You do need roofing felt under shingles. Roofing felt is a protective layer that goes under your shingles to stop water from reaching your roof deck. It acts like a second line of defense when rain gets past the shingles. Without it, water can damage the wood underneath and cause leaks. Most building codes require roofing felt for this reason. It also helps your roof last longer and protects your home.
What Does Roofing Felt Do?
Roofing felt stops water from seeping into your home. When shingles get old or damaged, water can leak through. The felt catches that water and directs it down and off your roof.
Felt also fills small gaps between shingles and the roof deck. It gives your roof a smooth, even surface. This helps shingles lay flat and work better.
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Types of Roofing Underlayment
There are three main types of roofing felt and underlayment. Each one works a little differently and costs different amounts.
| Type | Cost Per Sq. Ft. | Lifespan |
|---|---|---|
| Traditional Felt | $0.50, $0.75 | 15, 20 years |
| Synthetic Felt | $0.75, $1.50 | 25, 30 years |
| Rubberized Asphalt | $1.50, $2.00 | 30+ years |
How Long Does Roofing Felt Last?
Traditional felt lasts 15 to 20 years. Synthetic felt can last 25 to 30 years. Rubberized asphalt underlayment lasts even longer, up to 30 years or more.
The felt wears out over time from sun, heat, and moisture. When your roof gets replaced, the old felt should come off too. According to RubyHome, the average roof lifespan range is 25 to 50 years, so your felt may need replacement during that time.
Do All Roofs Need Felt?
Most roofs need felt, but it depends on your roof type. Asphalt shingles almost always need felt underneath. Metal roofs and tile roofs may use different underlayment.
Building codes require underlayment in most places. According to industry data, asphalt shingles dominate roughly 80% of residential projects. This means most homes need felt. Some newer synthetic materials can work without traditional felt, but they are more expensive. Felt is cheap insurance against water damage to your home.
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If you need help with your roof, reach out to a trusted roofing solutions for clear pricing and reliable service.