Underlayment for shingles protects the roof deck from moisture, stabilizes the system during installation, and supports long-term performance. A reliable roofing assembly starts with materials that seal vulnerable areas and provide consistent coverage across the entire surface.
Our standard process uses two rows of ice and water in the high-risk zones, followed by a durable synthetic underlayment across the field. This setup has proven stronger and more reliable than older materials that no longer meet current performance expectations.
Common Types of Underlayment for Shingles
Ice and Water Shield
The first step on every roof we install is applying two rows of ice and water shield. This layer is critical because it seals around nails and prevents moisture from penetrating the roof deck. It’s used on all houses we service before any other underlayment is applied. Ice and water barriers are especially important along eaves, valleys, and other areas where leaks are most likely to start.
Synthetic Underlayment
After the ice and water shield, we install a synthetic underlayment. This has replaced traditional felt paper as the preferred option on most projects. Synthetic underlayment doesn’t tear like felt, has better grip, and stays in place securely during installation. It provides strong coverage and supports a full system warranty, depending on the shingle type and warranty program you select.
Key Takeaway: Synthetic underlayment gives a stronger, more reliable barrier and helps qualify your roof for full system warranties.
Traditional Felt Paper (15 lb and 30 lb)
Standard tar felt paper used to be the go-to underlayment material. The 15 lb and 30 lb versions are still available, but they are now considered a thing of the past. Although slightly cheaper, felt paper doesn’t hold up as well as synthetic materials. It tears more easily, lacks the same level of grip, and requires more material to cover the same area. Because of these issues, it’s no longer our first choice for durable roof protection.
Pro Tip: If you’re comparing quotes, ask your contractor which underlayment they use. Synthetic products typically perform better and qualify for stronger warranties.
Need expert help with a roof replacement? Contact Precision Roofing for a free consultation. Our team installs full roofing systems using the best materials for lasting results.
Cost and Labor Considerations
The cost difference between synthetic and felt underlayment is minimal. While synthetic material costs a little more per roll, it covers a much larger area. In fact, it takes about three rolls of felt to match one roll of synthetic underlayment. That means fewer trips up the ladder, less time handling materials, and a faster overall installation.
When you factor in the reduced labor and higher performance, the cost and time nearly balance out. You may pay slightly more upfront for synthetic underlayment, but the long-term value far outweighs the small price difference.
Key Takeaway: Labor ends up being a wash between felt and synthetic, but the quality and durability of synthetic make it the better investment.
Why We Recommend Synthetic Underlayment
Our team consistently installs synthetic underlayment because it’s the better product overall. It resists tearing, stays secure under foot traffic, and supports the long-term performance of the roof. Compared to traditional felt, it provides a cleaner, safer installation and holds up longer under various conditions.
Although the initial cost is slightly higher, synthetic underlayment offers significant advantages in strength and protection. You also gain peace of mind knowing your roofing system qualifies for a full system warranty when combined with compatible shingles.
At Precision Roofing, this approach provides homeowners with the best balance of cost, performance, and warranty protection. It’s the better way to build a roof that lasts.
Ready to start your roof project? Contact Precision Roofing today to schedule a free quote. Our experts will install the right underlayment for shingles to give your home a stronger, longer-lasting roof.
