GRACE ICE & WATER SHIELD® is a self-adhered roofing underlayment designed to provide an additional layer of protection against water intrusion in residential and commercial construction. Developed by Grace Construction Products, this underlayment has been a trusted solution for over 37 years, offering critical defense against ice dams, wind-driven rain, and other weather-related threats. Its proper installation is essential to ensure long-term performance and structural integrity of the roof system.
This article provides a detailed overview of the installation methods, key specifications, and best practices for applying GRACE ICE & WATER SHIELD® underlayment. The focus is on the two primary installation techniques—the conventional method and the back-roll method, both of which are described in manufacturer documentation and project guides from industry experts. These methods are tailored for contractors and DIY professionals seeking reliable and efficient ways to install this critical roofing component.
The following sections will explore the installation process, minimum overlap requirements, and additional considerations such as alignment, pressure application, and removal of the release liner. Emphasis is placed on the technical aspects of the product and the importance of adhering to manufacturer guidelines to maximize protection and durability.
Installation Methods for GRACE ICE & WATER SHIELD®
There are two recommended methods for installing GRACE ICE & WATER SHIELD®: the conventional method and the back-roll method. Both are outlined in detail in the source documentation and are intended to provide flexibility for contractors based on their experience and project requirements.
The Conventional Method
The conventional method involves cutting the membrane into manageable lengths and applying it manually using hand pressure. This method is ideal for smaller projects or when precision is required in areas such as eaves, valleys, skylights, and chimneys.
Cutting and Re-Rolling:
The membrane should be cut into lengths between 10 and 15 feet (3 to 5 meters). These lengths are then loosely re-rolled to maintain flexibility during installation.Peeling Back the Release Liner:
A section of 1 to 2 feet (300 to 600 mm) of the release liner should be peeled back to expose the adhesive surface. This allows for proper alignment of the membrane with the roof surface.Alignment and Adhesion:
Once aligned, the release liner is peeled away from the membrane, and the material is pressed into place using heavy hand pressure. This ensures strong adhesion to the roof deck.Overlap Guidelines:
The manufacturer specifies minimum overlap requirements. Side laps must be at least 3.5 inches (90 mm), and end laps must be at least 6 inches (150 mm). These overlaps ensure continuous coverage and prevent water from seeping through the seams.Smoothing and Final Application:
During the installation, it is important to press the membrane firmly toward the outer edge, smoothing out any wrinkles or air bubbles. Once a roll is fully applied, the remaining release liner should be removed to complete the installation.
The Back-Roll Method
The back-roll method is a faster alternative to the conventional method and is preferred by some contractors for its efficiency. This technique allows the membrane to be laid down in a few minutes, reducing labor time without compromising quality.
Unrolling the Membrane:
A 10 to 15-foot (3 to 5-meter) piece of membrane is unrolled, with the release liner still intact. The membrane is aligned in the direction of the intended application.Cutting the Release Liner:
The top of the release liner is carefully cut in the cross direction using a utility knife or similar tool. It is essential to avoid cutting the membrane itself.Peeling and Exposing the Adhesive:
Approximately 6 inches of the release liner is peeled back in the opposite direction of the intended membrane application. This exposes the black adhesive surface, which is critical for adhesion to the roof deck.Rolling and Applying the Membrane:
The contractor holds the release liner with one hand and pulls the roll along the roof deck using the release liner as a guide. As the roll is pulled forward, the membrane is left behind, adhering to the surface.Smooth Application and Final Pressing:
After the membrane is laid, it is important to press it firmly into place to ensure full contact with the roof surface. This step helps eliminate any air pockets or misalignment.
Key Installation Considerations
Regardless of the chosen method, there are several key considerations that must be followed to ensure the effectiveness of GRACE ICE & WATER SHIELD® as a roofing underlayment.
1. Surface Preparation
The roof deck must be clean, dry, and free from debris before the membrane is applied. Any dirt, dust, or moisture can interfere with adhesion and reduce the long-term performance of the underlayment.
2. Environmental Conditions
Installation should be performed in suitable weather conditions. The manufacturer recommends avoiding installation in extreme temperatures or high humidity, as these can affect the adhesive properties of the material. Ideal conditions include moderate temperatures and low humidity levels.
3. Safety and Protection
Contractors should take appropriate safety precautions, including wearing gloves and eye protection when handling the membrane. The adhesive surface can be sticky and may cause irritation if it comes into contact with skin.
4. Alignment and Positioning
Proper alignment is crucial for both methods. The membrane should be positioned to cover key areas of the roof, including eaves, valleys, and other vulnerable spots where water is likely to accumulate. This helps prevent leaks and water damage over time.
5. Removal of the Release Liner
After the membrane is adhered, the remaining release liner should be removed promptly. Leaving the liner in place can cause the membrane to shift or lose adhesion over time.
Performance Benefits of GRACE ICE & WATER SHIELD®
GRACE ICE & WATER SHIELD® is designed to offer long-term protection against water intrusion. The self-adhering membrane forms a durable and flexible barrier that conforms to the roof surface, creating a watertight seal.
One of the key advantages of this product is its ability to prevent ice dam formation. Ice dams occur when snow melts on the upper portion of the roof and refreezes at the eaves, creating a barrier that traps water. This trapped water can seep under the shingles and cause interior damage. GRACE ICE & WATER SHIELD® helps prevent this by providing a protective layer that redirects water away from vulnerable areas.
In addition to ice dam protection, the product is also effective in resisting wind-driven rain, which can penetrate conventional roofing systems. Its high-strength adhesive ensures that the membrane remains firmly in place, even under harsh weather conditions.
Long-Term Cost Savings
Proper installation of GRACE ICE & WATER SHIELD® can lead to significant cost savings for homeowners. By preventing water intrusion and reducing the need for reroofing, the product helps extend the lifespan of the roof. According to the manufacturer documentation, a properly installed underlayment can save homeowners up to $18,000 in reroofing costs over time.
Conclusion
GRACE ICE & WATER SHIELD® is a reliable and effective roofing underlayment that offers critical protection against water intrusion. When installed according to manufacturer guidelines, it can significantly enhance the durability and longevity of a roof system. The two primary installation methods—conventional and back-roll—provide flexibility for contractors and DIY professionals, allowing them to choose the most suitable approach based on project requirements.
Key steps in the installation process include cutting the membrane into manageable lengths, peeling back the release liner, applying the membrane with heavy hand pressure, and ensuring minimum overlap requirements are met. Additional considerations such as surface preparation, environmental conditions, and safety precautions are also essential for achieving optimal results.
By following these guidelines, professionals can ensure that GRACE ICE & WATER SHIELD® performs as intended, providing long-term protection against ice dams, wind-driven rain, and other weather-related threats. The product’s proven track record and reliability make it a preferred choice for building professionals who prioritize quality and performance in their projects.