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Historic Preservation - Technical Procedures

Spectitle:

Installing Suspended Ceiling Systems

Procedure code:

0951301R

Source:

Us Custom House/Po, St. Louis, Mo - Gsa/Pbs, Kansas City, Mo

Division:

Finishes

Section:

Metal Acoustical Ceilings

Last Modified:

02/24/2012

Details:

Installing Suspended Ceiling Systems



INSTALLING SUSPENDED CEILING SYSTEMS


THOUGH THE INSTALLATION OF SUSPENDED CEILINGS IN HISTORIC BUILDINGS
IS NOT IN GENERAL CONFORMANCE WITH THE SECRETARY OF THE INTERIOR'S
GUIDELINES, IT IS A COMMON PRACTICE IN MANY GSA BUILDINGS.  THIS
TYPE OF WORK SHOULD ONLY BE PERFORMED IN A MANNER WHICH IS FULLY
REVERSIBLE AND CAUSES MINIMAL DAMAGE TO THE EXISTING HISTORIC
FABRIC.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on installing a
         suspended ceiling system to support various types of
         ceiling panels.

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

         1.   Historic Structures Precautions

         2.   Submittals

         3.   Quality Assurance

         4.   Delivery, Storage and Handling

         5.   Project/Site Conditions

         6.   Sequencing and Scheduling

         7.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed along with
         recommendations from the Regional Historic Preservation
         Officer (RHPO).

1.02 SUBMITTALS

    A.   Product Data:  For information only, submit two copies of
         manufacturer's product specifications and installation
         instructions for panels and for suspension system,
         including certified laboratory test reports and other
         data as required to show compliance with the
         specifications.  Distribute one additional copy of each
         installation instruction to installer.  Submit 2 copies
         of manufacturer's instructions for cleaning  ceiling
         including precautions against materials and methods which
         may be detrimental to finish.

    B.   Shop Drawings:  Submit shop drawings indicating
         appropriate methods for attaching to historic materials
         and finishes.

    C.   Samples:  Submit 3 sets of 12" square samples.  In each
         set of samples show the full range of exposed color and
         texture to be expected in the completed work.

    D.   Design Data/Test Reports/Certificates: Submit certificate
         from manufacturer that material and finish meet specified
         requirements.

1.03 PROJECT/SITE CONDITIONS

    A.   Space Enclosure:  Do not install ceiling until space has
         been enclosed and is weather-tight and until work above
         the ceiling has been completed and until satisfactory
         conditions of temperature and humidity will be
         continuously maintained.


PART 2---PRODUCTS

2.01 MATERIALS

    A.   Ceiling Panels: Type, size and color as directed and
         approved by RHPO.  Provide panels with formed edges
         appropriate for specified mounting method and meeting all
         specified requirements.

    B.   Suspension System:

         1.   Comply with ASTM C635, Heavy Duty unless more
              stringent requirements are specified herein.

         2.   General:  Provide heavy duty grid, direct hung,
              intermediate duty system consisting of 1-1/2" x
              3/4" channels @ 4'-0" o.c. each way, hung from or
              attached to structure, cross tees, and other
              components necessary for a complete installation
              including (as applicable for conditions) inserts,
              anchors, hangers, edge moldings, trim, clips,
              springs and other required accessories or as shown
              on the drawings.

         3.   Where ceiling panels abutt walls, beams or other
              surfaces or as detailed, provide finish channel
              wall molding in not less than 16 gauge (.05") -
              finished as specified for panels.

         4.   At light fixtures, diffusers or other interruptions
              of the ceiling where panel edges might otherwise be
              exposed, provide edge trim as required for neat
              finished appearance.

         5.   Detail suspended ceiling to preserve exterior
              appearance of window.  Keep dropped ceiling a
              minimum of 3 feet back from window.  Do not allow
              suspended ceiling geight to encroach move than 12"
              on top of window height.


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Verification of Conditions:  Examine each space and
         verify that existing historic features and equipment
         installed above the ceiling will not conflict with
         ceiling installation of access.  Notify the Contractor in
         writing of any unsatisfactory conditions.  Do not proceed
         with the work until conditions have been corrected.
         Commencement of ceiling installation shall indicate
         acceptance of condition of area.

3.02 PREPARATION

    A.   Planning:  Unless otherwise shown, plan each layout to
         balance border widths at opposite edges of each ceiling
         area.  Avoid use of ceiling plans wherever possible.
         Consult the RHPO for resolution of conflicts or where
         deviation from the reflected ceiling plans is necessary.

         1.   Plan installation of ceiling supports to minimize
              damage to historic materials.  Include protection
              of character defining elements.

    B.   Hanger Supports and Inserts:  Where cast-in-place
         concrete is indicated to support  ceiling, furnish
         required inserts at the commencement of formwork.  As
         placement of concrete or metal deck (as applicable)
         progresses, verify that hanger supports are properly
         located and secured.

         1.   Protect historic finishes and elements when
              installing suspension system.  If alterations of
              historic materials and finishes are required, work
              shall be reversible and cause minimal damage.
              Character defining or ornamental elements shall not
              be altered.

3.03 ERECTION, INSTALLATION, APPLICATION

    NOTE:  Install materials in accordance with manufacturer's
    printed instructions, and to comply with governing
    regulations, fire resistance rating requirements as indicated
    and industry standards applicable to the work.

    A.   Install suspension system in accordance with applicable
         provisions of ASTM C636 except to the extent that more
         stringent requirements are indicated or required for
         compliance with governing regulations or fire resistance
         ratings.  Suspend ceiling hangers from building
         structural members only.  As the work progresses verify
         compliance with all tolerances specified in ASTM C636.

         NOTE:  PLAN INSTALLATION OF CEILING SUPPORTS SO AS TO
         MINIMIZE DAMAGE TO HISTORIC MATERIALS AND FINISHES.

    B.   Installing Ceiling Panels:  

         1.   Install panels, in coordination with suspension
              system, with edges concealed by flanges of
              supporting members.

         2.   Install hold-down clips as recommended by panel
              manufacturer as indicated or required.

         3.   Install moldings and trim as specified as work
              progresses.  Miter corners accurately to provide
              hairline joints.

         4.   Scribe and cut panels for accurate fit at borders
              and at interruptions and penetrations by other work
              through the ceilings.

3.04 ADJUSTING/CLEANING

    A.   Following completion of work, verify that panels are
         properly seated with no cracks between panels and
         suspension flanges.  Replace scratched or bent panels.
         Clean dirty panels in accordance with manufacturer's
         instructions.  

    B.   After 30 days, inspect the installation and clean, adjust
         or replace any missing or defective work.

                        END OF SECTION