Do You Need Ice & Water Shield?

When replacing or repairing a roof in Oshkosh or anywhere in the Midwest, one of the most important decisions you’ll make is whether to install ice and water shield. While some homeowners see it as optional, Wisconsin’s building code—and our extreme weather—suggest otherwise.

At Rutter’s Roofing, we don’t just follow code—we install roofing systems that are built to last through harsh winters, snowmelt cycles, and sudden temperature swings. Here’s what you need to know about ice and water shield, when it’s required, and why it’s a smart investment for protecting your home.

What Is Ice & Water Shield?

Ice and water shield is a self-adhering waterproof membrane installed under shingles, typically along roof edges, valleys, and other vulnerable areas. It serves as an extra layer of protection against water intrusion caused by ice dams, wind-driven rain, and snowmelt.

Unlike traditional underlayment, which may wrinkle or tear over time, ice and water shield bonds directly to the roof deck and self-seals around nails. That means water has a much harder time finding its way in—even under extreme weather conditions.

Why It’s Critical in Wisconsin

In a region like Oshkosh, roof damage from ice dams is one of the most common winter-related problems we see. Ice dams form when heat from inside the home melts snow on the roof, which then refreezes near the eaves. Water trapped behind the ice pushes under the shingles and leaks into your home—often unnoticed until ceilings are stained, insulation is soaked, and drywall begins to sag.

Ice and water shield acts as your last line of defense, keeping that meltwater from reaching the roof deck and interior structure.

What Does Wisconsin Roofing Code Require?

According to the Wisconsin Uniform Dwelling Code (UDC), ice and water shield is required:

• From the eave edge up at least 24 inches inside the exterior wall line of the structure.
• In valleys and areas prone to ice damming.
• On low-slope roofs where water runoff is slower.

This means that ice and water shield is not optional for most homes in our region—it’s required by law for new roof installations and many replacements. Failing to meet these standards can lead to failed inspections, denied insurance claims, and costly future repairs.

At Rutter’s Roofing, we go beyond the minimum by installing shield in multiple critical zones, not just the bare minimum dictated by code.

Should You Use Ice & Water Shield on the Entire Roof?

While it’s not always necessary to apply it across the entire roof surface, in certain cases—especially low-pitch roofs, complex designs, or high-exposure locations—a full-coverage approach may be worth the added investment.

Some homeowners also choose full coverage for peace of mind, particularly in older homes or homes with interior features sensitive to moisture (vaulted ceilings, exposed beams, etc.).

Our team provides clear recommendations based on slope, architecture, insulation, and airflow—because what works on one home might be overkill or inadequate for another.

Protect Your Home from the Top Down

If you’re planning a roof replacement or repair, don’t overlook the importance of proper waterproofing beneath the shingles. Ice and water shield is more than a line item on your estimate—it’s a crucial safeguard against leaks, rot, mold, and structural damage.

At Rutter’s Roofing, we’re committed to doing the job right the first time, with quality materials and proper code-compliant installation. Serving homeowners in Oshkosh and across East-Central Wisconsin, we understand how to build roofs that withstand Midwest winters—and how to keep your home dry no matter the season.

Call us today to schedule your roof inspection or request a detailed estimate. We’ll walk you through your options and ensure your new roof is ready for whatever Wisconsin weather throws its way.