Specification:Removing old resilient flooring adhesives from concrete

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=GENERAL=

SUMMARY
 This procedure includes guidance on stripping concrete floors to remove old resilient flooring adhesives. Safety Precautions:  DO NOT store any chemicals in unmarked containers. EXCELLENT VENTILATION MUST BE PROVIDED AS MOST STRIPPERS HAVE A SOLVENT ODOR. USE RESPIRATORS WITH SOLVENT FILTERS. Provide adequate clothing and protective gear where the chemicals are shown to be dangerous. Have available antidote and accident treatment chemicals where noted.   See Specification:General project guidelines for general project guidelines to be reviewed along with this procedure. These guidelines cover the following sections:  Safety Precautions</li> Historic Structures Precautions</li> Submittals</li> Quality Assurance</li> Delivery, Storage and Handling</li> Project/Site Conditions</li> Sequencing and Scheduling</li> General Protection (Surface and Surrounding)</li> </ol> </li> </ol> These guidelines should be reviewed before performing this procedure and should be followed, when applicable, along with recommendations from the State Historic Preservation Officer (SHPO) or designated representative.

=PRODUCTS=

MANUFACTURERS
<ol type="A"> ProSoCo, Inc. 755 Minnesota Avenue P.O. Box 1578 Kansas City, KS  66117 800/255-4255 or 913/281-2700</li> </ol>

MATERIALS
<ol type="A"> Commercial stripper such as "Sure Klean 509 Paint Stripper(ProSoCo, Inc.)", or approved equal.  Effective in removing high-strength clear coatings from masonry; also effective in removing asphalt, tar and grease stains.</li> Fast-acting; surface neutralization NOT required.</li> Suitable for use on vertical surfaces.</li> -OR-

"Standoff Non-Meth Stripper" (ProSoCo, Inc.), or approved equal.

DOES NOT contain methanol or methylene chloride.</li> <li>Suitable for interior and exterior use on masonry, wood and metal surfaces.</li> <li>Suitable for use on vertical surfaces.</li> <li>Rinses easily with water; surface neutralization NOT required.</li> </ol> </li> <li>Cleaner for use after adhesive removal or for prepping the surface for a new coating or flooring material such as "Sure Klean Degreaser and Etch" (ProSoCo, Inc.), or approved equal</li> </ol>

EQUIPMENT
<ol type="A"> <li>Solvent-resistant brush or roller</li> <li>Pressure water rinsing equipment (Follow stripper manufacturer's recommendations for equipment fittings and pressure ratings)</li> <li>Metal scraper</li> <li>Stiff bristle brush</li> </ol> =EXECUTION=

PREPARATION
<ol type="A"> <li>Surface Preparation: <ol> <li>If high pressure water is used, learn floor drainage characteristics and procedures for handling water and runoff.</li> <li>The surface must be dry before applying any paint strippers for removing adhesives.</li> </ol> </li> </ol>

ERECTION, INSTALLATION, APPLICATION
<ol type="A"> <li>Apply a uniform coat of stripper (approximately 1/8" thick) to the old adhesive material working in small areas at time (approximately eighty square feet).</li>   <li>Allow stripper to dwell until adhesive is lifted from the surface or dissolved.  Scrub the surface periodically with a stiff bristle brush.  Reapply if stripper is absorbed into the concrete.</li>    <li>Scrape adhesive buildup and residue from the surface using metal scrapers and wire or stiff bristled brushes.</li> -OR-

Thoroughly rinse the surface with high pressure water, following manufacturer's instructions. Be sure to contain water runoff and keep surrounding areas to be cleaned as dry as possible.

<li>Reapply stripper as necessary following above procedures to completely remove adhesive; shorter dwell times are probably sufficient.</li> <li>When all of the adhesives have been removed, rinse the surface thoroughly with hot or cold water to neutralize the surface and remove all traces of stripper.</li> <li>If the floor still looks dirty or needs a surface coating, apply a chemical cleaner such as "Sure Klean Degreaser and Etch" or approved equal. <ol> <li>Dilute with 2 to 6 parts water depending on severity of staining and degree of etching desired.</li> <li>Apply liberally to the concrete surface and allow to dwell for 3 to 5 minutes.</li> <li>Thoroughly rinse the surface with clean, clear water and allow to dry. Rinsing may be supplemented with the use of a stiff bristle brush.</li> </ol> </li> </ol>