SECTION 04270

GLASS UNIT MASONRY

PART 1 GENERAL

SECTION INCLUDES

Glass masonry units.

Mortar bedding and pointing [mortar.] [sealant.]

Perimeter chase.

PRODUCTS INSTALLED BUT NOT FURNISHED UNDER THIS SECTION

Section [_____ - __________:] Metal edge trim[.] [and flashings.]

RELATED SECTIONS

Section 04100 - Mortar: Mortar [and grout] for glass unit masonry.

Section [_____ - __________:] [Unit masonry] [__________] system.

Section [_____ - __________:] Lintel construction over glass unit masonry.

Section [_____ - __________:] Sill [and flashing] construction under glass unit masonry.

Section [_____ - __________:] Flashings for [_____.]

Section 07900 - Joint Sealers: Perimeter calking[.] [and sealant tooled joints.]

Section [_____ - __________:] Operating [vents] [windows] with glass unit masonry wall.

REFERENCES

ASTM A123 - Zinc (Hot-Galvanized) Coatings of Products Fabricated from Rolled, Pressed, and Forged Steel Shapes, Plates, Bars, and Strips.

ASTM C780 - Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry.

IMIAC - International Masonry Industry All-Weather Council: Recommended Practices and Guide Specifications for Cold Weather Masonry Construction.

SUBMITTALS

Submit product data under provisions of Section [01300.] [01340.]

Submit product data for glass units, [accessories][,][.] [and] [_______________.]

Submit samples under provisions of Section [01300.] [01340.]

Submit [two] [four] [_____] glass units [and [two] [_____] curved units] illustrating size variations, color, design, and face pattern[.] [and] [_______________.]

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

QUALIFICATIONS

Installer: Company specializing in performing the work of this Section [with minimum [_____] years [documented] experience.] [approved by manufacturer.]

MOCK-UP

Provide mock-up of glass units, reinforcement, and mortar under provisions of Section [01400.] [01405.]

Provide review [and testing] of mock-up under provisions of Section [01400][.] [01410][.] [and ASTM C780.]

Construct a mock-up panel of [_____ x _____] feet ([_____ x _____] m) size, containing glass units with head, jamb, and sill conditions.

When accepted, mock-up will demonstrate minimum standard for the Work. Mock-up may [not] remain as part of the Work.

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Accept glass units on site on pallets. Inspect for damage.

ENVIRONMENTAL REQUIREMENTS

Maintain materials and ambient air temperatures to minimum 50 degrees F (10 degrees C) prior to, during, and 48 hours after completion of work.

****** [OR] ******

Cold Weather Requirements: IMIAC - Recommended Practices and Guide Specifications for Cold Weather Masonry Construction.

FIELD MEASUREMENTS

Verify field measurements are as [shown on [Drawings.]

[shop drawings.]] [instructed by the manufacturer.]

EXTRA MATERIALS

Submit maintenance materials under provisions of Section [01700.] [01750.]

Furnish [ten] [_____] of each type and size of glass unit to the Owner.

PART 2 PRODUCTS

ACCEPTABLE MANUFACTURERS

[____________________________] Product [__________.]

[____________________________] Product [__________.]

[____________________________] Product [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

GLASS UNITS

Hollow Glass Units: [Unit core filled with white thermal insulation;] [special corner units][.] [curved units][.] [and] [__________.] Permanently seal hollow unit by heat fusing joint[.] [with joint key to assist mortar bond.]

Nominal Size: [_____ x _____ x _____] inch

([_____ x _____ x _____] mm).

Color: [clear] [bronze tint] [gray tint] glass.

Pattern and Design: [_______________________.]

Insulation Value: 'U' value of [_____] BTU/sq ft/h/degree F ([_____] W/sq m/degree C).

Compressive Strength: [400 - 600] [_____] psi ([2.8 -4.1] [_____] MPa).

Visible Light Transmittance: [_____] percent.

Shading Coefficient: [__________________.]

Acoustic Sound Loss: [_____] decibels.

Solid Glass Units: [Special corner units][;] [curved units][;] [and] [__________;] [with joint key to assist mortar bond.]

Nominal Size: [_____ x _____ x _____] inch

([_____ x _____ x _____] mm).

Color: [clear] [bronze tint] [gray tint] glass.

Pattern and Design: [_______________________.]

Compressive Strength: [400 - 600] [_____] psi ([2.8 -4.1] [_____] MPa).

Visible Light Transmittance: [_____] percent.

Shading Coefficient: [__________________.]

Acoustic Sound Loss: [_____] decibels.

ACCESSORIES

Panel Reinforcing: Two [9] [_____] gage ([4] [_____] mm) rods spaced [2] [_____] inches ([50] [_____] mm) apart with [14] [_____] gage ([1.8] [_____] mm) cross rods welded [8] [_____] inches ([200] [_____] mm) oc, galvanized after fabrication to 1.25 oz/sq ft (380 q/sq m) in accordance with ASTM A123.

Expansion Strips: [7/16 x 4] [_____ x _____] inches ([11 x 100] [_____ x _____] mm) nominal size, dense glass fiber matting.

Panel Anchors: [20] [_____] gage ([0.9] [_____] mm) x [1-3/4] [_____] inch ([44] [_____] mm) wide steel strips, punched with three rows of elongated holes, pattern staggered, hot dip galvanized after fabrication to 1.25 oz/sq ft (380 gm/sq m) in accordance with ASTM A123.

Perimeter Chase: [Extruded] [Formed] aluminum channel profile, [4-3/4 x 1-1/4 x 1/8] [_____ x _____ x _____] inch ([120 x 32 x 3] [_____ x _____ x _____] mm) size, one piece per length installed, [natural] [anodized to [_____] color] finish.

Asphalt Emulsion: Water based asphalt emulsion.

Sealant: [Acrylic] [__________] type, [__________] manufactured by [_______________,] of color selected.

****** [OR] ******

Sealant: As specified in Section [07900.] [_____.]

PART 3 EXECUTION

EXAMINATION

Verify that openings are ready to receive work.

Beginning of installation means installer accepts existing substrate and conditions.

PREPARATION

Clean glass units of foreign substances.

Establish and protect lines, levels, and coursing.

Protect elements surrounding the work of this Section from damage and disfiguration.

INSTALLATION

Erect glass units and accessories in accordance with manufacturer's instructions.

Locate and secure perimeter metal chase.

Coat [sill] [surface] under units with asphalt emulsion as a bond breaker, and allow to dry.

Set panel anchors in mortar bed directly over coating.

Provide full mortar joints. Furrowing not permitted. Remove excess mortar.

Maintain uniform joint width of [1/4] [_____] inch ([6] [_____] mm).

Place panel reinforcing at every [second] [_____] horizontal joint in full mortar bed and at first course above and below openings within the glass unit panel. Lap joints 6 inches (150 mm). Discontinue reinforcement at expansion joints.

Isolate panel from adjacent construction on sides and top with expansion strips[.] [concealed within perimeter trim.] Keep expansion joint voids clear of mortar.

Shore assembly until setting bed will maintain panel in position without movement.

To accommodate pointing [mortar,] [sealant,] rake out joints 5/8 to 3/4 inch (16 to 19 mm).

****** [OR] ******

Rake out joint [_____] inch ([_____] mm) to accommodate sealant.

Fill joints with pointing mortar. Pack into voids. Neatly tool surface to a [concave] [raked] [_____] profile.

****** [OR] ******

Place sealant in mortar joints in accordance with Section

07900.	Tool surface to a [concave] [raked] [_____]

profile.

Remove excess mortar[.] [and sealant.]

Vacuum clean mortar joints.

TOLERANCES

Variation from Joint Width: Plus or minus [1/8] [_____] inch ([3] [_____] mm) and minus 0 inches (0 mm).

Maximum Variation from Plane of Unit to Adjacent Unit: [1/32] [_____] inch ([1] [_____] mm).

Maximum Variation of Panel from Plane: [1/8] [_____] inch ([3] [_____] mm).

CLEANING

Clean Work under provisions of [01700.] [01710.]

Do not scratch or deface units.

PROTECTION OF FINISHED WORK

Protect finished installation under provisions of Section [01500.] [01535.]

Maintain protective boards at exposed external corners. Provide protection without damaging completed work.

END OF SECTION