R -SECTION_08551 Final version 10.19.09.docx

AG-63PX-S-09-0008 Rhinelander Window Replacement Page 1 of 8

SECTION 08551

ALUMINUM-CLAD WOOD CASEMENT WINDOWS

GENERAL

SUMMARY

Section includes factory fabricated aluminum clad wood casement windows, fixed transom, operating sash, factory glazed, operating hardware and insect screens to be installed in an existing window cavity.

Related Sections:

Section 06114 - Wood Blocking and Curbing: Wood perimeter shims.

Section 07900 - Joint Sealers: Perimeter sealant and back-up materials.

REFERENCES

AAMA/NWWDA 101/I.S.2 (American Architectural Manufacturers Association)(National Wood Window and Door Association) - Aluminum, Vinyl (PVC) and Wood Windows and Glass Doors.

AAMA 1503.1 (American Architectural Manufacturers Association) - Test Method for Thermal Transmittance and Condensation Resistance of Windows, Doors, and Glazed Wall Sections.

ASCE 7 (American Society of Civil Engineers) - Calculation of Wind Loads.

ASTM E283 - Test Method for Rate of Air Leakage Through Exterior Windows, Curtain Walls, and Doors.

ASTM E330 - Test Method for Structural Performance of Exterior Windows, Curtain Walls, and Doors by Uniform Static Air Pressure Difference.

ASTM E547 - Test Method for Water Penetration of Exterior Windows, Curtain Walls, and Doors by Cyclic Static Air Differential.

ASTM F588 - Resistance of Window Assemblies to Forced Entry Excluding Glazing.

GANA (Glass Association of North American, formerly FGMA) - Glazing Manual.

NFRC (National Fenestration Rating Council) 100 - Procedure for Determining Fenestration Product Thermal Properties.

SIGMA (Sealed Insulated Glass Manufacturers Association) - Sealed Insulating Glass: Glass to Elastomer Edge, Glass to Mastic Edge, Special Glasses.

SYSTEM DESCRIPTION

Wood Windows: Wood aluminum clad sections, factory fabricated, vision glass, related flashings, anchorage attachment devices, natural wood finish for exposed interior window.

Window Units: Units are venting and fixed casement.

PERFORMANCE REQUIREMENTS

Primary Performance Requirements: AAMA/NWWDA 101/I.S.2 Specification C-R45.

System Design: Design and size components to withstand dead loads and live loads caused by positive and negative wind loads acting normal to plane of wall as calculated in accordance with ASTM E 330 to design pressure of 60 lb/sq ft.

Member Deflection: Limit member deflection to flexure limit of glass 1/175with full recovery of glazing materials.

Thermal Movement: Design sections to permit thermal expansion and contraction of components to match perimeter opening construction.

Air Infiltration: Window air leakage through assembly to 0.05 cfm /sq ft of frame, measured at reference differential pressure across assembly of 1.57 psf (25 mph) as measured in accordance with ASTM E283.

F. Thermal Performance: Must meet NFRC ENERGY STAR rating.

Water Leakage: None, when measured in accordance with ASTM E547 under a static pressure of 6.75 psf after 3 cycles of 5 minutes each, with water applied at a rate of 5 gallons per hour per square foot.

Forced Entry Resistance: ASTM F588 Grade 10 or greater (ground level windows) for assembly types indicated.

SUBMITTALS

Shop Drawings: Indicate opening dimensions, framed opening tolerances, affected related work, and installation requirements.

Product Data: Submit component dimensions, anchorage and fasteners, glass, internal drainage details and for window hardware and accessories.

Manufacturer's Certificate: Certify products meet or exceed specified requirements Manufacturer's Installation Instructions: Submit special procedures and perimeter conditions requiring special attention.

QUALITY ASSURANCE

A. Perform Work in accordance with the following:

1. Windows: Must meet minimum requirements of NWWDA I.S. - Industry Standard for Wood Windows.

2. Insulated Glass: Fabricate insulated glass units in accordance with IGMA Glazing Manual.

2. Mockup

a. Provide sample installation at a window unit specified for replacement.

b. Mock-up will represent minimum quality required for work.

c. Mock-up, if accepted by the government, may remain in place within the Work.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing commercial wood windows with minimum three years of documented experience.

Installer: Company specializing in performing commercial installation of wood windows with minimum five years experience.

DELIVERY, STORAGE, AND HANDLING

Protect factory finished surfaces with wrapping. Do not use adhesive papers or sprayed coatings that bond when exposed to sunlight or weather.

Store off ground, under cover, protected from weather and construction activities.

ENVIRONMENTAL REQUIREMENTS

Do not install sealants when ambient temperature is less than 40 degrees F (5 degrees C).

Maintain this minimum temperature during and after installation of sealants.

WARRANTY

Furnish twenty-year manufacturer warranty for insulated glass units from seal failure, interpane dusting or misting, and replacement of same. Furnish a ten-year manufacturers warranty on all other window components. Warranty must include a minimum of 2 year labor coverage for replacement of defective materials.

PRODUCTS

WOOD WINDOWS

Manufacturers:

Pella Corp. Model Designer Series Fixed and Casement Windows or equivalent.

Substitutions: Provide complete manufacturer catalog sheet information covering product performance, component specifications, options provided, warranty, and other salient characteristics that will satisfy review to determine equivalence.

Product Description: Commercial quality wood windows, aluminum clad exterior finish, natural wood interior finish, fixed casement and operable side casements, glass and glazing, operating hardware, weather-stripping, blinds, muntin bars, and insect screens.

Window Size: Contractor shall field verify window sizes shown on the schedule and order each window which will accommodate the window cavity, and also allow thermal movement of window unit.

COMPONENTS

Frame: Select softwood, water repellant, preservative-treated in accordance with NWWDA I.S 4. Interior exposed surfaces clear pine ready for transparent interior finish.

Exterior Frame /Aluminum Cladding Exterior Surface: Formed aluminum factory fit to profile or exterior exposed surface; factory finished fluorocarbon based multi-stage finish system (Kynar 500).

Sash Construction: Select softwood, water repellant, preservative treated in accordance with NWWDA I.S.4. Interior exposed surfaces clear pine. Exterior surfaces clad with aluminum, lap-jointed and sealed. Corners mortised and tenoned, glued and secured with metal fasteners. Sash thickness: 3 -11/16”.

Insulating Glass: Sealed triple pane units; conform with ASTM C1036.

Glazing: Gray tinted, multi –layered Low E tempered float glass.

Pane Thickness: Minimum 1/8 thick Minimum Total Unit Thickness: 5/8 inch.

Internal tilt-only operable blinds, with crank-hand operator mounted on inside face of window frame.

Sills and Jambs: Where replacement sills and jambs are necessary, preservative-treated wood covered with break-formed aluminum similar to window clad cover. Where sills and jambs are re-used, cover with break-formed aluminum similar to window clad. Clad cover one piece full height and width of opening. Exterior metal trim and sills to be provided by the window supplier.

Stools: Protect and re-use the existing stools, where possible.

Window Hardware:

Sash lock: A single handle locking system operating positive-acting arms that reach out and pull sash into locked position: two unison-operated locks installed on frame height greater than 29 inches.

Operator: Worm-gear sash operator with hardened gears. Operator base to be zinc die-cast with painted finish. Operator linkage, hinge slide, and hinge arms to be 300 series stainless steel. Exposed fasteners to be stainless steel. .

Insect Screen Frame: Aluminum frame of rectangular sections; fit with adjustable hardware; nominal size similar to operable glazed unit.

Insect Screens: Black vinyl-coated 18/16 mesh fiberglass screen cloth complying with FS L-S 125B and ANSI-SMA-1004, set in an aluminum frame fitted to the inside of window. Screen frame shall be baked enamel.

Operable Sash Weather-stripping - Dual: Resilient PVC material in a dual durometer design with welded corners, compressed between the frame and sash for positive seal on all four sides. Secondary PVC leaf-type weather stripping between edge of sash and frame.

ACCESSORIES

A. Anchors: Hot-dipped galvanized.

MISCELLANEOUS WOOD REPLACMENT TRIM

Replace in-kind as shown on original construction drawings and as per field verification. Finish to match existing. Trim to be provided by the general contractor/installer.

FABRICATION

Ensure joints and connections are flush, hairline, and weather-tight. Some opening widths exceed the length of available exterior metal sills –there will be seams to be sealed.

Finger joints not permitted in units intended for transparent finish.

Form sills in one piece wherever possible. Slope sills for wash.

Furnish weather stop flange for perimeter of unit.

Fabricate components with minimum clearances and shim spacing around perimeter of assembly, yet allowing installation and dynamic movement of perimeter seal.

Arrange fasteners to be concealed from view.

Assemble insect screen frame, miter and reinforced frame corners. Fit mesh taut into frame and secure. Fit frame with four spring loaded steel pin retainers.

Double weather-strip operable units.

Factory install glass in window units in accordance with manufacturer’s standard method conforming with GANA Glazing Manual and to achieve performance criteria specified.

SHOP FINISHING

Exterior Surfaces: Aluminum-clad, Tan color as shown on Pella Manufacturers color pallet, or approved equal. Top coat with baked-on Kynar 500 thermoplastic enamel. Finish to meet the standards of Pella Brand EnduraClad Plus Exterior finish or equivalent.

Screens and Frame: Screens and frames should be a Pella (standard hardware color) or equivalent to be approved by government representative prior to supply & install.

Exposed Hardware: Baked enamel, Pella brand (standard hardware color) color or equivalent to be approved by government representative prior to supply & install.

FIELD FINISHING

Interior Window Surfaces: Note – some offices and lab areas are to be stained and sealed. Other labs and offices will be prime -painted and top coated.

1. Wood, field finished with transparent materials. Low VOC stain followed with two-coat water based polyurethane finish. Stain color to be selected by Government.

2. Wood, field finished with latex based paints. Apply one coat of low VOC rated latex interior primer, apply two finish coats of latex based low VOC interior paint following manufacturers guidelines.

Paint color and finish schedules will be made available from government representative to match existing wall colors and finishes.

Miscellaneous Replacement Wood Trim: Field finish in kind to match the existing finish.

EXECUTION

EXAMINATION

Verify wall openings and adjoining air and vapor seal materials are ready to receive work of this section. Verify opening dimensions and clearances are as indicated on shop drawings.

INSTALLATION

The contractor shall rework the window rough opening as necessary to accommodate the new window in accordance with the manufacturer’s recommendations, and/or specified herein.

Attach window frame and shims to perimeter opening to accommodate construction tolerances and other irregularities.

Align window plumb and level, free of warp or twist. Maintain dimensional tolerances and alignment with adjacent work.

Install sills, and jamb fillers at necessary for the installation.

Provide thermal isolation where components penetrate or disrupt building insulation. Use low-expansive window and door foam insulation.

Lintel Deflection: Accommodate possible prior deflection of lintel without damage to components, deterioration of seals, or movement between window and perimeter framing.

Air and Vapor Seal: Maintain continuous air barrier and vapor retarder throughout assembly, primarily in line with inside pane of glass and heel bead of glazing compound.

Coordinate the installation of break-formed aluminum clad finish on existing or new exposed wood window framing materials (window divider, sills/jamb extensions).

Coordinate attachment and seal of perimeter air and vapor barrier materials.

Install operating hardware.

ERECTION TOLERANCES

Maximum Variation from Level and from Plumb: 1/16 inch every 3 ft non-cumulative or 1/8 inch per 10 ft, whichever is less.

ADJUSTING

Adjust hardware for smooth operation and secure weather tight closure.

CLEANING

Remove protective material from factory-finished surfaces.

Remove labels and visible markings.

Wash surfaces by method recommended and acceptable to sealant and window manufacturer; rinse and wipe surfaces clean.

SCHEDULES

The Contractor shall reference the Drawing for details and other information regarding the original window installation. All wall and window cavity dimensions shall be field verified by the Contractor prior to ordering the window units.

END OF SECTION