Product Brochure

ManualsBrandsGCP Applied Technologies ManualsBuilding materials36 in. x 75 ft. (225 sq. ft.) Ice and Water Shield Roll Roofing Underlayment in Black

Product Description

Grace Ice & Water Shield self-adhered rooﬁng underlayment is a premier

membrane composed of two waterprooﬁng materials—an aggressive

rubberized asphalt adhesive backed by a layer of slip resistant coated high

density cross laminated polyethylene ﬁlm. The rubberized asphalt surface

is backed with a foldless release paper that protects its adhesive quality.

During application, the release paper is easily removed, allowing the

rubberized asphalt to bond tightly to the roof deck. The Ripcord

embedded in the adhesive provides the applicator a “split release on

demand” feature.

Grace Ice & Water Shield is a versatile underlayment material that may be

used on sloped roofs, under mechanically attached roof coverings such as

asphalt shingles, slate, tile, cedar, and standing seam metal in many climate

and assembly conditions (see limitations for additional information).

Grace Ice & Water Shield is supplied in 3  wide rolls of varying lengths.

Membrane strips are also available in 75  (22.9 m) long rolls at widths of

6 in. (150 mm), 9 in. (225 mm), 12 in. (300 mm) and 18 in. (450 mm).

See the Product Data chart for product information.

Features & Beneﬁts

Guidelines for Use

Grace Ice & Water Shield rooﬁng membrane is used as an underlayment

for sloped roofs to resist water penetration due to water back-up behind

ice dams or wind-driven rain. Grace Ice & Water Shield underlayment also

oﬀers leak protection in trouble prone spots like valleys, skylights,

protrusions and other ﬂashing areas.

Ice Dams

Grace Ice & Water Shield rooﬁng underlayment should be used in

conjunction with roof designs that 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. Cathedral ceilings must include ventilation between raers

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.

Grace Ice & Water Shield

The original, best-in-class, self-adhered rooﬁng underlayment

Seals around fasteners — The rubberized asphalt layer in Grace Ice &

Water Shield membrane seals around fasteners, resisting leakage

caused by water back-up behind ice dams, or from winddriven rain.

Superior Adhesion to the Deck — The self-adhesive membrane bonds

ﬁrmly to the roof deck without need for heat or special adhesives.

Watertight Laps — Membrane easily forms water-tight overlaps

without special treatment.

Protects under all standard sloped roof coverings — Grace Ice & Water

Shield rooﬁng underlayment protects under slate, tile, cedar shakes

or metal, as well as under conventional asphalt shingles.

Proven track record — Grace Ice & Water Shield rooﬁng

underlayment is the name brand in rooﬁng underlayments with a track

record of more than 35 years protecting roofs from ice dams and

wind-driven rain.

Ripcord — Split Release on demand feature makes Grace Ice & Water

Shield underlayment easier to apply. Faster application of the

membrane in the straight-aways, as well as ease of membrane

positioning in detail areas (valleys, around dormers, etc.).

Slip resistant surface — Grace Ice & Water Shield self-adhered

membrane has a slip resistant embossed surface to maximize traction

and safety for applicators.

Reroofable — Unlike granular surfaced membranes, Grace Ice & Water

Shield smooth surface underlayment will not adhere to the underside

of the exposed roof covering. Grace Ice & Water Shield membrane

can be applied over the old GCP self-adhered underlayment in retroﬁt

applications, making re-rooﬁng easier, less costly (since there is no

need to remove the existing underlayment), more durable and

environmentally friendly (as the structural deck remains intact avoiding

the need to purchase additional wood decking).

Membrane will not crack, dry out or rot — Grace Ice & Water Shield

rooﬁng underlayment resists attacks from fungus and bacteria;

maintains its integrity for long lasting protection.

Local technical support — Grace Ice & Water Shield rooﬁng

underlayment is backed by local technical support personnel that help

Climate — The annual snow fall will aﬀect the amount of membrane

needed.

11..

Slope — On a low slope, ice dams will extend farther inward from

the roof edge.

22..

Overhang — A wide overhang will require more membrane to reach

the appropriate point on the roof.

33..

Insulation and ventilation — A very well insulated building with a

cold, well ventilated attic will have smaller ice dams.

44..

Valleys — Any valleys formed by projections such as dormers or roof

direction changes are likely to trap more snow and cause larger ice

dams.

55..

Exposure — A northern exposure or shaded areas will generally

contribute to larger 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 shi the location of the ice

dam. Under certain conditions, a dam can form at the edge of the

remaining snow. Local building codes should be consulted for speciﬁc

requirements.

66..

Product Data Sheets

Summary of content (5 pages)

PAGE 1
Product Data Sheets Grace Ice & Water Shield ® The original, best-in-class, self-adhered rooﬁng underlayment Product Description Guidelines for Use Grace Ice & Water Shield ® self-adhered rooﬁng underlayment is a premier membrane composed of two waterprooﬁng materials—an aggressive rubberized asphalt adhesive backed by a layer of slip resistant coated high density cross laminated polyethylene ﬁlm. The rubberized asphalt surface is backed with a foldless release paper that protects its adhesive quality.
PAGE 2
Product Data Sheets underlayment is backed by local technical support personnel that help ensure every application goes smoothly. Installation Procedure Surface Preparation Install Grace Ice & Water Shield ® rooﬁng underlayment directly on a clean, dry, continuous structural deck. Some suitable deck materials include plywood, wood composition, wood plank, metal, concrete, and gypsum sheathing. Prior to membrane application, remove dust, dirt, loose nails, and old rooﬁng materials.
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Product Data Sheets Membrane Installation Apply Grace Ice & Water Shield ® underlayment in fair weather when the air, roof deck, and membrane are at temperatures of 40°F (5°C) or higher. Apply roof covering material at temperatures of 40°F (5°C) or higher. Cut the membrane into 10–15 (3–5 m) lengths and reroll loosely. Peel back 1–2 (300–600 mm) of release liner, align the membrane, and continue to peel the release liner from the membrane. Press the membrane in place with heavy hand pressure.
PAGE 4
Product Data Sheets Precautions & Limitations Slippery when wet or covered by frost. Consistent with good rooﬁng practice, always wear fall protection when working on a roof deck. Release liners are slippery. Remove from work area immediately a er membrane application. Do not leave permanently exposed to sunlight. Cover within 90 days. Place metal drip edges or wood starter shingles over the membrane.
PAGE 5
Product Data Sheets Last Updated: 2017-12-13 gcpat.