SPECIAL SPECIFICATION

SECTION 04270

[GLASS UNIT MASONRY]{.underline}

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PART 1 - GENERAL

1.01 Related Documents
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1.02 References
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1.03 Summary
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1.04 Submittals
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1.05 Quality Assurance
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1.06 Delivery, Storage, and Handling
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1.07 Project Conditions
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PART 2 - PRODUCTS

2.01 Manufacturers
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2.02 Glass Block
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2.03 Mortar Materials
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2.04 Glass Unit Masonry Accessories
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2.05 Mortar Mixes
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PART 3 - EXECUTION

3.01 Examination
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3.02 Preparation
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3.03 Installation, General
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3.04 Setting Glass Unit Masonry
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3.05 Cleaning
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SPECIAL SPECIFICATION

SECTION 04270

[GLASS UNIT MASONRY]{.underline}

PART 1 - GENERAL

1.01 [RELATED DOCUMENTS]{.underline}

A. Drawings and general provisions of Contract, including General and
Supplementary Conditions and Division 1 Specification Sections, apply to
this Section.

1.02 [REFERENCES]{.underline}

A. [American Society of Testing and Materials (ASTM)]{.underline}

A82 Specification for Steel Wire, Plain, for Concrete Reinforcement

A153 Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware

A307 Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile
Strength

B633 Specification for Normalized High-Strength Low-Allow Structural
Steel

C144 Specification for Aggregate for Masonry Mortar

C150 Specification for Portland Cement

C207 Specification for Hydrated Lime for Masonry Purposes

C270 Specification for Mortar for Unit Masonry

E163 Methods of Fire Tests of Window Assemblies

E488 Test Methods for Strength of Anchors in Concrete and Masonry
Elements

1.03 [SUMMARY]{.underline}

A. [This Section includes the following]{.underline}:

1\. Exterior panels.

1.04 [SUBMITTALS]{.underline}

A. [General]{.underline}: Submit the following in accordance with
Conditions of Contract and Division 1 Specification Sections.

B. Product data for each type of product specified including glass
block, cementitious materials, waterproofing admixtures for mortar, and
glass unit masonry accessories.

C. Samples for verification purposes in form of sample panels consisting
of full-size glass block units for each form, pattern, and color
indicated with mortar joints of color indicated or selected by Sandia
Delegated Representative (SDR).

1.05 [QUALITY ASSURANCE]{.underline}

A. [Fire Performance Characteristics]{.underline}: Where
fire-resistance-rated glass unit masonry is indicated, provide materials
and construction that are identical to those of window assemblies tested
for fire endurance per ASTM E 163 and that are listed for rating
indicated by UL or another testing and inspecting agency acceptable to
authorities having jurisdiction.

B. [Single-Source Responsibility for Glass Block]{.underline}: Obtain
each type and pattern of glass block from a single source with resources
to provide products of consistent quality in appearance and physical
properties without delaying progress of the Work.

C. [Single-Source Responsibility for Accessory Materials]{.underline}:
Obtain mortar ingredients of a uniform quality from one manufacturer for
each cementitious, admixture, and accessory component, and from one
source or producer for each aggregate.

D. All materials used shall not contain asbestos fibers or lead.

1.06 [DELIVERY, STORAGE, AND HANDLING]{.underline}

A. Protect glass block during storage and construction from damage,
soiling, and moisture. Store unopened cartons in a clean, dry area in
which temperatures are controlled to comply with manufacturer\'s
recommendations.

B. Protect aggregate during storage and construction from wetting by
rain, snow, and ground water, and from intermixture with earth or other
materials.

C. Protect cementitious materials and metal accessories from
deterioration and corrosion by moisture and other causes. Store in a dry
location and in original packages.

1.07 [PROJECT CONDITIONS]{.underline}

A. [Weather Conditions]{.underline}: Proceed with installation of glass
unit masonry only when ambient and material temperature are 40 deg.F (4
deg.C) and rising.

PART 2 - PRODUCTS

2.01 [MANUFACTURERS]{.underline}

A. [Manufacturers]{.underline}: Subject to compliance with requirements,
provide products by one of the following:

1\. Hollow Glass Block:

Fidenza Vetraria SpA.

Pittsburgh Corning Corp.

Saint-Gobain

A.J. Weck GmbH u. Co.

Westerwald A. G.

2.02 [GLASS BLOCK]{.underline}

A. [Hollow Glass Block]{.underline}: Non-load-bearing blocks made by
fusing together two halves of clear, colorless pressed glass to produce
partially evacuated hollow units with manufacturer\'s standard coating
factory applied on edge surfaces complying with the following
requirements for pattern, size, and other characteristics:

1\. Translucent Patterns: Smooth outer faces, inner faces with
manufacturer\'s standard translucent light pattern indicated below:

a\. Light-diffusive fluted design, horizontal on one surface, vertical
on other.

2\. Edge Coating Color: Comply with requirements indicated below:

a\. Provide manufacturer\'s standard white-colored, latex-based edge
coating

\(1\) Provide one color throughout for each pattern indicated.

3\. Square Unit Sizes: Actual sizes as indicated in window schedule on
drawings.

2.03 [MORTAR MATERIALS]{.underline}

A. [Portland Cement]{.underline}: ASTM C 150, Type I or Type II, color
as follows:

1\. Cement Color: Gray.

B. [Hydrated Lime]{.underline}: ASTM C 207, Type S.

C. [Aggregate for Mortar]{.underline}: ASTM C 144 and as follows:

1\. For joints 1/4 inch or less in thickness, provide aggregate graded
for thin joints.

D. [Water]{.underline}: Clean and potable.

E. [Water-Repellent Admixture]{.underline}: Manufacturer\'s standard dry
mixture of stearic water-repellent compounds, water reducing agents, and
fine aggregates intended to reduce capillarity in mortar.

1\. Product: Subject to compliance with requirements, provide one of the
following:

\"Hydrocide Powder\", Sonneborne Building Products Division, Chemrex,
Inc.

2.04 [GLASS UNIT MASONRY ACCESSORIES]{.underline}

A. [Panel (Joint) Reinforcement]{.underline}: Ladder-type welded wire
units prefabricated with deformed continuous side rods and plain cross
rods into straight lengths of not less than 10 feet, and complying with
the following requirements:

1\. Hot-Dip Galvanized Steel Wire: ASTM A 82 for uncoated wire and ASTM
A 153, Class B2 for zinc coating applied by hot-dip process to products
after fabrication and assembly.

a\. Application: Use for reinforcement of exterior panels.

2\. Wire Size: 0.1483-inch diameter.

3\. Spacing of Side Rods: 2 inches center to center, unless otherwise
indicated.

4\. Spacing of Cross Rods: Not more than 16 inches apart.

B. [Panel Anchors]{.underline}: Glass unit masonry manufacturer\'s
standard perforated steel strips, 0.0359-inch uncoated thickness by
1-3/4 inches wide by 24 inches long, and hot-dip galvanized after
perforating to comply with ASTM A 153, Class B2.

C. [Asphalt Emulsion]{.underline}: Water-based asphalt emulsion of type
recommended by glass unit masonry manufacturer.

1\. Product: Subject to compliance with requirements, provide Karnak 100
by Karnak Corp.

D. [Plastic Foam Expansion Strips]{.underline}: Polyethylene foam, white
in color, complying with requirements of glass block manufacturer, and
3/8 inch thick by 4 inches wide by 24 inches long.

1\. Use plastic foam expansion strips for non-fire-rated assemblies.

E. [Anchor Bolts]{.underline}: Headed steel bolts complying with ASTM A
307, Grade A and, where indicated, flat washers; hot-dip galvanized to
comply with ATM A 153, Class C; of diameter and length indicated.

F. [Expansion Anchors]{.underline}: Anchor bolt and sleeve assembly of
material indicated below with capability to sustain, without failure, a
load equal to 6 times load imposed when installed in unit masonry and
equal to 4 times load imposed when installed in concrete as determined
by testing per ASTM E 488 conducted by a qualified independent testing
laboratory.

1\. Material: Carbon steel components zinc-plated to comply with ASTM B
633, Class Fe/Zn 5 (5 microns) for Class SC 1 service condition (mild)

2.05 [MORTAR MIXES]{.underline}

A. Do not lower the freezing point of mortar by use of admixtures or
anti-freeze agents. Do not use calcium chloride.

B. [Mortar for Glass Unit Masonry]{.underline}: Comply with ASTM C 270,
proportion specification for Type S portland cement-lime mortar. Do not
use masonry cement.

1\. For mortar in exterior panels, include waterproofing admixture in
mortar mix according to directions of admixture manufacturer.

2\. For pointing mortar in exterior panels, include waterproofing
admixture in mortar mix according to directions of admixture
manufacturer.

C. Mix mortar to produce a stiff but workable consistency that is drier
than mortar for ordinary unit masonry; do not retemper mortar after it
has taken its initial set.

PART 3 - EXECUTION

3.01 [EXAMINATION]{.underline}

A. Examine sills, jambs, and heads surrounding glass unit masonry panels
to verify that they are complete and of correct size and in correct
location to receive glass unit masonry.

B. Do not proceed with installation of glass unit masonry until
conditions are satisfactory.

3.02 [PREPARATION]{.underline}

A. Advise Installer of other construction about specific requirements
relating to placement of dovetail slots and other inserts required to
anchor and support glass unit masonry. Furnish Installers of other
construction with drawings or templates showing locations of these
items.

3.03 [INSTALLATION, GENERAL]{.underline}

A. [Construction Tolerances]{.underline}: Set glass unit masonry to
comply with the following tolerances:

1\. Variation from Plumb: For lines and surfaces of vertical elements
and arises, do not exceed plus or minus 1/4 inch in 10 feet, plus or
minus 3/8 inch in 20 feet, or plus or minimum 1/2 inch maximum.

2\. Variation from Level: For grades indicated for bed joints, and other
conspicuous lines, do not exceed plus or minus 1/4 inch in 10 feet or
plus or minus 1/2 inch maximum.

3\. Variation of Linear Building Line: For positions shown in plan and
related portions of walls and partitions, do not exceed plus or minimum
1/4 inch in 10 feet, plus or minus 3/8 inch in 20 feet, or plus or minus
1/2 inch maximum.

4\. Variation in Alignment: For alignment between tops of walls and
partitions and the bottom of walls and partitions, do not exceed plus or
minus 1/2 inch.

5\. Variation in Mortar Joint Thickness: For bed joints do not exceed
plus or minus 1/8 inch, and for head joints do not exceed minus 1/4 inch
or plus 3/8 inch.

B. [Sill, Head, and Jamb Preparation]{.underline}: Apply a heavy coat of
asphalt emulsion to sill; allow to dry before placing mortar. Place
expansion strips at jambs and heads taking care to extend them to sill.
Trim 4-inch-wide expansion strips to produce width required to fit
thickness of glass block and construction indicated.

3.04 [SETTING GLASS UNIT MASONRY]{.underline}

A. [General]{.underline}: Set first and succeeding courses of glass unit
masonry with completely filled bed and head mortar joints, with no
furrowing.

B. Install glass unit masonry to comply with dimensional tolerances
specified with courses accurately spaced and coordinated with other
construction; maintain the following joint widths.

1\. Joint Widths: 3/8 inch unless otherwise indicated.

C. Install panel reinforcing in horizontal joints at spacing indicated
and to run continuously from end to end of panels; comply with the
following requirements:

1\. Vertical Spacing of Panel Reinforcing: As follows:

a\. For exterior panels, every other course starting with first course
above sill.

2\. Do not bridge expansion joints with panel reinforcing.

3\. Place panel reinforcing in joints immediately above and below all
openings within glass unit masonry panels.

4\. Lap panel reinforcing not less than 6 inches where more than one
length is necessary.

5\. Embed panel reinforcing in mortar bed in 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.

D. Install panel anchors at locations indicated and in same horizontal
joints where panel reinforcing occurs. Extend panel anchors at least 12
inches into joints and bend within expansion joints at edges of panels
and across the head. Attach panel anchors as follows:

1\. For steel members, attach panel anchors with 1/4-inch-diameter steel
bolts in tapped holes in steel members.

E. 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.

F. Keep expansion joints free of mortar.

G. Rake out mortar from joints in exterior panels to a uniform depth
equal to joint width to accommodate pointing material.

H. 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.

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. Remove surplus mortar from face of glass block at time joints are
tooled. Remove mortar while it is still plastic using a clean wet sponge
or an ordinary household scrub brush with stiff bristles. Do not use
harsh cleaners, acids, abrasives, steel wool, or wire brushes when
removing mortar or cleaning glass unit masonry.

K. Install expansion strips at jambs, heads, mullions, and other
locations indicated.

3.05 [CLEANING]{.underline}

A. Perform final mortar removal by cleaning completed glass unit masonry
surfaces with clean wet sponge or cloth. Rinse sponge or cloth
frequently in clean water to remove abrasive particles. Allow any
remaining film on block to dry to a powder.

1\. On surfaces adjacent to glass unit masonry remove mortar and other
residue resulting from installation of glass block in a manner that is
approved by the manufacturers of the materials involved.

2\. Remove excess sealants with commercial solvents of type recommended
by sealant manufacturer. Exercise care not to damage sealant in joints.

3\. Perform final cleaning of glass unit masonry when surface is not
exposed to direct sunlight. Start at top of panel using generous amount
of clean water. Remove water with clean, dry, soft cloths; change cloths
frequently to eliminate dried mortar particles and aggregate.

END OF SECTION