Roof valleys play a critical role in the overall performance of any roof. They are the channels where two slopes meet, naturally directing large amounts of water and melting snow toward gutters and drainage points. Because valleys carry so much runoff, they are also among the most vulnerable areas of a roofing system. Without proper protection, these spots can quickly become a source of leaks and costly damage for both residential and commercial properties. One of the most effective ways to safeguard valleys is learning the importance of ice and water shields.

What is an Ice and Water Shield? 

An ice and water shield is a self-adhering waterproof membrane that is applied directly to the roof deck, underneath shingles or other roof coverings. Unlike standard underlayment, this material creates a watertight seal that adheres around fasteners and resists moisture infiltration. As a result, the shield provides an additional layer of protection where your roof needs it most. 

Protection Against Ice Dams 

In climates that experience snow and freezing temperatures, ice dams are a common problem. Ice dams form when heat from a property causes snow on the roof to melt. The melted water then flows down to the colder roof edges and refreezes. Over time, this ice buildup forces water to back up beneath the shingles. The result can be leaks, interior water damage, and even structural rot. In Downtown Des Moines, properties near Court Avenue, the East Village, and around Casey’s Center a often face heavy runoff during storms. By placing ice and water shields in valleys and along roof edges, property owners gain an essential line of defense. The shield prevents water from seeping into the decking, reducing the risk of major repair needs and helping preserve everything from historic brick buildings to newer developments along Locust Street.

Defense From Wind-Driven Rain 

Even in regions without heavy snowfall, roofs are still exposed to severe storms. Wind-driven rain can easily push water beneath shingles, particularly in valleys where water naturally concentrates. Because an ice and water shield bonds tightly to the roof deck, it stops rain from entering vulnerable seams and nail holes. This helps maintain the integrity of your roofing system even under the most challenging weather conditions. 

Extending the Life of Your Roof 

Moisture intrusion is one of the fastest ways to shorten the lifespan of a roof. When water seeps past the shingles and into the decking, it can lead to mold growth, wood rot, and insulation damage. Over time, these issues compromise structural stability and may result in higher energy bills. In Des Moines, where winters bring snow and ice followed by heavy spring rains, roofs face extra pressure from moisture. Installing ice and water shields helps minimize these risks by keeping water out of the system altogether. In turn, property owners across Des Moines and surrounding communities like West Des Moines, Ankeny, and Urbandale can expect longer roof performance and fewer maintenance expenses over the years.

Professional Installation Matters 

Although the material itself is highly effective, proper installation is the key to success. Ice and water shields must be applied directly to the roof deck, with precise overlaps and careful sealing around penetrations such as chimneys, skylights, and vents. When handled by an experienced contractor, these details ensure that the barrier performs as intended.  

Invest in Long-Term Protection 

Understanding the importance of ice and water shields, it’s clear that this relatively small investment pays significant dividends in protection and peace of mind. This addition can prevent unexpected repairs and preserve the integrity of your roofing system for years to come. If you want to make sure your property is properly protected, Aspen Contracting is here to help. Schedule an inspection today by calling 877-784-ROOF or visiting roofsbyaspen.com. Our experienced team will assess your roof, recommend the right solutions, and install with higher standards and integrity.