SPECIAL SPECIFICATION

SECTION 09200

[LATH AND PLASTER]{.underline}

Page

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 Metal Supports for Suspended and Furred Ceilings
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2.03 Lath
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2.04 Plaster Accessories for Portland Cement Plaster
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2.05 Portland Cement Plaster Materials
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2.06 Miscellaneous Materials
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2.07 Portland Cement Plaster Mixes and Compositions
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2.08 Mixing
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PART 3 - EXECUTION

3.01 Installation of Lathing and Furring, General
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3.02 Installation of Ceiling Suspension Systems
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3.03 Metal Lathing
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3.04 Installation of Plastering Accessories
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3.05 Plaster Application, General
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3.06 Portland Cement Plaster Application
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3.07 Cutting and Patching
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3.08 Cleaning and Protection
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SPECIAL SPECIFICATION

SECTION 09200

[LATH AND PLASTER]{.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 for Testing and Materials (ASTM)]{.underline}

A525 Specification for General Requirements for Steel Sheet, Zinc-Coated
(Galvanized) by the Hot-Dip Process

A 641 Specification for Zinc-Coated (Galvanized) Carbon Steel Wire

C 150 Specification for Portland Cement

C 206 Specification for Finishing Hydrated Lime

C 207 Specification for Hydrated Lime for Masonry Purposes

C 847 Specification for Metal Lath

C 897 Specification for Aggregate for Job-Mixed Portland Cement-Based
Plasters

C 926 Specification for Application of Portland Cement-Based Plaster

C 932 Specification for Surface-Applied Bonding Agents for Exterior
Plastering

C 1063 Specification for Installation of Lathing and Furring for
Portland Cement-Based Plaster

1.03 [SUMMARY]{.underline}

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

1\. Metal lath and furring.

2\. Portland cement plastering.

B. Load-bearing steel studs and joists are specified in Division 5
Section ÒCold-Formed Metal Framing.Ó

C. Gypsum sheathing for installation behind metal lath is specified in
Division 9 Section ÒGypsum Sheathing.Ó

D. Polymer based protective finish coating is specified in Division 7
Section \"Exterior Finish Systems - Class PB.\"

1.04 [SUBMITTALS]{.underline}

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

B. Product data consisting of manufacturerÕs product specifications and
installation instructions for each product, including data showing
compliance with the requirements.

C. [Material Certificates]{.underline}: Submit producer\'s certificate
for each kind of plaster aggregate indicated evidencing that materials
comply with requirements.

1.05 [QUALITY ASSURANCE]{.underline}

A. [Coordination of Work]{.underline}: Coordinate layout and
installation of suspension system components for suspended ceilings with
other work supported by or penetrating through ceiling.

B. [Field-Construction Mock-Up]{.underline}: Prior to installation of
plaster work, fabricate panels for each type of finish and application
required to verify selections made under sample submittals and to
demonstrate aesthetic effects of application as well as qualities of
materials and erection. Build mock-ups to comply with the following
requirements, using materials indicated for final unit of Work.

1\. Erect 4-foot-by-4-foot-by-full-thickness mock-up in presence of
Sandia Delegated Representative (SDR) using materials, including lath
and support system, indicated for final work.

2\. Demonstrate the proposed range of aesthetic effects including color,
texture, and workmanship to be expected in completed work.

3\. Obtain Sandia Delegated Representative (SDR)Õs acceptance of
mock-ups before start of plaster work.

4\. Retain and maintain mock-ups during construction in undisturbed
condition as a standard for judging completed plaster work.

a\. When directed, demolish and remove mock-ups from Project site.

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

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

A. Deliver materials in original packages, containers, or bundles
bearing brand name and identification of manufacturer.

B. Store materials inside, under cover, and in manner to keep them dry,
protected from weather, direct sunlight, surface contamination, aging,
corrosion, and damage from construction traffic and other causes. Neatly
stack gypsum lath flat to prevent deformation.

C. Handle gypsum lath to prevent damage to edges, ends, or surfaces.
Protect metal corner beads and trim from being bent or damaged.

1.07 [PROJECT CONDITIONS]{.underline}

A. [Environmental Requirements, General]{.underline}: Comply with
requirements of referenced plaster application standards and
recommendations of plaster manufacturer for environmental conditions
before, during, and after application of plaster.

B. [Cold Weather Protection]{.underline}: When ambient outdoor
temperatures are below 40 deg F (4.4 deg C), maintain continuous uniform
temperature of not less than 40 deg F (4.4 deg C) nor more than 80 deg F
(26 deg C) for not less than 1 week prior to beginning plaster
application, during its application, and until plaster is dry but for
not less than one week after application is complete. Distribute heat
evenly; prevent concentrated or uneven heat from contacting plaster near
heat source.

C. [Ventilation]{.underline}: Ventilate building spaces as required to
remove water in excess of that required for hydration of plaster. Begin
ventilation immediately after plaster is applied and continue until it
sets.

D. Protect contiguous work from soiling, spattering, moisture
deterioration and other harmful effects which might result from
plastering.

PART 2 - PRODUCTS

2.01 [MANUFACTURERS]{.underline}

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

1\. Metal Supports:

Allied Structural Industries, Inc.

American Studco, Inc.

Chapman Industries, Inc.

Chicago Metallic Corp.

Dale Industries, Inc.

Dietrich Industries, Inc.

Gold Bond Building Products Div., National Gypsum Co.

Marino Industries

United States Gypsum Co.

2\. Expanded Metal Lath:

Alabama Metal Industries Corp. (AMICO)

Gold Bond Building Products Div., National Gypsum Co.

United States Gypsum Co.

Western Metal Lath Co.

3\. Accessories:

Fry Reglet Corp.

Gold Bond Building Products Div., National Gypsum Co.

Keene Corp.

MM Systems Corp.

Plastic Components, Inc.

United States Gypsum Co.

Western Metal Lath Co.

2.02 [METAL SUPPORTS FOR SUSPENDED AND FURRED CEILINGS]{.underline}

A. [General]{.underline}: Size metal ceiling supports to comply with the
following, unless otherwise indicated.

1\. Portland Cement Plaster Installation: ASTM C 1063.

B. [Wire for Hangers and Ties]{.underline}: ASTM A 641, Class 1 zinc
coating, soft temper.

C. [Rod Hangers]{.underline}: Mild steel, zinc or cadmium coated.

D. [Flat Hangers]{.underline}: Mild steel, zinc or cadmium coated or
protected with rust-inhibitive paint.

E. [Channels]{.underline}: Cold-rolled steel, 0.05980-inch minimum
thickness of base metal (uncoated), allowable bending stress of 18,000
psi, protected with rust-inhibitive paint or galvanizing complying with
ASTM A 525 for G60 coating designation, and as follows:

1\. Carrying Channels: 1-1/2-inch-deep x 7/16-inch-wide flanges, 475
lbs. per 1000 feet painted, 508 lbs. per 1000 feet galvanized.

2\. Furring Channels: 3/4-inch-deep x 7/16-inch-wide flanges, 300 lbs.
per 1000 feet painted, 316 lbs. per 1000 feet galvanized.

3\. Provide galvanized channels for exterior installations.

F. [Hanger Anchorage Devices]{.underline}: Screws, cast-in-place
concrete inserts, or other devices appropriate for anchorage to the form
of structural framing indicated and whose suitability for use intended
has been proven through standard construction practices or certified
test data.

1\. Size devices to develop full strength of hanger but not less than 3
times calculated hanger loading, except size direct pullout concrete
inserts for 5 times calculated hanger loading.

2.03 [LATH]{.underline}

A. [Expanded Metal Lath]{.underline}: Fabricate expanded metal lath from
uncoated or zinc-coated (galvanized) steel sheet to produce lath
complying with ASTM C 847 for type, configuration and other
characteristics indicated below, with uncoated steel sheet painted after
fabrication into lath.

1\. Diamond Mesh Lath: Comply with the following requirements.

a\. Configuration: Self-furring.

\(1\) Weight: 3.4 lbs. per sq. yd.

2\. Rib Lath: Comply with the following requirements for flat soffit
locations:

a\. Configuration: Rib depth of 3/8 inch.

\(1\) Weight: 3.4 lbs. per sq. yd.

2.04 [PLASTER ACCESSORIES FOR PORTLAND CEMENT PLASTER]{.underline}

A. [General]{.underline}: Comply with material provisions of ASTM C
1063; coordinate depth of accessories with thicknesses and number of
coats required.

B. [Metal Corner Reinforcement]{.underline}: Expanded large-mesh diamond
mesh lath fabricated from zinc-alloy or welded wire mesh fabricated from
0.0475-inch-diameter zinc-coated (galvanized) wire and specially formed
to reinforce external corners of portland cement plaster on exterior
exposures while allowing full plaster encasement.

C. [Metal Corner Beads]{.underline}: Small nose corner beads fabricated
from zinc alloy, with expanded flanges of large-mesh diamond lath to
allow full encasement by plaster.

D. [Casing Beads]{.underline}: Square-edged style, with expanded flanges
and removable protective tape, of the following material:

1\. Material: Zinc-coated (galvanized) steel.

E. [Control Joints]{.underline}: Prefabricated, of material and type
indicated below:

1\. Material: Zinc-coated (galvanized) steel.

2\. One-Piece Type: Folded pair of nonperforated screeds in M-shaped
configuration, with expanded flanges.

2.05 [PORTLAND CEMENT PLASTER MATERIALS]{.underline}

A. [Base Coat Cements]{.underline}: Type as indicated below:

1\. Portland cement, ASTM C 150, Type I or II or as required for local
variations.

B. [Factory-Prepared Finish Coat]{.underline}: Refer to Division 7
Section \"Exterior Finish Systems - Class PB.\"

C. [Lime]{.underline}: Special hydrated lime for finishing purposes,
ASTM C 206, Type S, or special hydrated lime for masonry purposes, ASTM
C 207, Type S.

D. [Sand Aggregate for Base Coats]{.underline}: ASTM C 897.

F. [Fiber for Base Coat]{.underline}: Alkaline-resistant (AR) glass or
polypropylene fibers, 1/2 inch long, free of contaminates, manufactured
for use in portland cement plaster.

2.06 [MISCELLANEOUS MATERIALS]{.underline}

A. [Water for Mixing and Finishing Plaster]{.underline}: Drinkable and
free of substances capable of affecting plaster set or of damaging
plaster, lath, or accessories.

B. [Bonding Agent for Portland Cement Plaster]{.underline}: ASTM C 932.

2.07 [PORTLAND CEMENT PLASTER MIXES AND COMPOSITIONS]{.underline}

A. [General]{.underline}: Comply with ASTM C 926 for portland cement
plaster base and finish coat mixes as applicable to plaster bases,
materials, and other requirements indicated.

B. [Portland Cement Plaster Base Coat Mixes and
Compositions]{.underline}: Proportion materials for respective base
coats in parts by volume for cementitious materials and in parts by
volume per sum of cementitious materials for aggregates to comply with
the following requirements for each method of application and plaster
base indicated. Adjust mix proportions below within limits specified to
attain workability.

1\. Fiber Content: Add fiber to following mixes after ingredients have
mixed at least 2 minutes. Comply with fiber manufacturerÕs directions
but do not exceed 2 lbs. per cu. ft. of cementitious materials. Reduce
aggregate quantities accordingly to maintain workability.

2\. Two-Coat Work Over Metal Lath: Base coats as indicated below:

a\. Scratch and Brown Coats: Mix portland cement, lime, and sand to
conform to ASTM C 926 and as required for local variations.

2.08 [MIXING]{.underline}

A. Mechanically mix cementitious and aggregate materials for plasters to
comply with applicable referenced application standard and with
recommendations of plaster manufacturer.

PART 3 - EXECUTION

3.01 [INSTALLATION OF LATHING AND FURRING, GENERAL]{.underline}

A. [Portland Cement Plaster Lathing and Furring Installation
Standard]{.underline}: Install lathing and furring materials indicated
for portland cement plaster to comply with ASTM C 1063.

B. Install supplementary framing, blocking, and bracing at terminations
in the work and for support of fixtures, and similar work to comply with
details indicated or, if not otherwise indicated, to comply with
applicable published recommendations of gypsum plaster manufacturer, or
if not available, of \"Gypsum Construction Handbook\" published by
United States Gypsum Co.

C. [Isolation]{.underline}: Where lathing and metal support system abuts
building structure horizontally and where partition/wall work abuts
overhead structure, isolate the work from structural movement
sufficiently to prevent transfer of loading into the work from the
building structure. Install slip- or cushion-type joints to absorb
deflections but maintain lateral support.

1\. Frame both sides of control and expansion joints independently, and
do not bridge joints with furring and lathing or accessories.

3.02 [INSTALLATION OF CEILING SUSPENSION SYSTEMS]{.underline}

A. [Preparation and Coordination]{.underline}: Coordinate installation
of ceiling suspension system with installation of overhead structural
systems to ensure that inserts and other structural anchorage provisions
have been installed to receive ceiling hangers in a manner that will
develop their full strength and at spacings required to support ceiling.

B. [Hanger Installation]{.underline}: Attach hangers to structure above
ceiling to comply with ML/SFA \"Specifications for Metal Lathing and
Furring\" and with referenced standards.

1\. Do not attach hangers to metal deck tabs.

C. Install ceiling suspension system components of sizes and spacings
indicated but not in smaller sizes or greater spacings than those
required by referenced lathing and furring installation standards.

1\. Wire Hangers: Space 8-gage (0.16-inch-diameter) wire hangers not
over 4\'-0\" o.c. parallel with and not over 3\'-0\" perpendicular to
direction of carrying channels, unless otherwise indicated, and within 6
inches of carrying channel ends.

2\. Carrying Channels: Space carrying channels not over 3\'-0\" o.c.
with 4\'-0\" o.c. hanger spacing.

3\. Furring Channels to Receive Metal Lath: Space furring channels not
over 16 inches o.c. for 3.4-lb. diamond mesh lath, or 24\" o.c. for
3.4-lb, 3/8 inch rib lath.

3.03 [METAL LATHING]{.underline}

A. Install expanded metal lath for the following applications where
plaster base coats are required. Provide appropriate type, configuration
and weight of metal lath selected from materials indicated which comply
with referenced lathing installation standards.

1\. Suspended and furred ceilings using 3.4 lbs. per sq. yd. minimum
weight rib mesh lath.

2\. Exterior sheathed wall surfaces using 3.4 lbs per sq. yd. minimum
weight self-furring diamond mesh lath.

3.04 [INSTALLATION OF PLASTERING ACCESSORIES]{.underline}

A. [General]{.underline}: Comply with referenced lathing and furring
installation standards for provision and location of plaster accessories
of type indicated. Miter or cope accessories at corners; install with
tight joints and in alignment. Attach accessories securely to plaster
bases to hold accessories in place and alignment during plastering.

B. [Accessories for Portland Cement Plaster]{.underline}: Provide the
following types to comply with requirements indicated for location:

1\. Corner Bead: Install at external corners.

2\. Casing Beads: Install at terminations of plaster work unless
otherwise indicated.

3\. Control Joints: Install control joints at locations indicated or, if
not indicated, at locations complying with the following criteria and
approved by Sandia Delegated Representative (SDR).

a\. Where an expansion or control joint occurs in surface of
construction directly behind plaster membrane.

b\. Where plaster panel sizes or dimensions change, extend joints full
width or height behind plaster membrane.

3.05 [PLASTER APPLICATION, GENERAL]{.underline}

A. Prepare monolithic surfaces for bonded base coats and use bonding
compound or agent to comply with requirements of referenced plaster
application standards for conditioning of monolithic surfaces.

B. [Tolerances]{.underline}: Do not deviate more than 1/8 inch in
10\'-0\" from a true plane in finished plaster surfaces, as measured by
a 10\'-0\" straightedge placed at any location on surface.

C. Grout hollow metal frames, bases, and similar work occurring in
gypsum plastered areas, with base coat plaster material, and prior to
lathing where necessary. Except where full grouting is indicated or
required for fire-resistance rating, grout at least 6 inches at each
jamb anchor clip.

D. Sequence plaster application with the installation and protection of
other work, so that neither will be damaged by the installation of the
other.

E. Plaster flush with metal frames and other built-in metal items or
accessories that act as a plaster ground, unless otherwise indicated.
Where plaster is not terminated at metal by casing beads, cut base coat
free from metal before plaster sets and groove finish coat at the
junctures with metal.

F. Apply thicknesses and number of coats of plaster as indicated or as
required by referenced standards.

3.06 [PORTLAND CEMENT PLASTER APPLICATION]{.underline}

A. [Portland Cement Plaster Application Standard]{.underline}: Apply
portland cement plaster materials, compositions, and mixes to comply
with ASTM C 926.

B. [Number of Coats]{.underline}: Apply portland cement plaster, of
composition indicated, to comply with the following requirements:

1\. Use two-coat work over the following plaster bases and in
thicknesses indicated:

a\. Metal lath.

b\. Scratch and Brown Coats: Apply each in 3/8 inch thickness (minimum).

C. Moist-cure portland cement plaster base coats to comply with ASTM C
926, including recommendations for time between coats and curing in
\"Annex A2 Design Considerations\".

3.07 [CUTTING AND PATCHING]{.underline}

A. Cut, patch, point-up, and repair plaster as necessary to accommodate
other work and to restore cracks, dents, and imperfections. Repair or
replace work to eliminate blisters, buckles, excessive crazing and check
cracking, dry outs, efflorescence, sweat outs and similar defects and
where bond to the substrate has failed.

3.08 [CLEANING AND PROTECTION]{.underline}

A. Remove temporary protection and enclosure of other work. Promptly
remove plaster from door frames, windows, and other surfaces that are
not to be plastered. Repair floors, walls, and other surfaces that have
been stained, marred, or otherwise damaged during the plastering work.
When plastering work is completed, remove unused materials, containers,
and equipment and clean floors of plaster debris.

B. Provide final protection and maintain conditions, in a manner
suitable to Installer that ensures plaster workÕs being without damage
or deterioration at time of Substantial Completion.

END OF SECTION