Specification:Removal of adhesive residue from brick, granite and limestone

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REMOVAL OF ADHESIVE RESIDUE FROM BRICK, GRANITE AND LIMESTONE

THE CLEANING OR REMOVAL OF STAINS FROM STONE MAY INVOLVE THE USE OF LIQUIDS, DETERGENTS OR SOLVENTS WHICH MAY RUN OFF ON ADJACENT MATERIAL, DISCOLOR THE STONE OR DRIVE THE STAINS DEEPER INTO POROUS STONES. USE THE PRODUCTS AND TECHNIQUES DESCRIBED HERE ONLY FOR THE COMBINATIONS OF DIRT/STAIN AND STONE SPECIFIED. =GENERAL=

SUMMARY
 This procedure includes guidance on removing adhesive residue remaining on brick, granite and limestone surfaces after removing signage or other objects which have been applied directly to the marble surface. Surface-mounted signage is a common problem in GSA buildings, both on the exterior and in public lobbies. The signage is often applied directly to the stone surface with an adhesive. This solution for needed signage is unsightly, and reversal is often difficult, leaving the surface discolored and stained. Free- standing signage is usually the preferred solution, when possible. For guidance on other types of stain removal from granite, see 04465-01-R, 04465-02-R, 04465-03-R, 04465- 04-R, 04465-05-R, 04465-06-R, 04465-08-R, 04465-14-R, 04465-16-R, 04465-19-R, 04465-20-R, 04465-25-R, and 04465-26-R. See 01100-07-S for general project guidelines to be reviewed along with this procedure. These guidelines cover the following sections:  Safety Precautions Historic Structures Precautions Submittals Quality Assurance</li> Delivery, Storage and Handling</li> Project/Site Conditions</li> Sequencing and Scheduling</li> General Protection (Surface and Surrounding)</li> </ol> </li> These guidelines should be reviewed prior to performing this procedure and should be followed, when applicable, along with recommendations from the Regional Historic Preservation Officer (RHPO). For additional information on poulticing, see 04455-02-R.</li> </ol> =PRODUCTS=

MANUFACTURERS
<ol type="A"> Diedrich Chemicals Restoration Technologies, Inc. 300A East Oak Street Oak Creek, WI 53154 414/764-0058 or 800/323-3565</li> 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"> Adhesive Residue Remover: Commercially available emulsified, non-corrosive, non-caustic liquid solvent cleaner specifically formulated for removal of asphalt, grease, oil and similar stains from brick, stone and other masonry surfaces, such as "Sure Klean Asphalt and Tar Remover" (ProSoCo, Inc.), or approved equal.</li> Liquid Strippable Masking Agent: Manufacturer's standard liquid, film forming, strippable masking material for protecting glass, metal and polished stone surfaces from damaging effect of acidic and alkaline masonry cleaners, such as "Sure Klean Acid Stop" (ProSoCo, Inc.), "Diedrich Acid Guard" (Diedrich Chemicals), or approved equal.</li> Water: Potable, non-staining and free of oils, acids, alkalis and organic matter.</li> </ol>

EQUIPMENT
<ol type="A"> Brushes: Natural fiber bristle only. The use of wire brushes or steel wool is not permitted.</li> Wood spatula</li> </ol> =EXECUTION=

EXAMINATION
<ol type="A"> Verification of Conditions: Examine the marble surface CAREFULLY to determine the cause of staining before proceeding with any cleaning operation.</li> </ol>

PREPARATION
<ol type="A"> Protection: Protect adjacent masonry using liquid strippable masking agent.</li> </ol>

ERECTION, INSTALLATION, APPLICATION
<ol type="A"> General: <ol> Remove adhesives, soiling, stains and crusts from the masonry without damaging underlying material and to give all stone a clean, uniform appearance without blotches, streaks or other irregularities. Use the gentlest means to meet the cleaning objective.</li> <li>If the exterior masonry has been previously subjected to inappropriately harsh and uneven cleaning, it is expected that the cleaning will reveal the original colors and textures of the brick, but that it will not completely correct the differential effects of the previous cleaning. Clean masonry to remove adhesives, soiling, stains and crusts to the extent feasible without further damaging it.</li> </ol> </li> <li>Remove large accumulations by mechanical scraping with a wood spatula taking care to avoid damage to masonry.</li> <li>Brush apply solvent-based water rinse-able cleaner with a fine bristle brush to area damaged by tape residue. Allow to dwell for three to five minutes. Agitate with a stiff fiber bristle brush as necessary.</li> <li>Thoroughly rinse with low pressure water (400 psi).</li> <li>Repeat application to remove persistent stains and deeply embedded residues.</li> <li>For guidance in removing adhesive residue by poulticing with a solvent, see 04455-23-R.</li> </ol>