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Historic Preservation - Technical Procedures

Spectitle:

Cleaning And Painting Steel Windows

Procedure code:

0850002R

Source:

National Capitol Region Specifications

Division:

Doors And Windows

Section:

Metal Windows

Last Modified:

02/24/2012

Details:

Cleaning And Painting Steel Windows



CLEANING AND PAINTING STEEL WINDOWS


BEFORE UNDERTAKING ANY PROJECT INVOLVING PAINT REMOVAL, APPLICABLE
STATE AND FEDERAL LAWS ON LEAD PAINT ABATEMENT AND DISPOSAL MUST
BE TAKEN INTO ACCOUNT AND CAREFULLY FOLLOWED.  STATE AND FEDERAL
REQUIREMENTS MAY AFFECT OPTIONS AVAILABLE TO OWNERS ON BOTH PAINT
REMOVAL AND REPAINTING.  THESE LAWS, AS WELL AS ANY REQUIREMENTS
PROHIBITING VOLATILE ORGANIC COMPOUNDS (VOCs), SHOULD BE REQUESTED
FROM THE STATE HISTORIC PRESERVATION OFFICER IN EACH STATE.  (From
Preservation Brief 28, "Painting Historic Interiors").  REGULATORY INFORMATION MAY
ALSO BE REQUESTED FROM THE ENVIRONMENTAL PROTECTION AGENCY (EPA)
REGIONAL OFFICE AND/OR THE STATE OFFICE OF ENVIRONMENTAL QUALITY.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on the cleaning and
         painting of exterior steel windows.  It also includes
         information on removing all deteriorated caulking and
         recaulking all joints between metal elements and masonry.

    B.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure.  These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precautions

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         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).


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Devcon Corporation
         30 Endicott Street
         Danvers, MA  01923
         800/933-8266

2.02 MATERIALS

    A.   Metal Filler: Steel filled two-part epoxy metal filler,
         putty grade such as "Devcon Plastic Steel A" (Devcon
         Corporation), or approved equal.

    B.   Dry Grit Blasting: Fine grit No. 16 at 80-100 psi.

    C.   Paint for Metal: Paint products shall be fresh and well
         ground; shall not settle readily, cake or thicken in the
         container; shall be broken up readily with a paddle to a
         smooth consistency and shall have easy application
         properties. Other painting materials such as linseed oil,
         turpentine, mineral spirits, and miscellaneous
         thickeners, shall be the highest quality of an approved
         manufacturer.

         1.   Colors: Each primer coat to be clearly different in
              color; base coat to be clearly different from
              primer and finish coat; finish coat to match
              existing or as approved by RHPO.

         2.   Dry Film Thickness:  Primer, base and finish, each
              2 mils.

    D.   Sealant Backer Rod: Polyethylene compressible rod 50%
         larger in diameter than joint.

    E.   Sealant: Polysulfide sealant, white or light grey in
         color.

    F.   Mineral Spirits:

         1.   A petroleum distillate that is used especially as a
              paint or varnish thinner.

         2.   Other chemical or common names include Benzine* (not
              Benzene); Naphtha*; Petroleum spirits*; Solvent
              naphtha*.

         3.   Potential Hazards:  TOXIC AND FLAMMABLE.

         4.   Safety Precautions:

              a.   AVOID REPEATED OR PROLONGED SKIN CONTACT.

              b.   ALWAYS wear rubber gloves when handling
                   mineral spirits.

              c.   If any chemical is splashed onto the skin,
                   wash immediately with soap and water.

         5.   Available from construction specialties
              distributor, hardware store, paint store, or
              printer's supply distributor.

2.03 EQUIPMENT

    A.   Chisels

    B.   Joint tools

    C.   Putty knife

    D.   Stiff, bristle brushes

    E.   Paint brushes


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Enclose any dry grit blasting work areas with
              temporary scaffolding or framework sufficient to
              support tarpaulin enclosure to prevent escape of
              abrasive.

         2.   Shield adjacent masonry and glass with a temporary
              covering of cardboard or fiberboard held in place
              with heavy-duty strapping tape or wood bracing.

    B.   Surface Preparation:

         1.   Determine surfaces to which paint is to be applied
              are even, smooth, sound, clean, dry and free from
              defects affecting proper application. Report
              defective surfaces to Contracting Officer.

         2.   All painting should be executed at a temperature
              range of 50  to 80 F, at a relative humidity below
              60%.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Remove all paint to bare metal from the surface of the
         frames and sash. Restore sash to full operation.

    B.   Paint removal may be done by dry grit blasting, scraping
         or sanding.  See also 05010-05-R for additional guidance
         on paint removal from steel.

    C.   Remove, by hand, all caulking between metal and masonry.

    D.   Clean off dirt and grease by rubbing the surface with
         mineral spirits. Remove residual grit from all surfaces
         by air blasting.

    E.   Seal all open joints between metal elements and masonry
         with backer rods and sealant. Joints shall be concave
         with smooth finish. Do not allow sealant to extend over
         the edges of the metal or the face of the stone.  See
         also 07900-01-R for guidance on replacing joint sealants
         between window frames and masonry.

    F.   Prime all metal within two hours of cleaning.  Use color
         distinct from finish color.

    G.   Paint to match color specified by the RHPO.

         1.   Brush-apply material evenly without runs, sags, or
              other defects. Work each coat onto the material
              being coated at an average rate of coverage
              recommended in manufacturer's printed instructions.

         2.   Cover surfaces completely to provide uniform color
              and appearance with a minimum of dry, film
              thickness of 2 mils.

         3.   Make edges of paint, adjoining other materials or
              colors, sharp and clean and without overlaps.

         4.   Apply additional coats when undercoats, stains, or
              other conditions show through final coat of paint,
              until paint film is of uniform finish, color and
              appearance.  Insure that corners, edges, crevices
              and exposed fasteners receive a dry film thickness
              equal to that of flat surfaces.

         5.   Each coat of paint is to be slightly darker than
              the preceding coat with the final coat exactly
              matching the accepted samples.

3.03 ADJUSTING/CLEANING

    A.   Cleanup: Remove all paint where it has spilled or
         spattered.  Use paint thinner or solvent as necessary to
         effect complete removal.

                         END OF SECTION