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Ice and Water Shield Roofing Underlayment
Ice and Water Shield Protects Homes from Roof
Water Penetration
By Mark J. Donovan
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Ice and water shield roof
underlayment is a type of material that is specially designed to protect
homes with sloped roofs. Ice and water shield membranes are ideal for
climates where ice dams and wind driven rain can potentially work up and
underneath roofing shingles. In addition, ice and water shield roofing
underlayment seals around roofing nails that hold roof shingles in place. As
a result, water that may work its way up and under roof shingles is
prevented from reaching the roof sheathing. |
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Ice and water shield is a self
adhering roof underlayment that is installed on the roof sheathing prior to
installing the final roofing material, e.g. shingles, tiles or metal
roofing. It is typically installed near the bottom edge of the roof line, as
well as in roof valleys and around chimneys and other roof protrusions.
Ice and water shield comes in 3’
wide rolls of various lengths. Some local building codes only require 3’ of
water shield around the roof eaves, however ice and water shield is
relatively inexpensive compared to water damage in your home, so it is wise
to install a second course. |
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Make sure you
install the upper course last and that it overlaps the lower course by 3
inches to insure a perfect seal. Also, make sure the lower course overlaps
the top of the drip edge.
When installing
ice and water shield roofing underlayment in valleys, make sure it extends
up and out of the valleys by 18” on either side.
Also, when
installing ice and water shield up against any intersecting walls or roof
edges make sure it goes up the walls or roof edges by 4”.
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To actually install ice and water
shield, simply peal the plastic backing off of it and lay it on the roof
sheathing. It is extremely sticky material and will adhere well to the roof
sheathing in most cases. Roofing nails or staples are not necessary in most
situations. If installing during hot summer days you are best advised to install
it in the early morning before the heat makes it so sticky that it is nearly
impossible to handle. If installing ice and water shield during cold weather you
may need to use a few nails to hold it in place. However, use as few as
possible.
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