When the snow melts, this melted water runs down until it reaches the unheated bottom edge or soffit area of your roof. Once this melted water freezes, it becomes an ice dam. Without the proper roofing underlayment , ice dams can damage your roofing structure and walls.
Installing an ice and water shield allows the water to be drained safely off the roof, thus protecting your roof from damage. Wind-driven rain is linked to ice dam formation and may even increase the likelihood of it. The cause of wind-driven rain is usually a strong storm such as a hurricane. The wind can push rainwater to flow beneath your roofing shingles and create an ice dam. Having an ice and water shield installed may not entirely prevent this from happening, but it lessens the chances of a water leak significantly.
Felt paper provides decent performance in stopping leaks, and it does so with the help of gravity. In actuality, felt paper relies on gravity to allow water to flow over the felt paper and onto the edge of your roof. The drawback to using felt paper is if water travels horizontally or along the shaft.
On the other hand, an ice shield is a rubberized membrane that sticks to and adheres to your roof deck. Thanks to its self-adhesive feature, an ice and water shield stick to the roof sheathing, provide waterproofing, and protects your roof far more effectively. Felt paper is installed in stacks or layers of rows so that every higher row overlaps each row below. Since the ice and water protector carries a rubberized membrane, this creates a gasket effect on the nail shaft when the nails penetrate the shield.
Not all ice shields provide this feature, though. Grace Ice and water shield is one company that offers this type of product. One thing to note, though about installing ice and water protectors is the temperature and sunlight exposure. Temperatures that go above 60 degrees Fahrenheit with direct sunlight exposure cause the product to be extremely sticky.
The eaves and roof edges are especially vulnerable to ice dams and will form near the gutter. An ice and water protector is critical to have in these areas to help direct water into the gutter rather than penetrate through the nails and into your roofing structure.
Installing an ice and water protector is essential in these areas specifically to protect your roof from wind-driven rain. Skylights, which penetrate the roof deck, will also require an ice and water protector.
The amount of rubberized asphalt adhesive on the underside of the ice and water shield will determine how well it will seal down and protect your home against water intrusion. Cheaper versions of ice and water shield have much less asphalt adhesive on the back side and do not stick down nearly as well as the premium products like Owens Corning Weather Lock.
If you do get an ice and water shield product of the lesser quality installed onto your home and experience a severe ice dam on your home, you may find multiple leaks in your home — even though your new roof was technically installed according to code requirements. The cost of upgrading to high-quality ice and water shield is minimal when compared to the massive damage that could be caused without it. Or call us at Contact Us Online These locations tend to be… In every valley.
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. 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.
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. In colder regions, a good practice is to cover the first 3 feet 36 inches or 0. 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.
These spots are…. With the new roof over top there is 2 layers everywhere on the roof for water to get through before it gets into your home.
I had a few drips from under my eaves at my front door in front of enclosed porch.
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