Grace Ice & Water Shield®

Grace Ice And Water Shield® Is the roofers preferred underlayment in extreme climate areas such as the northern states, where winters are very harsh and 4-6 ft snow drifts are quite common on every roof.

The leading self-adhered roofing underlayment, Grace Ice & Water Shield offers premium leak protection for sloped roofs in climates subject to ice dams and wind-driven rain. It is applied to the roof deck prior to the application of the finished roof covering, which is most often shingles but can also be tile or metal. The membrane goes under shingles and seals around nails that hold the shingles in place, so water that doesn't drain properly cannot penetrate the roof. It also creates a weather-tight barrier against wind-driven rains that cause shingles to lift and leak. Affordable and easy to install, it provides added peace of mind for many years, even in the most brutal winters.

Ice Dams: Grace Ice & Water Shield should be used in conjunction with designs which minimize ice dam formation.

In cold climates
It is particularly important to provide proper insulation and ventilation to reduce the size of ice dams and to avoid interior condensation.

Ventilation
Cathedral ceilings must include ventilation (1" Air Space) between rafters to allow for air flow to a ridge vent. Well ventilated cold roof designs are particularly important in alpine regions to reduce the size of ice dams which could contribute to structural damage.

Several variables will influence the height of ice dams and the membrane coverage required.

• Climate—The annual snow fall will affect the amount of membrane needed.
• Slope—On a low slope, ice dams will extend farther inward from the roof edge.
• Overhang—A wide overhang will require more membrane to reach the appropriate point on the roof.
• Insulation and ventilation—A very well insulated building with a cold, well ventilated attic will have smaller ice dams.
• Valleys—Any valleys formed by projections such as dormers or roof direction changes are likely to trap more snow and cause larger ice dams.
• Exposure—A northern exposure or shaded areas will generally contribute to larger ice dams.

In General: 24" inside the exterior wall(typically 6ft complete perimeter), 12" around every penetration, 36" in every valley, At least 4" up wall intersections and 24" onto Roof Decking
Local building codes should be consulted for specific requirements.

Ice Dams:
While gutters may make it easier for an ice dam to start, large dams can occur on roofs with no gutters. Removing snow from a roof edge or installing heat cables may not prevent ice dam formation, but may shift the location of the ice dam. Under certain conditions, a dam can form at the edge of the remaining snow.

Product Data

	2.25 Sq Roll	1 Sq Roll
Roll length	75 ft (22.9 m)	36 ft (11.0 m)
Roll width	36 in. (914 mm)	36 in. (914 mm)
Roll size	225 ft2 (20.9 m2)	108 ft2 (10.4 m2)
Packaging	Corrugated cartons	Corrugated cartons
Roll weight	61.4 lbs (27.9 kg)	33.6 lbs (15.3 kg)

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