Where is ice and water shield required?

At eaves in cold climates (avg Jan temp 25F or below), in valleys, and around penetrations. Many codes also require it at rakes.

Can I use it on the entire roof?

Yes but it is expensive and the roof will not breathe. Most roofers use it at vulnerable areas and synthetic underlayment elsewhere.

Do I still need underlayment over it?

Not where ice shield is applied. Use underlayment on the rest of the roof, overlapping onto the ice shield by at least 2 inches.

Ice & Water ShieldGenerating image…

Roofing

Protection

$80-$150 per roll

Ice & Water Shield: Self-Adhering Roof Protection (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 15, 2026|Sources & methodology

Ice and water shield is a self-adhering rubberized asphalt membrane applied to vulnerable roof areas to prevent leaks from ice dams, wind-driven rain, and standing water. It seals around nail penetrations and creates a waterproof barrier at eaves, valleys, and around roof penetrations.

Key Features

Self-adhering rubberized membrane; Seals around nail penetrations; Waterproof barrier; Required in ice dam regions; Split-release backing

Specifications

Width: 36 in. Length: 65-75 ft per roll. Coverage: ~2 squares per roll. Thickness: 40-60 mil. Temperature range: apply above 40F.

Applications

Eaves in cold climates; Roof valleys; Around chimneys and skylights; Low-slope transitions; Vulnerable roof areas

Installation Overview

Apply to clean dry deck starting at eave line. Peel release backing and press firmly. Extend minimum 24 inches past interior wall line. Overlap seams 3-4 inches. Cover with roofing material promptly.

Pros & Cons

Pros

✓ Waterproof barrier; Self-seals around nails; Prevents ice dam leaks; Easy self-adhering install; Long service life

Cons

✗ Expensive per square foot; Cannot be left exposed long; Difficult to remove; Temperature-sensitive application; Sticky to work with

Top Brands

GAF

CertainTeed

Owens Corning

Grace

Code Requirements

Required per IRC R905.2.7.1 in areas where average January temp is 25F or below. Must extend minimum 24 inches past interior wall line at eaves. Required in valleys per many local codes.

Buying Tips

Do not skimp on coverage at eaves - extend well past the interior wall line. Buy extra for valleys and penetrations. Store rolls upright to prevent sticking.