08800_en.doc

SECTION 08800

GLAZING

PART 1 - GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

ITALIAN/EUROPEAN HARMONIZATION STANDARDS (UNI EN)(UNI ENV)(UNI EN ISO)

UNI EN 572-2

(1996) Glass in Building - Basic Sode Lime Silicate Glass Products. Part 2: Float Glass.

INTERNATIONAL STANDARDS ORGANIZATION (ISO)

ISO 11600

(1993) Building Construction - Sealants - Classification and Requirements.

Italian National Institute for the Unification of Standards (UNI) Publications:

UNI 6534

(1974) Glazing In Building Construction - Design, Materials and Installation.

UNI EN 12150-1

(2001) Glazing Building Construction - Tempered Safety Glass Definitions and Descriptions.

UNI EN ISO 12543-1-6

(2000) Glazing in Building Construction - Laminated and Laminated Safety Glass Definitions and Descriptions of Components/Appearance.

UNI 7697

(2002) Safety Criteria for Glazing.

UNI 10593/1

(1996) Glass for Building Construction, Insulating Glass - Generalities and Dimensional Tolerances.

UNI 10593/2

(1996) Glass for Building Construction, Insulating Glass - Tests of Aging, Measurement of Penetration of Water Vapor and Requirements.

UNI 10593/3

(1996) Glass for Building Construction, Insulating Glass - Initial Type of Tests for the Measurement of the Speed of the Loss of Gas from Insulated Glass Filled with Gas.

UNI 10593/4

(1996) Glass for Building Construction, Insulating Glass - Method of Tests for Determining the Physical Properties of Sealing the Edges.

1.2 SUBMITTALS

Submit the following:

1.2.1 Product Data

Clear Glass

Laminated Glass

Tempered Glass

Insulated Glass Unites

1.2.2 Manufacturer's Instructions

Setting and sealing materials

Glass setting

Submit glass manufacturer's recommendations for setting and sealing materials and for installation of each type of glazing material specified. Include cleaning instructions for plastic sheets.

1.3 DELIVERY, STORAGE, AND HANDLING

Deliver products to the site in unopened containers, labeled plainly with manufacturers' names and brands. Store glass and setting materials in safe, dry locations and do not unpack until needed for installation. Handle and install materials in a manner that will protect them from damage.

1.4 ENVIRONMENTAL REQUIREMENTS

Do not start glazing work until the outdoor temperature is above 4 degrees C and rising, unless procedures recommended by the glass manufacturer and approved by the Contracting Officer’s Technical Representative are made to warm the glass and rabbet surfaces. Provide ventilation to prevent condensation of moisture on glazing work during installation. Do not perform glazing work during damp or rainy weather.

1.5 WARRANTY

1.5.1 Warranty for Insulating Glass Units

Warranty insulating glass units against development of material obstruction to vision (such as dust or film formation on the inner glass surfaces) caused by failure of the hermetic seal, other than through glass breakage, for a 5-year period following acceptance of the work. Provide new units for any units failing to comply with terms of this warranty within 45 working days after receipt of notice from the Government.

PART 2 - PRODUCTS

2.1 GLASS

In doors and sidelights, provide safety glazing material conforming to UNI 7697.

2.1.1 Clear Glass

Unless otherwise indicated, provide clear float glass meeting the requirements of UNI EN 572-2 with the following minimum requirements. Use double-strength sheet glass or 3 mm float glass for openings up to and including 1.39 square meters, 4.5 mm for glazing openings over 1.39 square meters but not over 2.79 square meters, and 6 mm for glazing openings over 2.79 square meters but not over 4.18 square meters.

a.

Thickness as indicated, but not less than 3 mm.

b.

Spot faults category A, 0.5 mm maximum.

c.

Optional faults: none when viewed at an angle of 50 degrees.

Provide glass in the following thickness:

Up to 1.4 square meters: 3 mm.

From 1.4 to 2.8 square meters: 4.5 mm.

From 2.8 to 4.2 square meters: 6.0 mm.

2.1.2 Laminated Glass

Provide laminated glass meeting the requirements of UNI EN ISO 12543-1-6 fabricated of two pieces of float glass in accordance with the paragraph entitled, "Clear Glass", laminated together with a clear polyvinyl butyral (PVB) interlayer. The total thickness shall be as required to resist blast pressure loading indicated in Sections 08120 and 08520, thickness shall be not less than 7.5 mm (3 mm + 1.52 mm PVB + 3 mm). For the windows indicated in Section 08520, paragraph 2.1.g, the laminated glass shall have the total thickness of 12 mm, as minimum, (3x3 mm glass panes + 2x1.52 mm PVB).

2.1.3 Tempered Glass

Provide fully tempered glass meeting the requirements of UNI EN 12150-1 in thickness indicated but not less then 6 mm thick and wherever safety glazing material is indicated or specified. The glass shall be green tinted in compliance with the Aviano Air Base Design Guide.

2.2

INSULATING GLASS UNITS

Two panes of glass separated by a dehydrated airspace and hermetically sealed. Dimensional tolerances shall be as specified in UNI 10593/1. The units shall meet the requirements of UNI 10593/2, UNI 10593/3, UNI 10593/4.

2.2.1 Glazing Requirements Building

Provide insulating glass (vetrocamera) with a 12 mm airspace as minimum, unless otherwise noted, a laminated inner pane of glass meeting the requirements of the blast pressure loads indicated in Sections 08120 e 08520 and in compliance with paragraph 2.1.2, and a 6 mm thick minimum outer pane of glass meeting the requirements of UNI EN 12150-1.

2.3 SETTING AND SEALING MATERIALS

Provide as per manufacturer's recommendations, unless specified otherwise herein. Do not use metal sash putty, nonskinning compounds, nonresilient preformed sealers, or impregnated preformed gaskets. Materials exposed to view and unpainted shall be gray or neutral color.

2.3.1 Elastomeric Sealant

ISO 11600, Glazing, 12.57 expandability. Use for channel or stop glazing and metal sash. Sealant shall be chemically compatible with setting blocks, edge blocks, and sealing tapes, with sealants used in manufacture of insulating glass units. Color of sealant shall be gray.

2.3.2 Sealing Tapes

Preformed, semisolid, polymeric-based material of proper size and compressibility for the particular condition. Use only where glazing rabbet is designed for tape and tape is recommended by the glass or sealant manufacturer. Provide spacer shims for use with compressible tapes. Tapes shall be chemically compatible with the product being set.

2.3.3 Setting Blocks and Edge Blocks

Lead or neoprene of 70 to 90 Shore "A" durometer hardness, chemically compatible with sealants used, and of sizes recommended by the glass manufacturer.

2.3.4 Accessories

Provide as required for a complete installation, including glazing points, clips, shims, angles, beads, and spacer strips. Provide noncorroding metal accessories. Provide primer-sealers and cleaners as recommended by the glass and sealant manufacturers.

PART 3 - EXECUTION

3.1 PREPARATION

Preparation, unless otherwise specified or approved, shall conform to applicable requirements of UNI 6534 and manufacturer's recommendations.

Determine the sizes to provide the required edge clearances by measuring the actual opening to receive the glass. Grind smooth in the shop glass edges that will be exposed in finish work. Leave labels in place until the installation is approved, except remove applied labels on heat-absorbing glass and on insulating glass units as soon as glass is installed. Securely fix movable items or keep in a closed and locked position until glazing compound has thoroughly set.

3.2

GLASS SETTING

Shop glaze or field glaze items to be glazed using glass of the quality and thickness specified or indicated. Glazing, unless otherwise specified or approved, shall conform to applicable requirements of UNI 6534, and manufacturer's recommendations. Aluminum windows, wood doors, and steel doors may be glazed in conformance with one of the glazing methods described in the standards under which they are produced, except that face puttying with no bedding will not be permitted. Handle and install glazing materials in accordance with manufacturer's instructions. Use beads or stops which are furnished with items to be glazed to secure the glass in place.

3.2.1 Sheet Glass

Cut and set with the visible lines or waves horizontal.

3.2.2 Insulating Glass Units

Do not grind, nip, or cut edges or corners of units after the units have left the factory. Springing, forcing, or twisting of units during setting will not be permitted. Handle units so as not to strike frames or other objects. Installation shall conform to applicable requirements of UNI 6534.

3.2.3 Installation of Laminated Glass

Sashes which are to receive laminated glass shall be weeped to the outside to allow water drainage into the channel.

3.3 CLEANING

Clean glass surfaces and remove labels, paint spots, putty, and other defacement as required to prevent staining. Glass shall be clean at the time the work is accepted. Clean plastic sheet in accordance with manufacturer's instructions.

-- End of Section --

Section 08800

Section 08800