GRACE ICE & WATER SHIELD®

Product Description

Grace Ice & Water Shield membrane is composed of two waterproofing materials - an aggressive rubberised asphalt adhesive backed by a layer of high density, cross-laminated polyethylene. The rubberised asphalt surface is backed with a release paper that protects the adhesive quality. During application, the release paper is removed allowing the compound to bond tightly to the plywood deck. The membrane is supplied in 20m rolls, 1m in width.

Product Advantages

• Easy to handle and apply
• Foldless release paper
• Seals around nails
• Dual barrier protection
• Membrane will not crack, dry out or rot
• Protects under all standard sloped roof coverings
• Slip-resistant surface
• Proven track record
• Re-roofable
• GCP technical support

Features & Benefits

• Easy to handle and apply – The self-adhesive membrane bonds firmly to the roof deck without heat or special adhesives.
• Foldless release paper – The foldless release paper provides multiple performance enhancements: fewer edge catches, 180° pull-back, ease of membrane cutting (single cuts) and membrane positioning, quicker “one-man installs” resulting in an easier, more productive release.
• Seals around nails – The rubberised asphalt layer in Grace Ice & Water Shield seals around roofing nails, resisting leakage caused by water back-up behind ice dams, or from wind-driven rain.
• Dual barrier protection – Rubberised asphalt and polyethylene are combined to form two waterproofing barriers providing maximum protection.
• Membrane will not crack, dry out or rot – Grace Ice & Water Shield resists attacks from fungus and bacteria; maintains its integrity for long-lasting protection.
• Protects under all standard sloped roof coverings – Grace Ice & Water Shield protects under slate, tile, cedar shakes or metal, as well as under conventional asphalt shingles.
• Slip-resistant surface – Grace Ice & Water Shield has a slip-resistant, embossed surface to maximise traction and safety for applicators.
• Proven track record – Grace Ice & Water Shield is the name brand in roofing underlayments with a 30-year track record of protecting roofs from ice dams and wind-driven rain.
• Re-roofable – Unlike some granular surfaced membranes, Grace Ice & Water Shield will not adhere to the underside of the exposed roof covering. Grace Ice & Water Shield can be applied over the old underlayment (except over BASIK®) in retrofit applications, making reroofing easier, less costly (since there is no need for removing the existing underlayment), more durable and environmentally friendly (as the structural deck remains intact avoiding the need to purchase additional wood decking).
• GCP technical support – Grace Ice & Water Shield is backed by a team of local technical support personnel that help ensure every application goes smoothly.

Physical Properties

_{* Nominal thickness refers to the thickness of the membrane without release liner.
** Typical test values may represent average values from samples tested. Test methods noted may be modified. The test is run at a rate of 50mm per minute.}

Installation Procedure

Surface Preparation

Install Grace Ice & Water Shield directly on a clean, dry, continuous structural deck. Some suitable deck materials include plywood, wood composition, wood plank, metal, concrete, or gypsum sheathing. Remove dust, dirt, loose nails, and old roofing materials. Protrusions from the deck area must be removed. Decks shall have no voids, damaged, or unsupported areas. Wood planks should be closely butted together. Repair deck areas before installing the membrane.

Prime concrete, masonry surfaces and DENSGLASS GOLD® with PERM-A-BARRIER® WB Primer. Prime wood composition and gypsum sheathing with Perm-A-Barrier WB Primer if adhesion is found to be marginal (refer to Technical Letter 12, Use on Oriented Strand Board (OSB) Roof Sheathing). Apply Perm-A-Barrier WB Primer at a rate of 6 to 8m² / L. Priming is not required for other suitable surfaces provided that they are clean and dry.

Membrane Installation

Apply Grace Ice & Water Shield in fair weather when the air, roof deck, and membrane are at temperatures of 5°C or higher. Apply roof covering material at temperatures of 5°C or higher 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 directly over the old underlayment in retrofit applications following the standard membrane application procedure.

Cut the membrane into 3 to 5m lengths and reroll loosely. Peel back 300 to 600mm 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 90mm and end laps a minimum of 150mm. For valley and ridge application, peel the release liner, centre the sheet over the valley or ridge, drape, and press it in place. Work from the centre 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 1 to 2m 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 150mm 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, re-roll 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 90mm side lap.