Ice and water protector, sometimes also referred to as ice and water shield, is a waterproof roof underlayment membrane developed to protect vulnerable areas on a roof from ice and water damage. Ice and water protectors (sometimes called ice and snow shields in cold climates) are made with polymer-modified bitumen.
The adhesive back surface of the membrane will bond to the roof deck, which is a superior underlayment for areas where ice dams or severe storms are common.
Ice and water protector products have a modified bitumen adhesive back surface that is covered by a release film. The film is removed during application so that the membrane will adhere to the roof deck and also form watertight end laps and side laps when properly applied. The modified bitumen is designed to form a watertight seal around the nail penetrations when shingles are applied.
A safety feature of these membranes is a slip-resistant top surface for better traction during installation. Potentially, covering an entire roof with ice and water protector can prevent leaks even after high wind conditions blow shingles off the roof—preventing further damage and making repair easier. However, because the modified bitumen back surface is continuous, these membranes can result in a vapor barrier. Should a homeowner decide to cover the entire roof with ice and water protector, it is even more important to consider proper attic ventilation carefully.
Two of IKO’s ice and water protector products, GoldShieldTM and ArmourGardTM act as water retardants and achieve a superior moisture transmission rate of fewer than 0.5 perms. This measurement describes the material’s permanence, or how many grains of water can pass through the material in an hour at a certain level of water pressure. Canada’s National Roofing Contractors Association classifies any material with 0.5 perms or less as a vapor retarder. In fact, contractors can use ArmourGard as an exterior vapor barrier for foundations or basements.
In strong storm situations, such as hurricanes, the wind can push rainwater beneath the shingles. The ice and water protector membrane, fully adhered to the roof deck, greatly lessens the chance of the wind-driven rain causing a leak.
The American National Flood Insurance Program does not cover wind-driven rain, according to FEMA. Standard private homeowners’ insurance policies also may not cover wind-driven rain. So, protection from this risk should be a paramount concern both when shopping for insurance and when protecting your roof.
Ice dams are a serious issue for homeowners and roofing professionals in cold climates, or even where occasional snow may fall. Ice dams are formed by the continuous melting and freezing of snow due to heat escaping from the house, or from a backup of frozen slush from the rain gutters. The melted water flows under the snow and freezes as it reaches the unheated soffit area at the eaves, thus creating an ice dam. When this occurs, water can be forced under the shingles and into the attic, resulting in damage to the home’s interior. Ice and water protector membranes are a time-tested and effective solution to help with this problem.
Ice and water protector is recommended for low-slope areas and valleys because these roof areas are particularly vulnerable. Homeowners are encouraged to check their local building code as some jurisdictions will have different requirements for use.
The key component of roof ice and water protector is polymer-modified bitumen (also known as asphalt). A common feature of most ice and water protectors is the advantage of self-sealing around roofing nails. This feature greatly reduces the possibility of leaks occurring when ice or storms force water underneath the shingles.
GoldShield™, ArmourGard™ and StormShield® are all made with polymer-modified bitumen. IKO’s ArmourGardTMand StormShield® have a tough, nonwoven, glass fiber mat. Sand and/or mineral matter is applied to the top to form a slip-resistant surface. GoldShieldTM uses a special slip-resistant polymer membrane for the top surface.
In order to calculate your ice and water protector needs, you need to know what width of ice and water protector you need, and the length of the roof that you need to cover. First, there are a few factors that determine the width you will require.
Ice and water protector must reach above the highest expected level of ice dams, which will vary by region and the slope of your roof. The minimum is typically 2 feet (24 inches or 0.60 m) above the vertical projection of the inside of the exterior wall. In colder regions, a good practice is to cover the first 3 feet (36 inches or 0.91 m) of roof over heated space with ice and water protector. All overhangs should also be covered.
In many northern states and provinces, your local building codes will mandate a minimum width of ice and water protector around your eaves, valleys or other features. Sometimes, they may demand more than 3 feet of coverage. Most ice and water protector products are 3 feet wide. Therefore, if you need 4 feet of coverage, you need to use two full courses of ice and water protector to meet the requirements, even though this will end up covering almost 6 feet.
As for length, you’ll have to measure the roof in question. The length and coverage of a roll of ice and water protector will vary by manufacturer. GoldShield™ is 66.7 feet long (19.9 meters), and one package has an area of 200 square feet (19.58 meters).
Ice and water protector membrane is a superior choice over roof felt for leak protection when properly installed and paired with the right products. Ice and water protector is part of a system working together to protect your roof, including the shingles and other underlayments.
To learn more about water and ice protector, or to have it installed on your roof, please visit our Contractor Locator to find a local roofer in your area.
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