Roofing felt looks like a thick, dark gray or black paper-like material that sits under your shingles. It is a layer of protection between your roof deck and the shingles you see from the street. Think of it as a blanket that catches water and keeps it away from your home. This material has been used for many years to help roofs last longer. According to industry data, the average roof lifespan ranges from 25 to 50 years, and felt plays a big role in making that happen.
What Is Roofing Felt Made from?
Roofing felt is made from paper or fiberglass that gets soaked in tar or asphalt. This makes it waterproof and strong. The material becomes a solid sheet that can handle wind, rain, and sun without falling apart.
When you touch roofing felt, it feels stiff and bumpy. It has a rough surface with tar coating. The dark color helps it blend with your roof deck.
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What Color and Texture Does It Have?
Most roofing felt is dark gray or black. This dark color helps absorb heat and protects the underlayer. The surface is bumpy and has a woven or matted texture.
Some types have a smooth side and a bumpy side. The bumpy side sticks to the roof deck. The smooth side keeps water from pooling.
How Thick Is Roofing Felt?
Roofing felt comes in different weights. Common types include:
- 15-pound felt: Thin and light
- 30-pound felt: Medium thickness, more common
- Synthetic felt: Very durable and long-lasting
According to RubyHome (2025), asphalt shingles, which sit on top of felt, cost between $4.25 and $4.95 per square foot for basic options. The felt underneath costs less but is just as important for protection.
Where Does Roofing Felt Go?
Roofing felt goes directly on your roof deck. Roofers nail it down or use tar to stick it on. Then shingles go on top of the felt.
The felt creates a waterproof layer. If water gets under your shingles, the felt stops it from reaching the wood underneath. According to RubyHome (2025), leaking is the reason 33% of homeowners replace their roofs. Good felt helps prevent this problem. Modern roofs also use synthetic underlayment, which is stronger and lasts even longer than traditional felt.
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Connect with an experienced roof contractor to discuss your roofing needs and schedule an inspection.