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Historic Preservation - Technical Procedures

Spectitle:

General Guidelines For The Fabrication And Installation Of Wood Windows

Procedure code:

0861002R

Source:

Federal Building/Uspo, Spokane, Wa - Gsa/Pbs

Division:

Doors And Windows

Section:

Wood Windows

Last Modified:

02/24/2012

Details:

General Guidelines For The Fabrication And Installation Of Wood Windows



GENERAL GUIDELINES FOR THE FABRICATION AND INSTALLATION OF WOOD
WINDOWS


WINDOWS ARE AN IMPORTANT DESIGN ELEMENT CONTRIBUTING TO A
BUILDING S ARCHITECTURAL CHARACTER.  FOR HISTORIC BUILDINGS, STATE
HISTORIC PRESERVATION OFFICERS GENERALLY APPLY THE  SECRETARY OF
INTERIOR S STANDARDS FOR REHABILITATION  WHICH REQUIRE THAT
ORIGINAL MATERIAL BE REPAIRED AND RETAINED WHERE POSSIBLE.
CONDITION SURVEYS ARE TYPICALLY REQUIRED TO DETERMINE IF WINDOWS
ARE TOO DETERIORATED TO SAVE, BEFORE REPLACEMENTS WILL BE
CONSIDERED.  REPLACEMENT WINDOWS SHOULD MATCH THE COLOR, SIZE AND
CONFIGURATION OF THE ORIGINAL WINDOWS AND THE MATERIAL.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes general information relating to
         the fabrication and installation of wood windows and
         includes the following window types:

         1.   Double-Hung Window Units.

         2.   Casement Window Units.

         3.   Decorative Window Units.

         4.   Hopper Window Units.

         5.   Non-Operative (Fixed) Window Units.

         6.   Single-Hung Window Units.

    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).

1.02 REFERENCES
   
    A.   American Society for Testing and Materials (ASTM), 100
          Barr Drive, West Conshohocken, PA 19428, (610) 832-9585
          or FAX (610) 832-9555.

    B.   American National Standards Institute, Inc. (ANSI), 1430
         Broadway, New York, NY  10018.

    C.   Flat Glass Marketing Association (FGMA),

    D.   National Wood Window and Door Association (NWWDA),

1.03 SYSTEM DESCRIPTION

    A.   Performance Grade Classification:  Provide wood windows
         that comply with requirements of NWWDA I.S. 2 for
         performance grade 40.

    B.   Performance Grade Classification:  Provide wood windows
         that comply with requirements of NWWDA I.S. 2 for
         performance grade 60.

    C.   Standards:  Performance requirements for structural
         performance, air infiltration, and water penetration for
         wood windows are those specified in NWWDA I.S. 2
         "Industry Standard for Wood Window Units".

    D.   Testing:  Manufacturer's stock units of each grade of
         required wood window shall have been tested by a
         recognized testing laboratory or agency, in accordance
         with ASTM E330 for structural performance.  Test samples
         shall comply with requirements in NWWDA I.S. 2 for test
         sample sizes and methods.

    E.   Performance Requirements (Grade 60 Windows):  Each
         required window unit shall comply with the following
         performance requirements:

         1.   Air Infiltration:  Not more than 0.10 cfm per sq.
              ft. of overall frame area at an inward test
              pressure of 1.57 lbf per sq. ft.

         2.   Water Penetration:  No water penetration as defined
              in the test method at an inward test pressure of
              6.24 lbf per sq. ft.

         3.   Structural Performance:  No glass breakage, damage
              to hardware, or permanent deformation that would
              impair operation of the unit or residual deflection
              greater than 0.4 percent of the span at a positive
              (inward) and negative (outward) test pressure of 60
              lbf per sq. ft.

    F.   Forced Entry Resistance:  Windows shall comply with
         requirements for Grade 40 level of resistance to forced
         entry when tested in accordance with ASTM F588.

1.04 SUBMITTALS

    A.   Product Data:  Submit product data for each type of wood
         window specified, including standard construction
         details, dimensions of individual components, profiles,
         finishes, hardware, and accessories.

    B.   Shop Drawings:  Submit shop drawings for each type of
         window specified, including 1/4-inch scale wall
         elevations, typical unit elevations at 3/4-inch scale,
         glazing details, and fill-size details of typical
         composite members.

1.05 QUALITY ASSURANCE

    A.   Wood Window Standard:  Comply with provisions of NWWDA
         I.S. 2 for standards of performance and fabrication
         workmanship for wood windows.

    B.   Glazing Standards:  Comply with recommendations of the
         Flat Glass Marketing Association (FGMA) "Glazing Manual"
         and "Sealant Manual" except where more stringent
         requirements are indicated.  Refer to those publications
         for definitions of glass and glazing terms not otherwise
         defined in this section or referenced standards.

    C.   Safety Glass Standard:  Where safety glass is indicated
         or required by authorities having jurisdiction, provide
         the type of products indicated which comply with ANSI
         Z97.1 and testing requirements of 16 CFR Part 1201 for
         category II materials.

    D.   Insulating Glass Certification Program:  Provide
         insulating glass units permanently marked either on
         spacers at least one component pane of units with the
         appropriate certification label of inspecting and testing
         organization indicated below.

         1.   Insulating Glass Certification Council (IGCC)

         2.   Associated Laboratories, Inc.  (ALI)

    E.   Single Source Responsibility:  Provide wood windows
         produced by a single fabricator who is capable of
         indicating prior successful production of units similar
         to those required.

1.06 PROJECT/SITE CONDITIONS

    A.   Field Measurements:  

         1.   Check actual window openings in construction work
              by accurate field measurement before fabrication of
              custom window units.  Show recorded measurements on
              final shop drawings.

         2.   Coordinate fabrication with construction progress
              to avoid delay.  Where necessary, proceed with
              fabrication without measurements, and coordinate
              tolerances to ensure proper fit of window units.

1.07 WARRANTY

    A.   Submit a written warranty signed by the Manufacturer,
         agreeing to repair or replace wood window units that fail
         in materials or workmanship within the specified warranty
         period.

         1.   Failures include, but are not limited to,
              structural failures, including excessive
              deflection, excessive leakage, air infiltration,
              failure of weatherstripping, faulty operation of
              window sash or hardware, and deterioration of
              metals, finishes, and other materials beyond normal
              weathering.

         2.   Warranty period for wood windows is 3 years after
              the date of substantial completion.

         3.   This warranty shall be in addition to and not a
              limitation of other rights the Government may have
              against the Contractor under the Contract
              Documents.


PART 2---PRODUCTS

2.01 MANUFACTURERS

    A.   Pella Corp.
         102 Main Street
         Pella, IA  50219
         515/628-1000

    B.   Andersen Corporation
         100 Fourth Avenue North
         Bayport, MN  55003
         612/439-5150

2.02 MATERIALS

    A.   General:  Comply with requirements of NWWDA I.S. 2.

    B.   Wood:  Clear Ponderosa Pine or other suitable fine-
         grained lumber that has been kiln-dried to a moisture
         content of 6 to 12 percent at time of fabrication and is
         free of visible finger-joints, blue stain, knots, pitch-
         pockets and surface checks larger than 1/8-inch deep by
         2-inches wide.

         1.   Lumber shall be water-repellent preservative
              treated after machining in accordance with NWWDA
              I.S. 4.

    C.   Aluminum Cladding:  Provide manufacturer's standard
         aluminum formed sheet or extruded cladding mechanically
         bonded to exterior wood sash and frame members.

         1.   Trim members:  Aluminum clad wood trim.

         2.   Finish:  Provide factory-applied baked-on enamel
              finish.

              a.   Color:  Custom color as selected by the
                   Architect from the manufacturer's standard
                   color range.

    D.   Anchors, Clips, and Accessories:  Fabricate anchors,
         clips and window accessories of aluminum, non-magnetic
         stainless steel, or hot-dip zinc coated steel complying
         with ASTM A123; provide strength sufficient to withstand
         design pressure indicated.

    E.   Fasteners:  Comply with NWWDA I.S. 2 for fabrication and
         with manufacturer's recommendations and standard industry
         practices for type and size of installation fasteners.

         1.   Use zinc-coated or nonferrous nails and screws for
              window fabrication and installation.

         2.   Use brass screws for hardware and accessory
              installation.

    F.   Hardware:  Provide the manufacturer's standard hardware,
         necessary to properly operate, tightly close, and
         securely lock windows.  Do not use aluminum in frictional
         contact with other metals.

         1.   Provide solid bronze hardware, with plated steel or
              brass/bronze operating bars and rods.

    G.   Compression Weatherstripping:  Provide compressible
         weatherstripping, designed for permanently resilient
         sealing under bumper or wiper action, completely
         concealed when sash is closed.

    H.   Glass and Glazing Materials:  Provide the manufacturer's
         standard clear sealed insulating safety glazing material
         that complies with ANSI Z97.1.

         1.   Insulating glass unit shall have metal spacers,
              sealed between the panes, behind each muntin bar.

    I.   Glazing Seal:  Provide the manufacturer's standard
         extruded vinyl or butyl glazing gasket providing
         weathertight seal.

    J.   Sliding Weatherstripping:  Provide woven pile
         weatherstripping of polypropylene, wool, or nylon pile,
         with resin-impregnated backing fabric, and aluminum
         backing strip; comply with AAMA 701.2.

2.03 EQUIPMENT

    A.   General:  Comply with minimum operating requirements of
         NWWDA I.S. 2.

    B.   Casement Windows:  Provide units containing side-hinged
         swing-out sash, with the following equipment and
         hardware:

         1.   Hook or cam-type latch and lever, for operation
              without screen removal.

              a.   For sash more than 48 inches high, provide 3
                   extension hinges and 2-point latching
                   mechanism.

    C.   Double-Hung Windows:  Provide units containing 2
         balanced, vertically-sliding sash with the following
         equipment and hardware.

         1.   2 pair concealed counterbalancing mechanism.

         2.   Latch at meeting rail.

         3.   Lift handle on the lower rail.

    D.   Hopper Windows:  Provide units containing bottom-hinged
         (hopper) sash with the following equipment and hardware:

         1.   2 balance support arms and pivots with friction
              shoes.

         2.   Cam latch or other latching hardware with lever
              handle or pull.  Provide latch with eye for pole
              operation for operable sash located more than 6
              feet above the floor.

2.04 FABRICATION

    A.   General:  Except to the extent that more stringent
         requirements are indicated, provide the manufacturer's
         standard fabrication of units.  Comply with indicated
         standards.  Include a complete system for assembly of
         components and anchorage of window units.

         1.   Comply with requirements of referenced standards
              for moisture content of lumber at time of
              fabrication and for relative humidity conditions in
              the installation areas.

    B.   Fabricate windows to produce units that are reglazable
         without dismantling sash framing.  Provide openings and
         mortises precut, where possible, to receive hardware and
         other items.

    C.   Each window unit includes sash, frame, stops, sill
         (including undersill or nosing), and moldings, integral
         mullions and muntins, hardware, and accessories.

         1.   Provide weatherstripping at perimeter of each
              operating sash.

              a.   For double/single-hung sash, provide
                   weatherstripping only at horizontal rails of
                   operable sash.

         2.   Provide glazing stops, nailed or snap-on,
              coordinated with glass selection and glazing system
              indicated.

         3.   Preglazed Window Units:  Preglaze window units at
              the shop before delivery.

    D.   Complete fabrication, assembly, finishing, hardware
         application, and other work before shipment to the
         project site, to the maximum extent possible.
         Disassemble components only as necessary for shipment and
         installation.  Where necessary for fitting at site,
         provide ample allowance for scribing, trimming, and
         fitting.

    E.   Wood Finish:  Provide the following finish on exposed
         wood in units:

         1.   Shop-Primed Units:  Provide the fabricator's
              standard shop prime coat on exterior wood surfaces
              only.


PART 3---EXECUTION

3.01 EXAMINATION

    A.   Inspect openings before beginning installation.  Verify
         that the rough or masonry opening is correct and the sill
         plate is level.  Do not proceed with installation of
         window units until unsatisfactory conditions have been
         corrected.

         1.   Masonry surfaces shall be visibly dry, and free of
              excess mortar, sand, and other construction debris.

         2.   Wood frame walls shall be dry, clean, sound and
              well-nailed, free of voids, and without offsets at
              joints.  Ensure that nail heads are driven flush
              with surfaces in the opening and within 3 inches of
              the opening.

3.02 ERECTION, INSTALLATION, APPLICATION

    A.   Comply with manufacturer's instructions and
         recommendations for installation of window units,
         hardware, operators, accessories, and other window
         components.

    B.   Set units plumb, level, true to line, without warp or
         rack of frames or sash.  Provide proper support and
         anchor securely in place.

    C.   Set sill members in a bed of compound or with joint
         fillers or gaskets as indicated, to provide weathertight
         construction.  Coordinate window installation with wall
         flashings and other built-in components.

3.03 ADJUSTING/CLEANING

    A.   Adjust operating sash and hardware to provide a tight fit
         at contact points and weatherstripping, and to provide
         smooth operation and a weathertight closure.  Lubricate
         hardware and moving parts.

    B.   Clean interior and exterior surfaces promptly after
         installation of windows.  Take care to avoid damage to
         protective coatings and finishes.  Remove excess glazing
         and sealants, dirt, and other substances.

    C.   Clean glass of preglazed window units promptly after
         installation.  Wash and polish glass on both faces not
         more than 4 days prior to date scheduled for final
         inspection.  Comply with manufacturer's recommendations
         for final cleaning and maintenance.

    D.   Remove and replace glass that is broken, chipped,
         cracked, abraded or damaged in other ways during
         construction period, including natural causes, accidents,
         and vandalism.

3.04 PROTECTION

    A.   Institute and maintain protection and other precautions
         required through remainder of construction period to
         ensure that, except for normal weathering, window units
         will be without damage or deterioration at the time of
         substantial completion.

                             END OF SECTION