15# vs 30# Roofing Felt: Which Is Right for You?: Fast-Track Guide to Choosing the Best Roofing FeltSarah ThompsonSep 09, 2025Table of ContentsTips 1:FAQTable of ContentsTips 1FAQFree Smart Home PlannerAI-Powered smart home design software 2025Home Design for FreeWhen it comes to selecting roofing underlayment, homeowners and contractors often face the choice between 15# and 30# roofing felt. Both serve as protective layers beneath shingles, safeguarding your roof from moisture, wind, and other outdoor elements. But the right option depends on your project’s needs and budget. The "15#" refers to a lighter, 15-pound felt paper, while "30#" is a heavier, 30-pound alternative. Here’s a breakdown of how these two products differ and which might be best for your next roofing project.Tips 1:15# roofing felt is thinner, lighter, easier to handle, and generally less expensive. It's commonly used for residential roofs where a lighter underlayment suffices and installation speed is important. However, it can tear more easily during installation and in harsh weather. On the other hand, 30# roofing felt is thicker, more durable, and provides better water resistance and protection—ideal for steeper roofs, areas exposed to severe weather, or when extra longevity is desired. As a designer, I always consider not just function but how underlayment serves as the ‘foundation’ for seamless integrations with the rest of the home’s style and layout. For anyone planning comprehensive home improvement, tools like a 3D Floor Planner offer a unique way to visualize how materials and layers fit together, helping ensure that every element—from roofing felt to final decor—works in harmony.FAQQ: What is the main difference between 15# and 30# roofing felt? A: 15# felt is lighter and thinner, while 30# felt is thicker and heavier, providing greater durability and water resistance.Q: Can I use 15# felt for all roofing projects? A: 15# felt suits most residential applications, but 30# felt is preferred for steeper pitches, severe climates, or where extra protection is needed.Q: Is 30# roofing felt worth the extra cost? A: It’s more expensive, but offers increased protection and longevity—ideal if you want a robust underlayment.Q: Does roofing felt improve home insulation? A: Roofing felt provides a moisture barrier, but only minimally impacts insulation. Its main role is water protection.Q: Should I consult a professional before choosing roofing felt? A: Yes. Professional advice ensures you select the best underlayment for your roof’s specific needs and climate.Home Design for FreePlease check with customer service before testing new feature.