General Construction Specifications
PART 1 - GENERAL
01 SECTION INCLUDES
A. Exterior glass block work with mortar and accessories.
02 REFERENCE STANDARDS
A. ASTM A36 - Structural Steel.
B. ASTM A82 - Steel Wire, Plain, for Concrete Reinforcement.
C. ASTM A153 - Zinc-Coating (Hot-Dip) on Iron and Steel Hardware.
D. ASTM A580 - Stainless and Heat-Resisting Steel Wire.
E. ASTM A641 - Zinc-Coated (Galvanized) Carbon Steel Wire.
F. ASTM C144 - Aggregate for Masonry Mortar.
G. ASTM C150 - Portland Cement.
H. ASTM C270 - Mortar for Unit Masonry.
I. ASTM E163 - Fire Tests of Window Assemblies.
1.02 QUALITY ASSURANCE
A. Single Source Responsibility: Obtain materials for glass unit masonry from a single source for each type of material required.
B. Masonry Contractor shall have a skilled foreman on site at all times during block work to supervise all work of this section.
C. Mock-Up Panel: Provide mock-up consisting of 4 glass blocks, reinforcement and mortar joints under provisions of Section 01340.
1.03 SUBMITTALS
A. Manufacturer's product data indicating full compliance with requirements of this section for:
1. Glass block
2. Masonry ties
3. Mortar
B. Samples: For Architect's review and selection.
C. Mock-up Panel: For Architect's review and to establish minimum standards of workmanship.
1.04 DELIVERY, STORAGE, AND HANDLING
A. Protect glass block, aggregate, and cementitious materials during storage and construction from damage, corrosion, soiling and moisture.
PART 2 - PRODUCTS
03 GLASS BLOCK
A. Type: Solid glass block equal to Vista Brick as manufactured by Pittsburgh Corning Corporation
B. Size: 8" x 8" x 3".
C. Patterns: Transparent.
D. Glass block shall be bullet resistant and have been tested in accordance with the British Standard Ballistic Test - B.S.5051 or equivalent test procedure.
E. Acceptable Manufacturers:
1. Pittsburgh Corning Corp.
2. Saint-Gobain.
3. Westerwald A.G.
2.02 MORTAR
A. Portland Cement: ASTM C150, Type 1, colored mortar:
1. For color consistency cement shall be from a single source.
2. Calcium chloride is not permitted.
B. Hydrated Lime: ASTM C207, Type S.
C. Aggregate for Mortar: ASTM C144
D. Water: Drinkable, free of substances capable of having a deleterious effect on mortar or glass unit masonry.
2.03 ACCESSORIES
A. Panel (Joint) Reinforcement for Interior and Exterior Panels: Hot-dipped galvanized ladder-type welded wire units prefabricated with deformed continuous side rods and plain cross rods into straight lengths of not less than 10'. Space as indicated on Drawings.
B. Panel Anchors: Glass unit masonry manufacturer's standard perforated steel strips, 0.0359" uncoated thickness x 1-3/4" wide x 24" long, hot-dip galvanized after perforating to comply with ASTM A153, Class B.
C. Asphalt Emulsion: Water-based asphalt emulsion of type recommended by glass unit masonry manufacturer.
D. Sealant and Backer Rod: As specified in Section 07920 - Joint Sealers.
E. Glass Fiber Expansion Strips: Glass fiber strips complying with requirements of glass block manufacturer, 4-pound density, 3/8" thick x 24" long x width indicated on Drawings.
PART 3 - EXECUTION
04 EXAMINATION
A. Examine sills, jambs and heads surrounding glass unit masonry panels to verify that they are complete and of correct size and location to receive glass unit masonry.
B. Beginning installation means acceptance of existing conditions.
05 INSTALLATION
A. Locate and secure perimeter framing as shown on the drawings.
B. Sill, Head and Jamb Preparation: Apply a heavy coat of asphalt emulsion to sill; allow to dry before placing mortar. Adhere expansion strips to jambs and heads with gobs of asphalt emulsion, taking care to extend expansion strips to sill.
C. Setting Glass Unit Masonry: Set first and succeeding courses of glass unit masonry with completely filled bed and head mortar joints. Furrowing not permitted. Lay-up glass unit masonry plumb with courses level, accurately spaced and coordinated with other work; maintain joint widths indicated.
D. Use rubber mallet to tap units into position; do not use steel tools and do not allow units to come into contact with metal accessories and frames.
E. Keep expansion joints free of mortar.
F. Rake out mortar from joints in exterior panels to a uniform depth equal to joint width to accommodate pointing material.
G. Fill raked joints and voids with pointing mortar. Apply in layers; fully compact each layer and allow to become thumbprint hard before applying next layer.
H. Pointing of joints in exterior walls with sealant, including installation of joint fillers after final mortar set, is specified in Division-7 Section "Joint Sealers".
I. Tool exposed joints slightly concave using a jointer larger than joint width; perform tooling while mortar is still plastic and before it takes final set.
J. Install panel reinforcing in horizontal joints at spacing indicated and to run continuously from end to end of panels. Comply with the following:
1. Do not bridge expansion joints with panel reinforcing.
2. Place panel reinforcing in joints immediately above and below all openings within glass unit masonry panels.
3. Lap panel reinforcing not less than 6" where more than one length is necessary.
4. Embed panel reinforcing in mortar bed by placing lower half of mortar bed first, then pressing panel reinforcing into place and covering with upper half of mortar bed and then troweling it smooth.
B. Install panel anchors at locations indicated and in same horizontal joints where panel reinforcing occurs. Extend panel anchors at least 12" into joint and bend within expansion joints at edges of panels.
C. Install expansion strips at jambs, heads, mullions and other locations indicated.
3.02 CLEANING
A. Clean glass unit masonry after mortar has attained final set but before it has dried on block surfaces by use of scrub brush with stiff fiber bristles and damp cloth. Do not use abrasive cleaners, steel wool or wire brush.
END OF SECTION
