![ASTM D226/D226M-17(2023) - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing ASTM D226/D226M-17(2023) - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing](https://webstore.ansi.org/cover-pages/small/ASTM/D0226_D0226M-17R23.jpg)
ASTM D226/D226M-17(2023) - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing
![Synthetic Roofing Underlayment vs. Felt Roofing Underlayment: What's the Difference? - Big League Roofers Synthetic Roofing Underlayment vs. Felt Roofing Underlayment: What's the Difference? - Big League Roofers](https://bigleagueroofers.com/wp-content/uploads/2022/03/UnderLaymentBlog.jpg)
Synthetic Roofing Underlayment vs. Felt Roofing Underlayment: What's the Difference? - Big League Roofers
![ASTM D226-05 - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing ASTM D226-05 - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing](https://webstore.ansi.org/cover-pages/small/ASTM/ASTM+D226-05.jpg)
ASTM D226-05 - Standard Specification for Asphalt-Saturated Organic Felt Used in Roofing and Waterproofing
![ASTM D226 Synthetic Roof Underlayment Customized Colors Logo Printed Synthetic Roofing Membrane - China Fully Synthetic Roofing Membrane Underlay, Roofing Material Waterproof Breathable Underlay | Made-in-China.com ASTM D226 Synthetic Roof Underlayment Customized Colors Logo Printed Synthetic Roofing Membrane - China Fully Synthetic Roofing Membrane Underlay, Roofing Material Waterproof Breathable Underlay | Made-in-China.com](https://image.made-in-china.com/2f0j00ekOzVdmylYua/ASTM-D226-Synthetic-Roof-Underlayment-Customized-Colors-Logo-Printed-Synthetic-Roofing-Membrane.webp)