ply
Standard Roll Size
1 m width; roll length to be confirmed by grade
For project-specific pricing, send your technical requirements and destination port.
Direct Supply OEM Labeling Technical Support
Product Overview
Specification-Led Underlayment for Export Roofing Projects
Tianyuan's Asphalt Roofing Felt is a professional-grade organic fiber sheet saturated with high-purity asphalt. It serves as the primary secondary water-shedding layer beneath asphalt shingles and as a reliable reinforcing ply in complex built-up roofing (BUR) assemblies.
Full Impregnation
Organic fiber carrier is saturated through its full thickness for superior rain and moisture resistance.
ASTM D226 Compliant
Available in Type I (15#) and Type II (30#) grades to meet international building codes.
Fast Installation
Mechanically fastened or embedded in hot asphalt. No torch, no primer, and zero curing time required.
Grade Comparison: Type I (15 lb) vs Type II (30 lb)
| Performance Metric | Type I (No. 15) | Type II (No. 30) — Heavy Duty |
|---|---|---|
| Saturated Felt Mass | ≥ 560 g/m² | ≥ 1270 g/m² |
| Breaking Strength (MD) | ≥ 30 lbf/in | ≥ 40 lbf/in |
| Pliability (at 23°C) | No Crack | No Crack |
| Recommended Use | Standard steep-slope roofing | Heavy BUR & long-term exposure |
Expert Underlayment Selection Tip
Installing Asphalt Shingles?
For standard residential projects, Type I (15#) is the most cost-effective choice. It provides sufficient secondary protection without excessive roll weight.
Need Puncture Resistance?
For large-scale industrial projects or multi-layer assemblies, specify Type II (30#). Its increased mass offers better durability against job-site foot traffic.
See the technical specifications, installation guide and packaging sections for full details, or request the TDS and quotation.
Available Configurations
Select the reinforcement, thickness and surface finish to match your project requirements. Contact us with your specification for a tailored quotation.
| Configuration | Reinforcement | Thickness | Surface | Recommended Use |
|---|---|---|---|---|
| Organic Felt Underlayment 0.5 | Organic fiber felt | 0.5 mm | Grey / Black | Roof-deck underlayment beneath compatible asphalt shingles or roof coverings |
| Organic Felt Underlayment 0.8 | Organic fiber felt | 0.8 mm | Grey / Black | Roof-deck underlayment or selected compatible asphaltic system applications |
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All thicknesses and surface finishes shown are available in standard production. Custom roll dimensions, packaging and private-label printing are available subject to minimum order quantity. Final configuration should be selected according to climate, substrate, waterproofing system design, exposure condition and local project specifications.
Applications
Built-Up Roofing Ply
Selected grades may be incorporated as a reinforcing ply in compatible low-slope built-up roofing systems using the asphalt type and layer configuration specified by the system designer.
Hot-Asphalt System
The felt may be embedded in compatible hot asphalt as part of a designed multi-layer roofing or waterproofing assembly. It is not a standalone exposed waterproofing membrane.
Key Benefits
Full Asphalt Impregnation
The organic fiber carrier is passed through molten asphalt and hot-roller extruded so the sheet is impregnated through its full thickness rather than merely coated — the construction described in the Tianyuan product catalog for asphalt roofing felt.
Type I / Type II Catalog Grades
Catalog data groups the felt into Type I (15#) and Type II (30#) performance grades aligned to ASTM D226 requirement levels, with minimum saturated-felt mass of 560 g/m2 and 1270 g/m2 respectively.
Heat-Stable Asphalt Saturant
Catalog performance data shows max 4.00% loss on heating at 105 degC for 5 h, supporting use in warm export climates when stored and transported per the catalog guidance (below 45 degC, protected from direct sun and rain).
Field-Proven Installation Options
The felt can be mechanically fastened as steep-slope underlayment or embedded in compatible hot asphalt as a built-up roofing ply — no torch, primer or curing time required on site.
Technical Specifications
Technical properties depend on the selected grade, construction and target standard. Tianyuan catalog data confirms nominal 1 m width, 0.5 mm / 0.8 mm thickness and grey / black configurations, with Type I / Type II performance grades aligned to the ASTM D226 15# / 30# (15 lb / 30 lb) requirement levels shown in the table (D4869-equivalent levels are also available). Grade-specific physical properties should be confirmed against the latest Tianyuan TDS or applicable test report before procurement.
| Test Item | Unit | Test Method | Requirement | Result / Notes |
|---|---|---|---|---|
| Nominal Width | m | Tianyuan product catalog | Catalog configuration | 1.0 |
| Nominal Thickness | mm | Tianyuan product catalog | Catalog configuration | 0.5 / 0.8 |
| Color | — | Tianyuan product catalog | Catalog configuration | Grey / Black |
| Supply Form | — | Tianyuan product catalog | Catalog configuration | Roll |
| Performance Grade | — | Tianyuan product catalog | Type I / Type II | Type I (15#) / Type II (30#) |
| Pliability (23 +/- 2 degC, 90 deg bend) | mm radius | ASTM D226 / D4869 per catalog | No crack | 12.7 |
| Tear Strength (23 +/- 2 degC) | N | ASTM D226 / D4869 per catalog | Min | 2.5 |
| Breaking Strength MD — Type I / Type II | lbf/in | ASTM D226 15# / 30# per catalog | Min | 30 / 40 |
| Breaking Strength CD — Type I / Type II | lbf/in | ASTM D226 15# / 30# per catalog | Min | 15 / 20 |
| Loss on Heating (105 degC, 5 h) | % | ASTM D226 per catalog | Max | 4.00 |
| Net Mass of Saturated Felt — Type I / Type II | g/m2 | ASTM D226 15# / 30# per catalog | Min | 560 / 1270 |
| Saturation — Type I / Type II | % by wt | ASTM D226 15# / 30# per catalog | Min | 120 / 150 |
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ASTM D226/D226M and ASTM D4869/D4869M are referenced as relevant industry specification frameworks. Mention of these standards does not by itself constitute certification or compliance for every Tianyuan configuration. Confirm the required standard, type, edition, roll configuration and test results before specification or purchase.
Installation Guide
Common Substrate Preparation
Confirm the approved roof system before installation. The roof deck or waterproofing substrate must be structurally sound, smooth, clean and dry. Remove dust, loose material, sharp projections and other contaminants that could create wrinkles, punctures or poor contact.
Method A — Roof Underlayment
Install horizontal courses from the lower roof edge upward so successive sheets shed water. Keep the felt smooth and mechanically fasten it in accordance with the roof-covering manufacturer's instructions, project specification and local code.
Method B — Hot-Asphalt System
Where the approved built-up roofing or waterproofing system specifies hot asphalt, prepare the substrate as required, apply the compatible asphalt compound and embed the felt while maintaining continuous contact without trapped air. Confirm asphalt type, laps and temperature limits before work.
Protection and Exposure Control
Asphalt-saturated felt is an underlayment or system ply, not a permanent exposed roof covering. Minimize unnecessary exposure and complete the specified roofing or waterproofing assembly as soon as practical.
Packaging & OEM
Roll Packaging
Rolls can be supplied with protective plastic film. Final roll dimensions, wrapping and labeling should be confirmed for the selected grade before shipment.
Storage Conditions
Store rolls in a dry, ventilated location protected from direct sunlight, rain and other weather exposure. Follow the current product storage instructions for the selected grade.
Stacking
Keep different product types and sizes separated and protect rolls from crushing, leaning and side pressure. Confirm the approved stacking method before storage.
Transportation
Protect rolls from rain, direct sun and mechanical damage during loading and transportation. Use additional protective covering where required.
Ordering Information
Export Supply Reference
Grade Confirmation
State the intended roof system, target market, required thickness and any ASTM designation when requesting a quotation so the correct configuration can be confirmed.
Technical Documentation
Request the latest grade-specific TDS and available test documentation before using numerical performance values in a project specification.
Standard Selection
Do not select roofing felt only by the historical No.15 or No.30 name. Confirm the applicable ASTM type, physical-property requirements, roll dimensions and local roofing-code requirements.
Packaging Requirements
Export wrapping, labels, roll identification and other packing requirements can be discussed during order confirmation without assuming unverified pallet quantity or container loading data.
Project Selection Support
Provide the roof covering, roof slope, substrate, installation method and target market when requesting product selection support.
Type I / Type II Selection
Catalog data groups the felt into Type I and Type II performance grades, aligned to the ASTM D226 15# and 30# (15 lb and 30 lb) requirement levels shown in the technical table. State the target standard and grade when requesting a quotation so the correct configuration is confirmed.
Technical Downloads
Asphalt Felt Technical Data Sheet
Ready for PDF Request
Underlayment Installation Guide
Ready for PDF Request
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Frequently Asked Questions
What is asphalt roofing felt?
It is a flexible roofing sheet made from an organic fiber felt carrier saturated with asphalt. It is commonly used as roof underlayment beneath compatible roofing materials and, in selected systems, as a ply in built-up roofing or asphaltic waterproofing assemblies.
Is asphalt roofing felt the same as a self-adhesive bitumen membrane?
No. Standard asphalt-saturated organic felt does not have a peel-off release liner or factory-applied self-adhesive layer. It is normally mechanically fastened as roof underlayment or incorporated with compatible asphalt in a specified multi-ply system. Projects requiring peel-and-stick waterproofing should use a purpose-designed self-adhered membrane.
What is the difference between 15 lb and 30 lb roofing felt?
No.15 and No.30 are traditional roofing-felt grade designations. Under ASTM D226, Type I is commonly referred to as No.15 and Type II as No.30. Buyers should not rely on the name alone because actual mass, strength, roll coverage and applicable standard must be confirmed from the current product specification.
What is the difference between ASTM D226 and ASTM D4869?
ASTM D226 covers asphalt-saturated organic felt used in roofing and waterproofing, including steep-slope underlayment and specified built-up roofing or waterproofing applications. ASTM D4869 is specifically focused on asphalt-saturated organic felt underlayment for steep-slope roofing. The correct standard depends on the intended system and project specification.
Can asphalt felt be installed under asphalt shingles?
Yes, asphalt-saturated organic felt is widely used as roof-deck underlayment beneath asphalt shingles when the selected grade and installation comply with the roofing system, shingle manufacturer's instructions and applicable local requirements.
Can this felt be used in a built-up roofing system?
Certain asphalt-saturated organic felt grades can be used as plies in compatible built-up roofing systems with specified roofing asphalt. The felt type, perforation, asphalt type, number of plies and installation method must be confirmed as part of the complete roof-system design.
Can asphalt roofing felt be used for underground waterproofing?
Asphalt-saturated felt can be incorporated into some designed asphaltic waterproofing assemblies, but it should not automatically be treated as a standalone underground waterproofing membrane. Substrate conditions, asphalt type, layer configuration and project waterproofing requirements must be evaluated before selection.
Is roofing felt a permanent exposed waterproofing layer?
No. Standard asphalt roofing felt is primarily an underlayment or system ply. It should normally be protected by the specified roof covering or subsequent waterproofing layers rather than left as the permanent exposed surface.
What sizes are currently listed in the Tianyuan catalog?
The available catalog information lists a nominal width of 1 m and nominal thickness options of 0.5 mm and 0.8 mm, with grey or black appearance. Exact roll length, mass and standard-specific configuration should be confirmed before quotation.
How should asphalt roofing felt be stored?
Keep rolls dry, protected from direct sunlight and rain, and stored in a ventilated location. Separate different sizes and grades and protect rolls from crushing, leaning and side pressure during storage and transportation.
Can asphalt felt be installed over a concrete roof deck?
Yes, asphalt-saturated organic felt can be applied over suitably prepared concrete roof decks as well as wood decks, depending on the approved system design. The concrete surface must be sound, clean and dry, and the installation method (mechanically fastened underlayment, hot-asphalt bonded ply, or a layer in a specified multi-ply assembly) must follow the project specification and applicable local requirements.
How does asphalt roofing felt behave in hot climates?
The felt carrier is fully saturated with asphalt, which provides a stable water-resistant barrier in warm conditions. Catalog performance data includes loss on heating at 105 degC (max 4%) and Type I / Type II mass and strength grades aligned to ASTM D226 15# / 30# requirement levels. For project-specific high-temperature behavior, request the grade-specific TDS and confirm the applicable standard and grade before specification.
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