What You Should Know About Roof Underlayment in Western New York

When it comes to roofing in Western New York, particularly in the snowy months, choosing the right materials can make all the difference. One of the most common questions I get from homeowners is: what’s the best underlayment for my roof? Specifically, should I use ice-and-water shield or felt underlayment in the valleys? Let’s break this down.

What is Roof Underlayment?

Roof underlayment is a protective layer installed beneath the final roof covering. It serves multiple purposes, including providing an additional barrier against water infiltration, acting as a vapor barrier, and helping to protect the roof deck from damage.

Ice-and-Water Shield: The Heavyweight Champion

Ice-and-water shield is a specialized underlayment that is particularly effective in areas prone to ice dams and heavy snow loads—like many of our neighborhoods in Buffalo and Niagara. This self-adhesive product adheres to your roof deck, creating a watertight seal that prevents water from seeping in, even if the shingles above get damaged or displaced.

• Pros:
  • Excellent protection against ice dams.
  • Adheres tightly to the deck, reducing the risk of water infiltration.
  • Ideal for valleys, eaves, and other vulnerable areas.
• Cons:
  • More expensive than felt underlayment.
  • Installation can be more complicated and time-consuming.

Felt Underlayment: The Classic Choice

Felt underlayment, often made from fiberglass or organic materials, has been the go-to choice for many years. It’s easier to install and generally less expensive than ice-and-water shield. However, it doesn’t provide the same level of protection against water intrusion.

• Pros:
  • Cost-effective and widely available.
  • Easier to install for many roofing contractors.
  • Provides basic protection against moisture.
• Cons:
  • Doesn't provide as strong a barrier against ice dams.
  • Can be more susceptible to tearing and water absorption if not properly installed.

So, What Should You Choose for Your Roof?

In Western New York, where our winters can be harsh and unpredictable, I often recommend using ice-and-water shield in valleys and at eaves. It’s not just a matter of cost; it’s about ensuring that your home is protected from water damage that could lead to costly repairs later on.

That said, felt underlayment can be a viable option in less critical areas or when budget constraints are a significant concern. The key is to balance cost and protection based on your specific roof design and local conditions.

The Bottom Line

When choosing underlayment, don’t just focus on the upfront costs. Consider the long-term benefits of safeguarding your home against water intrusion, especially given our unique climate challenges here in Buffalo and Niagara.

Before you spend a dollar on a roof in Western New York, get a professional opinion first. Scott Schlager is the area's only NRCIA Certified Roof Inspector, and his written roof inspection — normally $500 — is free. Call Green Shield Home Solutions at (716) 202-7663 to book yours.