Last saved by: Michael Marshall

+++ EDITOR NOTE: Items in red to be addressed on a per project basis +++

SECTION 08 4413

GLAZED ALUMINUM CURTAIN WALLS
PART 1  GENERAL
1.01	SECTION INCLUDES
A.	Aluminum-framed curtain wall, self-supporting, with vision glazing.
1.02	RELATED REQUIREMENTS
A.	Section 07 9005 - Joint Sealers:  Perimeter sealant and back-up materials.
B.	Section 08 1100 - Aluminum Doors and Frames.
C.	Section 08 3200 - Sliding Glass Doors.
D.	Section 08 4413 - Glazed Aluminum Curtain Walls.
E.	Section 08 5113 - Aluminum Windows.
F.	Section 08 6300 - Metal-Framed Skylights.
G.	Section 08 8000 - Glazing.
H.	Section 09 9000 - Painting and Coating.
I.	Section 10 7113 - Sun Shades.
1.03	REFERENCE STANDARDS
1.04	ADMINISTRATIVE REQUIREMENTS
A.	System Supplier to provide Manufacturer with fabrication, assembly and installation training.
B.	System Supplier to perform inspections as needed.
1.05	SUBMITTALS
A.	See Section 01 3000 - Administrative Requirements, for submittal procedures.
B.	Product Data: Provide component dimensions.
C.	Shop Drawings: Indicate daylight opening dimensions, curtain wall schedule and elevations.
D.	System Supplier's Product Data: Include complete Order and Fabrication Manual extracts, maintenance and cleaning instructions.
E.	Report of field testing for water leakage.
1.06	QUALITY ASSURANCE
A.	System Supplier, Manufacturer and Installer Qualifications: Company specializing in fabrication and installation of commercial aluminum windows of types required, with not fewer than three years of experience.
1.07	DELIVERY, STORAGE, AND HANDLING
A.	Handle products of this section in accordance with AAMA CW-10.
B.	Protect finished aluminum surfaces with wrapping or strippable coating during installation.  Do not use adhesive papers or sprayed coatings that bond to aluminum when exposed to sunlight or weather.
1.08	FIELD CONDITIONS
A.	Do not install sealants when ambient temperature is less than 40 degrees F (5 degrees C).  Maintain this minimum temperature during and 48 hours after installation.
1.09	WARRANTY
A.	See Section 01 7800 - Closeout Submittals, for additional warranty documentation.
B.	Provide a two year material product warranty from the System Supplier starting on the date of delivery.
C.	Correct defective Work within a [   ] year period after Date of Substantial Completion.
D.	Provide [   ] year manufacturer warranty against failure of glass seal on insulating glass units, including interpane dusting or misting. Include provision for replacement of failed units. 
E.	Provide [   ] year manufacturer warranty against excessive degradation of exterior finish. Include provision for replacement of units with excessive fading, chalking, or flaking.
F.	Provide a System Design Representation Statement from the System Supplier.

PART 2  PRODUCTS
2.01	ACCEPTABLE SYSTEM SUPPLIER PRODUCTS
A.	Basis of Design:  Schuco (www.schuco-usa.com); Product: [FWS 60 SG; FWS 60 SG.SI].
B.	Product Description: Thermally broken structurally glazed aluminum framed curtain wall with 0.04 inch (1 mm) offset of horizontal mullion/transom to vertical mullion connection to prevent cut ends of horizontals becoming visible on the interior. Mullions and transoms are extruded aluminum rectangle boxes with flanges. The system supports varying thicknesses of glazed units with various sized isolators to meet the requirements. The IGU spacer is to be mechanically attached to the curtain wall framing.
2.02	CURTAIN WALL
A.	System Requirements: 
1.	Site or factory assembled, site glazed.
2.	Vertical mullion and horizontal mullion/transom sections to have a face width of 2-3/8 inches (60 mm).
3.	Horizontal mullions/transoms shall be notched and overlap the front face of vertical mullions at connections with dry set pressure seals inbetween.
4.	Air and Vapor Seal: Maintain continuous air barrier and vapor retarder throughout the system and surrounding assembly.
5.	Joint widths must be between 11/16" (18 mm) and 7/8" (22 mm) for wet sealing and dry glazing non-faceted systems.
6.	Insulated unit to incorporate 1-part aluminum spacer to mechanically retain the insulated glazing unit’s inner pane within the system.
B.	Performance Requirements:
1.	The positive design wind load of the project is [   ] psf ([   ] Pa).
2.	The negative design wind load of the project is [   ] psf ([   ] Pa).
3.	Design and size curtain wall to withstand the following load requirements, when tested in accordance with ASTM E 330 using test loads equal to 1.5 times the design wind load with 10 second duration of maximum load. No permanent deformation in excess of 0.2% of the clear span per AAMA 501.
4.	Member Deflection: Limit member deflection at design wind pressure to L / 175 for spans less than or equal to 13 ft 6 inches (4115 mm). For spans greater than 13 ft 6 inches (4115 mm) member deflection is equal to L / 240 + 1/4 inch (6.35 mm).
5.	Deflection: Maximum allowable deflection for any member supporting a single lite of glass shall not exceed 3/4 inch (19 mm).
6.	Air Infiltration and Exfiltration: Limit air infiltration through curtain wall assembly to 0.06 cu ft min/sq ft (0.30 L/s*sq meters) of wall area, measured at a differential of 6.27 psf (300 Pa) in accordance with ASTM E 283. 
7.	Acoustical Performance: STC rating of [   ]; OITC rating of [   ].
8.   Overall system profiles and gaskets to accommodate interstory vertical displacement of +/- 3/8” (9 mm) when tested in accordance with AAMA 501.4. The curtain wall shall pass the following:
	a.   All functions remain unimpaired with no visible damage.
	b.   Post-design displacement performance (e.g. air infiltration, water leakage, structural      
   performance, etc) shall remain within specified allowable limits without adjustments or 
   repair.
9.	Overall system profiles and gaskets to accommodate interstory horizontal displacement of +/- 3/4” (19 mm) when tested in accordance with AAMA 501.4. The curtain wall shall pass the following: 
	a.   All functions remain unimpaired with no visible damage. 
	b.   Post-design displacement performance (e.g. air infiltration, water leakage, structural performance, etc.) shall remain within specified allowable limits without adjustments or repair.
10.  Overall system profiles and gaskets to accommodate interstory horizontal displacement of +/- 2-1/8” (54 mm) when tested in accordance with AAMA 501.4. The curtain wall shall pass the following:
	a.   No glass breakage or glass fallout is allowed.
	b.   No wall components may fall off. Trim may not be visibly disengaged. 
11.  Dynamic Seismic Drift: The system shall be suitable for use in seismic regions and have an overall glass Δfallout of 5-3/4” (146 mm) when tested in accordance with AAMA 501.6 for dynamic seismic movement.  
C.	Curtain Wall Structural Glazing Type Specific Performance and System Requirements:
1.	External joint with U-shaped dry glazing:
a.	System: FWS 60 SG.
b.	Isolators to be made of high density PVC and at least 11/16 inch (17 mm) in depth.
c.  	Water infiltration (static pressure): No uncontrolled water ingress at a static pressure difference of [   ] psf ([   ] Pa) when tested at a rate of 5 gallons/sq ft pressure for 15 minutes in accordance with ASTM E331.
d.	Drainage: 
1)	Overall/System ventilation and drainage: Overall pressure equalization and system drainage occurs by draining downward from higher horizontal mullion/transom levels to lower vertical mullion levels to the exterior in a controlled manner via drainage channels and deflector/ventilation blocks. System shall be fully ventilated to equalize air pressure. 
e.	Condensation Resistance Factor: For the frame of CRF_f [   ] or better in accordance with AAMA 1503 using insulated glass unit with 3/4 inch (20 mm) aluminum spacer.
f.	Overall system to have NFRC 100 Standardized U-value U_st of [   ] BTU/(h*sq ft*degrees F) ([   ] W/(sq meters*degrees K)) when glazed with insulated glass unit having center of glass winter U-value of 0.29 and aluminum spacers.
g.	U-value of glazed assembly to be [   ] BTU/(h*sq ft*degrees F) ([   ] W/(sq meters*degrees K)) per AAMA 507 or NFRC 100 simulation.
2.	External joint with flush fitted dry glazing:
a.	System: FWS 60 SG.
b.	Isolators to be made of high density PVC and at least 11/16 inch (17 mm) in depth.
c.	Water infiltration (static pressure): No uncontrolled water ingress at a static pressure difference of [   ] psf ([   ] Pa) when tested at a rate of 5 gallons/sq ft pressure for 15 minutes in accordance with ASTM E331.
d.	Drainage: [Overall/System ventilation and drainage; Field ventilation and drainage] to be used.
1)	Overall/System ventilation and drainage: Overall pressure equalization and system drainage occurs by draining downward from higher horizontal mullion/transom levels to lower vertical mullion levels to the exterior in a controlled manner via drainage channels and deflector/ventilation blocks. System shall be fully ventilated to equalize air pressure. 
2)	Field ventilation and drainage: Pressure equalization and drainage occurs for each field via the horizontal mullion/transom rebate base. The horizontal mullion/transom rebate base is joined to the vertical mullion rebate base with a seal. The pressure is equalized via notches in the ventilation block in the horizontal mullion/transom. Condensation shall be drained from vertical mullion levels into overlapping horizontal mullion/transom levels and out to the exterior.
e.	Condensation Resistance Factor: For the frame of CRF_f [   ] or better in accordance with AAMA 1503 using insulated glass unit with 3/4 inch (20 mm) aluminum spacer.
f.	Overall system to have NFRC 100 Standardized U-value U_st of [   ] BTU/(h*sq ft*degrees F) (2.27 W/(sq meters*degrees K)) when glazed with 1 inch  insulated glass unit having center of glass winter U-value of 0.29 and aluminum spacers.
g.	U-value of glazed assembly to be [   ] BTU/(h*sq ft*degrees F) ([   ] W/(sq meters*degrees K)) per AAMA 507 or NFRC 100 simulation.
3.	External joint with wet sealing:  
a.	System: [FWS 60 SG; FWS 60 SG.SI].
b.	Isolators to be made of high density PVC and at least 11/16 inch (17 mm) in depth.
c.  	Water infiltration (static pressure): No uncontrolled water ingress at a static pressure difference of 15 psf (718 Pa) when tested at a rate of 5 gallons/sq ft pressure for 15 minutes in accordance with ASTM E331.
d.	Drainage: 
1)	Overall/System ventilation and drainage: Overall pressure equalization and system drainage occurs by draining downward from higher horizontal mullion/transom levels to lower vertical mullion levels to the exterior in a controlled manner via drainage channels and deflector/ventilation blocks. System shall be fully ventilated to equalize air pressure. 
e.	System: FWS 60 SG.
1)	Condensation Resistance Factor: For the frame of CRF_f [   ] or better in accordance with AAMA 1503 using insulated glass unit with 3/4 inch (20 mm) aluminum spacer.
2)	Overall system to have NFRC 100 Standardized U-value U_st of [   ] BTU/(h*sq ft*degrees F) (2.30 W/(sq meters*degrees K)) when glazed with insulated glass unit having center of glass winter U-value of 0.29 and aluminum spacers.
3)	U-value of glazed assembly to be [   ] BTU/(h*sq ft*degrees F) ([   ] W/(sq meters*degrees K)) per AAMA 507 or NFRC 100 simulation.
f.	System: FWS 60 SG.SI.
1)	Condensation Resistance Factor: For the frame of CRF_f [   ] or better in accordance with AAMA 1503 using insulated glass unit with 3/4 inch (20 mm) aluminum spacer.
2)	Overall system to have NFRC 100 Standardized U-value U_st of [   ] BTU/(h*sq ft*degrees F) (2.27 W/(sq meters*degrees K)) when glazed with insulated glass unit having center of glass winter U-value of 0.29 and aluminum spacers.
3)	U-value of glazed assembly to be [   ] BTU/(h*sq ft*degrees F) ([   ] W/(sq meters*degrees K)) per AAMA 507 or NFRC 100 simulation.
2.03	COMPONENTS AND ACCESSORIES
A.	Structural Reinforcement: Insert profiles shall be extruded aluminum and/or steel and located inside mullion and/or transom profiles to meet structural requirements. 
B.	Deflector Block/Ventilation Block: Inserted into mullion at top and bottom of spans as well as above every vertical mullion splice joint or at a maximum distance of 26 feet (8m) or less than 8 glazing fields in height per System Supplier's recommendations.
C.	Glass retention clips shall be attached with stainless steel grade fixing screws.
D.	Insert Units:
1.	Provide thermally broken aluminum framed [operable aluminum windows; horizontal sliding aluminum doors; aluminum doors].
a.	Refer to Section 08 5113 for operable aluminum windows.
b.	Refer to Section 08 3200 for horizontal sliding aluminum doors.
c.	Refer to Section 08 1116 for aluminum doors.
E.	Operable Skylights: 
1.	Must be consistent assembly with curtain wall System Supplier.
2.	Minimum pitch of 7 degrees and maximum pitch of 75 degrees.
3.	Glazing beads to have [concealed; visible] screw fixings.
4.	Must have additional center gasket between outer frame and vent profile.
5.	Refer to Section 08 6300 for more information on metal-framed skylights.
F.	Sloped glazed areas: Must be consistent assembly with curtain wall System Supplier.
G.	Sealants shall be compatible with designated sealing surfaces per System Supplier's recommendations. 
H.	Sun shades:
1.	Attach passive or active sun shades with aluminum brackets
a.	Refer to Section 10 7113 for sun shades
2.04	MATERIALS  
A.	Extruded Aluminum:  ASTM B221 (ASTM B221M), 6063 alloy, T6 temper.
B.	Inner glazing gasket: EPDM
C.	Deflector blocks: EPDM
D.	Ventilation blocks: Silicone.
E.	1 Part spacer: Extruded Aluminum: ASTM B221 (ASTM B221M), 6063 alloy, T6 temper.
F.	Flush Fitted dry gasket: EPDM.
G.	U-shaped dry gasket: Silicone.
H.	Structural Glazing Adhesive: Silicone, neutral core; formulated specifically for structural sealant glazing and complying with ASTM C1184. 
1.	Ultraviolet radiation resistant for 2000 to 4000 micro-watts minimum for 21 days.
2.	Adhesion when subjected to ultraviolet radiation through glass in accordance with ASTM C794 without failure.
3.	Minimum adhesion tensile strength of [   ] psi ([   ] kPa).
4.	Tested for compatibility with glazing accessories and weatherseal sealant.
5.	Manufacturers:
a.	Dow Corning: www.dowcorning.com
b.	Sika Services AG: www.sika.com
c.	Momentive Performance Materials, Inc (formerly GE Silicones): www.momentive.com
I.	Approved aluminum spacer fabricators: IGU constructed with aluminum spacer must be fabricated accordingly by an approved IGU fabricator. Contact Schuco USA for approved fabricators. 
J.	Glazing:  As specified in Section 08 8000. 
2.05	FINISHES
A.	Class I Natural Anodized Finish:  AAMA 611 AA-M12C22A41 Clear anodic coating or AAMA 612 clear anodic coating with electrolytically deposited organic seal; not less than 0.7 mils (0.018 mm) thick.
B.	Class II Natural Anodized Finish:  AAMA 611 AA-M12C22A31 Clear anodic coating not less than 0.4 mils (0.01 mm) thick.
C.	Class I Color Anodized Finish:  AAMA 611 AA-M12C22A42 Integrally colored anodic coating or AAMA 612 electrolytically deposited colored anodic coating with electrolytically deposited organic seal; not less than 0.7 mils (0.018 mm) thick.
D.	Class I Color Anodized Finish:  AAMA 611 AA-M12C22A44 electrolytically deposited colored anodic coating not less than 0.7 mils (0.018 mm) thick.
E.	Class II Color Anodized Finish:  AAMA 611 AA-M12C22A32 Integrally colored anodic coating not less than 0.4 mils (0.01 mm) thick.
F.	Anodized Plus Natural Anodized Finish: AAMA 612 clear anodic coating with electrolytically deposited organic seal not less 0.7 mils (0.02 mm) thick.
G.	Anodized Plus Color Anodized Finish: AAMA 612 electrolytically deposited colored anodic coating with electrolytically deposited organic seal not less 0.7 mils (0.02 mm).
H.	Superior Performance Organic Coating System: AAMA 2605 multiple coat, thermally cured polyvinylidene fluoride system.
I.	High Performance Organic Finish:  AAMA 2604; multiple coats, thermally cured fluoropolymer system.
J.	Pigmented Organic Coating System:  AAMA 2603; polyester or acrylic baked enamel finish.
K.	Color:  As shown on the drawings.
L.	Touch-Up Materials:  As recommended by coating manufacturer for field application.

PART 3  EXECUTION
3.01	EXAMINATION
A.	Verify dimensions, tolerances, and method of attachment with other work.
B.	Verify that wall openings and adjoining air and vapor seal materials are ready to receive work of this section.
C.	Verify that anchorage devices have been properly installed and located.
3.02	INSTALLATION
A.	Install curtain wall system in accordance with System Supplier's instructions.
B.	Attach to structure to permit sufficient adjustment to accommodate construction tolerances and other irregularities.
C.	Provide alignment attachments and shims to permanently fasten system to building structure.
D.	Align assembly plumb and level, free of warp or twist.  Maintain assembly dimensional tolerances, aligning with adjacent work.
E.	Install sill flashings.  Turn up ends and edges; seal to adjacent work to form water tight dam.
F.	Coordinate attachment and seal of perimeter air and vapor barrier materials.
G.	Touch-up minor damage to factory applied finish; replace components that cannot be satisfactorily repaired.
H.	The surface properties of the aluminum profiles and the aluminum spacers must correspond to Schuco specifications and those of the adhesive suppliers.
I.	The anodized surface must be bonded within six months of the profile being anodized.
3.03	TOLERANCES
A.	Maximum Variation from Plumb:  0.06 inches every 3 ft (1.5 mm/m) non-cumulative or 0.5 inches per 100 ft (12 mm/30 m), whichever is less.
B.	Maximum Misalignment of Two Adjoining Members Abutting in Plane: 1/32 inch (0.8 mm).
C.	Sealant Space Between Curtain Wall Mullions and Adjacent Construction:  Maximum of 3/4 inch (19 mm) and minimum of 1/4 inch (6 mm).
3.04	FIELD QUALITY CONTROL
A.	Provide the services of the Manufacturer's field representative to observe installation and make report.
B.	See Section 01 4000 - Quality Requirements, for general requirements for testing and inspection.

3.05	CLEANING
A.	Remove protective material from pre-finished aluminum surfaces.
B.	Wash down surfaces with a solution of mild detergent in warm water, applied with soft, clean wiping cloths.  Take care to remove dirt from corners.  Wipe surfaces clean.
C.	Remove excess sealant by method acceptable to sealant manufacturer.

3.06	PROTECTION
A.	Protect installed products from damage during subsequent construction.
END OF SECTION

Disclaimer:  Schüco USA LLLP has written this sample specification as an aid to a professionally qualified design professional.  Schüco shall not be responsible for the use of this specification in project construction documents.  The use of this specification requires the sole professional judgment and expertise of a qualified design professional to adapt the information in this specification to the specific needs of the project, to coordinate with the construction documents, and to meet all applicable building codes, regulations and laws.  THEREFORE, SCHÜCO EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTY INCLUDING THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE.

FWS 60 SG_FWS 60 SG.SI 	08 4413 -  	GLAZED ALUMINUM CURTAIN WALLS