Skip to main content

Historic Preservation - Technical Procedures

Spectitle:

Gilding Aluminum Features

Procedure code:

0501015R

Source:

Hsr - Icc Building/Wash, Dc - Grier Brown Renfrow Architects

Division:

Metals

Section:

Metal Materials

Last Modified:

02/24/2012

Details:

Gilding Aluminum Features



GILDING ALUMINUM FEATURES


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on applying gold leaf to
         exterior aluminum surfaces.

    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 Precaution= s

         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).

1.02 QUALITY ASSURANCE

    A.   Regulatory Requirements:  Comply with municip= al and
         Federal regulations concerning the use of airblasting
         equipment and protection of individuals against airborne
         material.=0CPART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Sepp Leaf Products, Inc.
         381 Park Avenue South, Ste. 1312
         New York, NY  10016
         212/683-2840

2.02 MATERIALS

    A.   Walnut shells (mesh size 60/200)

    B.   0000 stainless steel wool

    C.   Slow oil size with chromium oxide

    D.   Gold leaf for gilding (carat to be determined) (Sepp Leaf
         Products, Inc.), or approved equal.

    E.   Absorbent cotton

2.03 EQUIPMENT

    A.   Gilder's tip

    B.   Agate

    C.   Flint or hematite burnisher


PART 3---EXECUTION

3.01 PREPARATION

    A.   Clean aluminum surfaces of soil, old gold leaf, sizing,
         paint and oxidation by airblasting with walnut shells
         (mesh size 60/200).  TAKE CARE NOT TO ERODE, PIT OR GOUGE
         THE ALUMINUM SURFACE.

         1.   Minimum nozzle diameter to be 3/8".

         2.   Air pressure to be 20 lbs. per square inch at gauge
              (this may be increased to 25 lbs. as required).

         3.   Maintain angle of blasting at 90 degrees.

    B.   Rub aluminum surfaces with 0000 stainless steel wool to
         obtain a smooth, uniform surface.

3.02 ERECTION INSTALLATION, APPLICATION

    A.   Remove any dust and dirt from aluminum surface.

    B.   Apply size to areas to be gilded.

    C.   Allow the size to become tacky before applying the gold
         leaf.  Size that is too wet will destroy the burnish,
         while size that is too dry will prevent the leaf from
         adhering well.  Protect size from dust as it dries.

    D.   When the size becomes tacky, lay the gold leaf.  Take
         care to cover all the sized surfaces.  Patch any cracks
         or exposed areas that occur in the leaf.=

    E.   Evenly tamp down the leaf with cotton.

    F.   Lightly rub the leaf with absorbent cotton to remove any
         laps or wrinkles.  Gently wipe the surface to remove
         excess gold leaf.

    G.   Allow the size to dry at least 24 hours.

    H.   Using a burnisher, gently rub the gilded surface in
         circular motions and then using hard, firm strokes.

                         END OF SECTION