Roofing Felt: 15 vs 30 Comparison Guide: Fast-Track Guide to Choosing the Right Roofing Felt for Your ProjectSarah ThompsonJun 09, 2025Table of ContentsUnderstanding Roofing FeltWeight Difference: 15 lb vs 30 lb FeltDurability and PerformanceCost ConsiderationsInstallation TipsFinal ThoughtsFAQTable of ContentsUnderstanding Roofing FeltWeight Difference 15 lb vs 30 lb FeltDurability and PerformanceCost ConsiderationsInstallation TipsFinal ThoughtsFAQFree Smart Home PlannerAI-Powered smart home design software 2025Home Design for FreeWhen it comes to roofing, choosing the right material can be a daunting task. Two common options are 15 lb and 30 lb roofing felt. In this article, we will explore the differences between them and help you make an informed decision.Understanding Roofing FeltRoofing felt, also known as tar paper, is an essential material used to provide a moisture barrier on roofs. It helps to protect your home from water damage while also providing a smooth surface for shingles or tiles. But what distinguishes 15 lb felt from 30 lb felt?Weight Difference: 15 lb vs 30 lb FeltThe primary difference between 15 lb and 30 lb roofing felt is their weight and thickness. The number associated with the felt indicates its weight per square (100 square feet). 15 lb felt is lighter, making it easier to install but providing less protection. On the other hand, 30 lb felt offers increased durability and better water resistance, which can be beneficial in areas with harsh weather conditions.Durability and PerformanceWhile the weight difference significantly impacts their durability, it's crucial to consider your roofing needs. 30 lb felt is often recommended for low-slope roofs or high ice-dam areas. It is more resistant to tearing and provides enhanced protection against moisture penetration.Cost ConsiderationsCost can also influence your choice. 15 lb felt is generally cheaper due to its lighter material, making it an appealing choice for budget-conscious homeowners. However, investing in 30 lb felt might save you from potential repairs down the line, which can be costlier than the initial price difference.Installation TipsWhen installing roofing felt, ensure that it is laid down properly to create a seal against the elements. Overlap the sheets as you work your way up the roof. It is equally important to follow manufacturer guidelines to maximize the material's performance.Final ThoughtsDeciding between 15 lb and 30 lb roofing felt comes down to your specific needs. If you live in an area with mild weather and want to save on costs, 15 lb felt could suffice. However, if you face extreme weather conditions, investing in 30 lb felt is likely the better choice.FAQQ: How long does roofing felt last?A: Typically, roofing felt lasts between 15 to 30 years depending on factors like installation quality and environmental conditions.Q: Can I use 15 lb felt for a steep roof?A: Yes, but for added durability and moisture resistance, it is advisable to choose 30 lb felt, especially in areas with heavy snowfall or rain.Home Design for FreePlease check with customer service before testing new feature.