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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. 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 as needed before

installing the membrane. (Refer to Tech Letter #5, Chemical Compatibility,

when installing over wood plank decks).

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 250–350  /gal (6–8

m /L). Priming is not required for other suitable surfaces provided that

they are clean and dry.

underlayment is backed by local technical support personnel that help

ensure every application goes smoothly.

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