SURFACE PREPARATION -79200011

2.4.4

Neoprene

[_____] Neoprene backing shall be ASTM D 1056, [closed cell expanded

neoprene cord Type 2, Class C, Grade [2C2] [_____]] [open cell neoprene

sponge Type 1, Class C, Grade [1C3] [_____]].

2.5

CAULKING

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NOTE: The term "caulking" is limited herein to oil-

and resin-based caulking which should be used only

indoors and where there is little or no anticipated

joint movement. Use a sealant where joints may move.

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[_____] Oil- and resin-based caulking shall be ASTM C 570, Type [_____],

Use [_____].

2.6

CLEANING SOLVENTS

Provide type(s) recommended by the sealant manufacturer [except for

aluminum and bronze surfaces that will be in contact with sealant].

PART 3

EXECUTION

3.1

SURFACE PREPARATION

Surfaces shall be clean, dry to the touch, and free from dirt frost,

moisture, grease, oil, wax, lacquer, paint, or other foreign matter that

would tend to destroy or impair adhesion. Oil and grease shall be removed

with solvent and surfaces shall be wiped dry with clean cloths. When

resealing an existing joint, remove existing calk or sealant prior to

applying new sealant. For surface types not listed below, the sealant

manufacturer shall be contacted for specific recommendations.

3.1.1

Steel Surfaces

Remove loose mill scale by sandblasting or, if sandblasting is impractical

or would damage finish work, scraping and wire brushing. Remove protective

coatings by sandblasting or using a residue-free solvent.

3.1.2

Aluminum or Bronze Surfaces

Remove temporary protective coatings from surfaces that will be in contact

with sealant. When masking tape is used as a protective coating, remove

tape and any residual adhesive just prior to sealant application. For

removing protective coatings and final cleaning, use nonstaining solvents

recommended by the manufacturer of the item(s) containing aluminum or

bronze surfaces.

3.1.3

Concrete and Masonry Surfaces

Where surfaces have been treated with curing compounds, oil, or other such

materials, the materials shall be removed by sandblasting or wire brushing.

Laitance, efflorescence and loose mortar shall be removed from the joint

cavity.

SECTION 07920

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