Specifications.pdf

INVITATION FOR BID

REPAIR GREENHOUSE #401 STUB WALL

CEREAL DISEASE LABORATORY

USDA-ARS

ST. PAUL, MINNESOTA

JULY 20, 2009

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Repair Greenhouse #401 Stub Wall

Cereal Disease Laboratory

St. Paul, MN

Table of Contents

Statement of Work Section 09220 – Portland Cement Plaster Existing Floor Plan (from drawings dated 4/25/97) Existing Evaporative Cooler Cross Section (from drawings dated 6/1/91) Photographs of Existing Installation

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Cereal Disease Laboratory

St. Paul, MN

Statement of Work:

1. The project, generally, consists of the repairing and restoring existing greenhouse stub walls that are deteriorated and damaged from the freezing and thawing of moisture retained in the concrete masonry unit walls.

2. Project Location: USDA - Cereal Disease Laboratory (CDL), 1551 North Lindig

Avenue, St. Paul, MN.

3. Point of Contact at Location: Pam Groth, Administrative Officer, 651-649-5046.

4. The Contractor shall furnish all labor, materials, equipment, supplies, transportation, utilities, supervision and incidentals for all elements of the work in accordance with this Statement of Work and attached specifications to provide an installation that is complete in every respect, properly operating and ready for use.

5. Contractor shall coordinate all work activities with the Owner prior to beginning any work. All work shall be scheduled in a manner such that on-going research is not jeopardized.

6. Period of performance shall be 90 days from issuance of notice to proceed. Due to anticipated disturbances of the greenhouse heating system; Contractor’s bid shall reflect that Notice to Proceed for the project is anticipated to be issued in late April – early May of 2010.

7. Existing installations:

Contractor shall field verify all existing conditions affecting the intended installation.

Greenhouse #401 consists of an approximate 36’ x 120’ greenhouse with an approximate 11’-4” x 18’ alley house. The glazing system and associated framework of the greenhouse and alley house is supported from a concrete masonry unit wall.

Elevations of the stub walls are as follows: Greenhouse North Wall - approximately 4’-0” above finished grade; Greenhouse South, East and West Walls – approximately 2’-2” above finished grade; Alley House North Wall – approximately 4’-0” above finished grade; Alley House South Wall – approximately 2’-2” above finished grade.

The following is noted regarding the existing installations:

a. An existing electrical enclosure is located in near the northwest corner of the

Greenhouse #401.

b. The greenhouse is served by a cooling system with evaporative cooling pads, associated water recycle trough with associated piping and drains along south exterior wall.

c. The greenhouse is served by a heating system with fin tube radiation units along north, east, west and south exterior walls. See attached “Evaporative Cooler Cross Section” from drawings of 1991 installation for additional information.

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See the attached floor plan for the general configuration of the Greenhouse #401 (i.e. greenhouse and alley house).

Photographs of the existing installation are attached for Contractor’s use. Contractor shall confirm all information indicated in the photographs.

8. General Demolition Notes:

An attempt has been made to identify in this Statement of Work the existing installations that need to be disconnected and restored to accomplish the intent of this project. Contractor shall field verify.

Contractor shall modify existing installations as needed to accommodate the new installation. Contractor shall disconnect and restore existing installations as needed to accommodate the new installation.

All disturbances of existing systems shall be thoroughly coordinated with the Owner to prevent disconnecting equipment that might jeopardize on-going research.

9. Scope of Work:

a. Exterior: Disconnect and remove existing cooling system evaporative pads and water recycle trough system installed along south wall prior to repair stub wall.

Replace existing water recycle trough with new. Match existing materials and configuration. Store for re-installation. After wall repairs have been completed; re-install evaporative pads and new water trough system. Reconnect all piping systems to restore the cooling system and verify proper system operation.

b. Exterior: Disconnect and remove existing electrical enclosure near northwest corner of greenhouse as needed for the wall preparation work and installation of exterior plasterwork.

c. Exterior: Remove existing paint, coatings, mildew, etc in their entirety from exterior surface of all concrete unit masonry walls of Greenhouse #401 (greenhouse and alley house) using abrasive removal. Provide clean, bare concrete masonry unit wall free of loose particles. Contractor shall furnish and install all materials to protect adjacent glazing installations and structures from damage. Contractor shall be responsible for repairing and replacing all damages surfaces.

d. Exterior: Drill and grout all existing block cells with grout. Where broken masonry units exist; provide forms and finishing such that suitable level surface for the proper metal lath installation is provided.

e. Exterior: Furnish and install self-furring metal lath, 7/8” casing beads, expansion joints, control joints and accessories for new exterior plasterwork. Self-furring metal lath, casing beads, control joints, expansion joints and accessories shall be in accordance with attached Specification Section 09220. Self-furring lath shall be attached to the stub walls with concrete stub nails in areas where concrete masonry units are in good condition and with self tapping concrete screws in areas where concrete masonry units are deteriorated. Fasteners shall be provided on a spacing not to exceed 6” vertically and 12” horizontally. Casing beads shall be provided at the top, at base, at doorways and as indicated in the attached Specification Section 09220. Base bead shall be set at nominal 3” above finished grade. Top bead shall be set as close as possible to existing glazing framework and shall be coordinated with the flashing installation. See item g. below.

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f. Exterior: Furnish and install new three coat (scratch, base and finish) Portland cement plaster coating on all concrete masonry unit walls of Greenhouse #401 (greenhouse and alley house). The plasterwork shall have a white sand float finish. The exterior plasterwork shall be in accordance with the attached Specification Section 09220.

g. Exterior: Furnish and install flashing along intersection of top level of plaster work and existing greenhouse glazing frame work to prevent water from accumulating behind new plaster installation. Contractor shall confirm existing conditions and submit detail of proposed flashing detail in project’s shop drawings.

h. Interior: Disconnect and remove interior fin tube radiation units and associated piping systems to gain proper access for the specified interior surface improvements. After interior surface work is completed; clean and re-install interior fin tube radiation units and associated piping systems. Reconnect all piping to restore the heating system and verify proper operation. Re-insulate piping to restore original installation.

i. Interior: Remove existing paint, coatings, mildew, etc in their entirety from interior side of all exterior concrete unit masonry walls of Greenhouse #401 (greenhouse and alley house) using abrasive removal. Provide clean, bare concrete masonry unit wall free of loose particles. On interior side of exterior wall: tuck point masonry unit joints, fill all cracks / voids and prepare surface for new paint coating in accordance with manufacturer’s written recommendations. Filler for cracks / voids shall be compatible with new painting coating and exhibit similar performance.

j. Interior: Furnish and install new primer and paint on interior side of all exterior walls of Greenhouse #401 (greenhouse and alley house). Provide one coat of primer and two coats of paint. Paint and primer products shall be a non-toxic fully tintable inorganic mineral silicate product that will not support algae, fungi or mold growth and that has a high breathability rate allowing moisture to escape;

Green Building Supply “Silacote” series or approved equal. Submit product data on proposed paint and associated primer and filler products in project’s shop drawings. Color shall be selected by Owner from manufacturer’s standard color matrix.

10. Submittals:

Where “Approved Equal” is indicated in the specification of equipment, material or installation; the Owner shall approve all alternate equipment, materials, manufacturers or installation. It shall be the Contractor’s burden to furnish all documentation and / or samples to show equality with specified items. Owner’s decision is final.

Submit manufacturer’s product literature and shop drawings on equipment and material proposed for the project to USDA-MWA Area Office Engineer prior to releasing equipment and materials for manufacture / fabrication. The review by USDA shall be for general compliance with design concept. Markings for comments and approval of the submittals by USDA shall not be construed as releasing the Contractor from compliance with the specified requirements. USDA shall retain three

(3) copies of the reviewed submittals. Contractor shall furnish additional copies as needed for the Contractor’s use.

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11. General:

In executing the greenhouse interior work; the Contractor shall coordinate access greenhouse spaces with Owner. Contractor’s bid shall reflect that interior work shall be completed in three phases (Compartment #1, Compartment #2); (Compartment #3, Compartment #4); (Compartment #5, Walk Corridor, Alley House). See attached floor plan. Contractor shall notify Owner when the Work is completed in one phase and they are ready to move into new phase. Bid shall reflect that Owner will need two (2) working days clear next phase of equipment / materials.

12. General:

Prior to submitting bid, Contractor shall verify all parking requirements and fees with the University of Minnesota. Coordinate with Parking Services Department; 300 Transportation and Safety Building; 511 Washington Avenue SE, Minneapolis, MN 55414; Phone: 612-626-7275. Contractor shall verify all parking fees, required permits, maximum number of construction vehicles allowed for the project, parking locations, etc. Contractor’s bid shall reflect compliance with parking requirements and restrictions of University of Minnesota and shall include all parking fees.

CDL, St. Paul, MN

DIVISION 9 - FINISHES

SECTION 09220

PORTLAND CEMENT PLASTER 09220 - 1

SECTION 09220 - PORTLAND CEMENT PLASTER

PART 1 - GENERAL

1.1 SUMMARY

A. This Section includes the following:

1. Exterior portland cement plasterwork on metal lath plaster bases.

1.2 SUBMITTALS

A. Product Data: For each type of product indicated.

B. Samples for Verification: For each type of [factory-prepared] [colored] [textured] finish coat indicated;

12 by 12 inches (305 by 305 mm), and prepared on rigid backing.

1.3 QUALITY ASSURANCE

A. Mockups: Before plastering, install mockups of at least 100 sq. ft. (9 sq. m) in surface area to demonstrate aesthetic effects and set quality standards for materials and execution.

1. Install mockups for each type of finish indicated.

2. Approved mockups may become part of the completed Work if undisturbed at time of Substantial

Completion.

1.4 DELIVERY, STORAGE, AND HANDLING

A. Store materials inside under cover and keep them dry and protected against damage from weather, direct sunlight, surface contamination, corrosion, construction traffic, and other causes.

1.5 PROJECT CONDITIONS

A. Comply with ASTM C 926 requirements.

B. Exterior Plasterwork:

1. Apply and cure plaster to prevent plaster drying out during curing period. Use procedures required by climatic conditions, including moist curing, providing coverings, and providing barriers to deflect sunlight and wind.

2. Apply plaster when ambient temperature is greater than 40 deg F (4.4 deg C).

C. Protect plaster coats from freezing for not less than 48 hours after set of plaster coat has occurred.

PORTLAND CEMENT PLASTER 09220 - 2

PART 2 - PRODUCTS

2.1 METAL LATH

A. Expanded-Metal Lath: ASTM C 847 with ASTM A 653/A 653M, G60 (Z180), hot-dip galvanized zinc coating.

1. Diamond-Mesh Lath: Self-furring.

2. Weight: 3.4 lb/sq. yd.

2.2 ACCESSORIES

A. General: Comply with ASTM C 1063 and coordinate depth of trim and accessories with thicknesses and number of plaster coats required.

B. Zinc Accessories:

1. Cornerite: Fabricated from metal lath with ASTM A 653/A 653M, G60 (Z180), hot-dip galvanized zinc coating.

a. External-Corner Reinforcement: Fabricated from metal lath with ASTM A 653/A 653M, G60 (Z180), hot-dip galvanized zinc coating.

2. Casing Beads: Fabricated from zinc; square-edged style; with expanded flanges.

3. Control Joints: Fabricated from zinc; one-piece-type, folded pair of unperforated screeds in M-shaped configuration; with perforated flanges and removable protective tape on plaster face of control joint.

2.3 MISCELLANEOUS MATERIALS

A. Water for Mixing: Potable and free of substances capable of affecting plaster set or of damaging plaster, lath, or accessories.

B. Fiber for Base Coat: Alkaline-resistant glass or polypropylene fibers, 1/2 inch (13 mm) long, free of contaminants, manufactured for use in portland cement plaster.

C. Bonding Compound: ASTM C 932.

D. Fasteners for Attaching Metal Lath to Substrates: Complying with ASTM C 1063.

2.4 PLASTER MATERIALS

A. Portland Cement: ASTM C 150, Type [I] [II].

1. Color for Finish Coats: White.

B. Lime: ASTM C 206, Type S; or ASTM C 207, Type S.

C. Sand Aggregate: ASTM C 897.

PORTLAND CEMENT PLASTER 09220 - 3

2.5 PLASTER MIXES

A. General: Comply with ASTM C 926 for applications indicated.

1. Fiber Content: Add fiber to base-coat mixes after ingredients have mixed at least two minutes.

Comply with fiber manufacturer's written instructions for fiber quantities in mixes, but do not exceed 1 lb of fiber/cu. yd. (0.6 kg of fiber/cu. m) of cementitious materials. Reduce aggregate quantities accordingly to maintain workability.

B. Base-Coat Mixes for Use over Metal Lath on Concrete Unit Masonry: Scratch and brown coats for three-coat plasterwork as follows:

1. Portland Cement Mixes:

a. Scratch Coat: For cementitious material, mix 1 part portland cement and 0 to 3/4 parts lime. Use 2-1/2 to 4 parts aggregate per part of cementitious material (sum of separate volumes of each component material).

b. Brown Coat: For cementitious material, mix 1 part portland cement and 3/4 to 1-1/2 parts lime. Use 3 to 5 parts aggregate per part of cementitious material (sum of separate volumes of each component material).

C. Job-Mixed Finish-Coat Mixes:

1. Portland Cement Mix: For cementitious materials, mix 1 part portland cement and 1-1/2 to 2 parts lime. Use 1-1/2 to 3 parts aggregate per part of cementitious material (sum of separate volumes of each component material).

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine areas and substrates, with Installer present, and including welded hollow-metal frames, cast-in anchors, and structural framing, for compliance with requirements and other conditions affecting performance.

1. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 PREPARATION

A. Protect adjacent work from soiling, spattering, moisture deterioration, and other harmful effects caused by plastering.

B. Prepare solid-plaster bases that are smooth or that do not have the suction capability required to bond with plaster according to ASTM C 926.

3.3 INSTALLING METAL LATH

A. Expanded-Metal Lath: Install according to ASTM C 1063.

1. On Solid Surfaces, Not Otherwise Furred: Install self-furring diamond-mesh lath.

PORTLAND CEMENT PLASTER 09220 - 4

3.4 INSTALLING ACCESSORIES

A. Install according to ASTM C 1063 and at locations indicated on Drawings.

B. Reinforcement for External Corners:

1. Install lath-type external-corner reinforcement at exterior locations.

C. Control Joints: Install control joints in specific locations approved by Owner for visual effect as follows:

1. At distances between control joints of not greater than 12 feet (5.5 m) o.c.

2. Where plasterwork areas change dimensions, to delineate rectangular-shaped areas (panels) and to relieve the stress that occurs at the corner formed by the dimension change.

3.5 PLASTER APPLICATION

A. General: Comply with ASTM C 926.

1. Do not deviate more than plus or minus 1/4 inch in 10 feet (6.4 mm in 3 m) from a true plane in finished plaster surfaces, as measured by a 10-foot (3-m) straightedge placed on surface.

2. Grout hollow-metal frames, bases, and similar work occurring in plastered areas, with base-coat plaster material, before lathing where necessary. Except where full grouting is indicated or required for fire-resistance rating, grout at least 6 inches (152 mm) at each jamb anchor.

3. Finish plaster flush with metal frames and other built-in metal items or accessories that act as a plaster ground, unless otherwise indicated. Where casing bead does not terminate plaster at metal frame, cut base coat free from metal frame before plaster sets and groove finish coat at junctures with metal.

4. Provide plaster surfaces that are ready to receive field-applied finishes indicated.

B. Bonding Compound: Apply on unit masonry plaster bases.

C. Plaster Finish Coats: Apply to provide float finish to match Owner's sample.

3.6 CUTTING AND PATCHING

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

3.7 CLEANING AND PROTECTION

A. Remove temporary protection and enclosure of other work. Promptly remove plaster from doorframes, windows, and other surfaces not indicated to be plastered. Repair floors, walls, and other surfaces stained, marred, or otherwise damaged during plastering.

END OF SECTION 09220