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

Product Data

Roll length 75  (22.9 m) 66.6  (20.2 m) 36  (11.0 m)

Roll width 36 in (914 mm) 36 in (914 mm) 36 in (914 mm)

Roll size

225 2 (20.9

m )

200  (18.6

m )

108  (10.4

m )

Packaging

Corrugated

cartons

Corrugated

cartons

Corrugated

cartons

Roll weight

61.4 lbs (27.9

kg)

55 lbs (24.9 kg)

33.6 lbs (15.3

kg)

Rolls per

pallet

35 35 25

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. Side laps must be a minimum of 3.5 in.

(90 mm) and end laps a minimum of 6 in. (150 mm). For valley and ridge

application, peel the release liner, center the sheet over the valley or ridge,

drape, and press it in place. Work from the center of the valley or ridge

outward in each direction and start at the low point and work up the roof.

Alternatively, starting with a full roll of membrane, unroll a 3–6  (1–2 m)

piece of membrane leaving the release liner in place. Align the membrane

and roll in the intended direction of membrane application. Carefully cut

the release liner on top of the roll in the cross direction being careful not

to cut the membrane. Peel back about 6 in. (150 mm) of the release liner

in the opposite direction of the intended membrane application exposing

the black adhesive. Hold the release liner with one hand and pull the roll

along the deck with the release liner, leaving the applied membrane behind.

Use the other hand to apply pressure on the top of the roll. Stop

frequently to press the membrane in place with heavy hand pressure.

When ﬁnished with the roll go back to the beginning, reroll and pull the

remaining release paper from the material, ﬁnishing the installation.

For successive membrane courses, align the edge of the release liner with

the dashed line provided on the surface of the membrane to achieve the

3.5 in. (90 mm) side lap.

Consistent with good rooﬁng practice, install the membrane such that all

laps shed water. Always work from the low point to the high point of the

roof. Apply the membrane in valleys before the membrane is applied to the

eaves. Following placement along the eaves, continue application of the

membrane up the roof. The membrane may be installed either vertically or

horizontally.

Use smooth shank, electro-plated galvanized nails for fastening shingles to

get the best seal. Hand nailing generally provides a better seal than power-

activated nailing. If nailing of the membrane is necessary on steep slopes

during hot or extreme cold weather, backnail and cover the nails by

overlapping with the next sheet.

Extend the membrane on the roof deck above the highest expected level

of water back-up from ice dams and above the highest expected level of

snow and ice on the wall sheathing on vertical side walls (dormers) and

vertical front walls for ice dam protection. Consider a double layer of

membrane in critical areas, such as along the eaves or in valleys and in

climates where severe ice dams are anticipated. Apply the membrane to

the entire roof deck for wind-driven rain protection. Apply a new layer of

Grace Ice & Water Shield underlayment directly over the old GCP self-

adhered underlayment (except GCP granular underlayments) in retroﬁt

applications following the standard membrane application procedure.

Product Data Sheets