GOB_Specs_Attachment_2.pdf

GENEVA OFFICE BUILDING EXTERIOR IMPROVEMENTS

04 01 00 - 1 Masonry Cleaning

SECTION 04 01 00

MASONRY CLEANING

PART 1 - GENERAL

1.01 SUMMARY

A. Section Includes:

1. Clean exterior brick masonry using the gentlest means possible.

1.02 QUALITY ASSURANCE

A. Subcontractor Qualifications: All work shall be performed by skilled Subcontractors having not less than five (5) years satisfactory experience in comparable masonry cleaning including work on at least two (2) projects similar in scope and scale to this Project. Submit references with name of contact person and telephone number for the two (2) submitted similar projects.

1. Only skilled workers who are familiar and experienced with the materials and methods specified shall be used for masonry cleaning work.

2. One skilled journeyman shall be present at all times during execution of the work and shall personally direct the masonry cleaning.

3. In acceptance or rejection of masonry cleaning, no allowance will be made for lack of skill on the part of the workers.

4. Within five (5) business days after bid opening submit qualifications and experience of all lead personnel scheduled for work on this Project. List project manager or foreman's name and experience relative to this Project. All work shall be performed by persons whose qualifications have been submitted.

B. Standard of Cleanliness: Cleaned surfaces shall be subject to the approval of the Architect.

C. Statement of Application: By undertaking the work of this section, assume overall responsibility and warrant the following:

1. All components are compatible with each other and with conditions of expected use.

2. All materials and application methods are compatible with existing adjacent materials and with adjacent work of other trades.

3. There will be no material failure, discoloration, or disfigurement from cleaning agents or processes used in the work of this section.

1.03 SUBMITTALS

A. Submit under provisions of Division 1 requirements.

B. Product Data:

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1. Materials list of items proposed to be provided under this Section.

2. Manufacturer's specifications and other data needed to prove compliance with the specified requirements.

3. Chemical content of each product and history of product use. Identify any limitations of products or product use. Include any potential damage to other materials, potential health or safety hazards and potential environmental damage.

4. Manufacturer's recommended procedures which, when approved, will become the basis for accepting or rejecting actual procedures used on the work.

C. Schedule and Procedures: Submit the following written schedules and procedures for proposed cleaning operations for each type of masonry and project condition:

1. Verify methods and materials proposed for cleaning operations per drawings and these specifications.

2. Verify proposed locations of all field tests with Planning Preservation Staff and Owner.

3. Identify methods and materials proposed for the proper protection of areas adjacent to chemical cleaning, including windows, landscaping, pedestrian and vehicle areas, and other non-masonry surfaces. (See Protection Specification B Section 02 07 10 Protection & Salvage of Historic Materials & Assemblies)

4. Submit data regarding equipment to be used.

5. Detail sequence of operations and schedule of work.

1.04 FIELD SAMPLES

A. Cleaning: Prepare sample panels using various methods and products as described below, to determine most effective and gentlest method for removal of paint from brick surfaces.

Additional products and treatments for testing may be identified during the testing process.

B. Field sample panels shall be defined by, and span between natural architectural lines and be of an appropriate size (no greater than 5'-0" x 5'-0") to demonstrate relevant cleaning methods.

Natural architectural lines include mortar joints, scored reveals, wall or engaged column intersections, or window openings. Sample panel locations are shown on the drawings. Samples shall establish dilution rates, dwell times, number of applications, compatibility, effectiveness, application procedures and desired results.

C. The location of the sample panels will be subject to approval by Planning Preservation Staff.

D. Planning Preservation Staff shall be present during preparation of field sample panels.

E. Allow 48 hours, or until test panels are thoroughly dry, before evaluating final appearance and results.

F. Upon approval by the Planning Preservation Staff, all sample panels will be the standard for judging the workmanship for the balance of cleaning operations.

G. Retain sample panels in undisturbed condition during construction.

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H. The following methods and materials shall be field tested. Follow manufacturers instructions for application, dwell time, and surface neutralizing if required. Follow-up testing may be required to determine optimum dwell time.

1. Low pressure water, with light scrubbing with bristle brush.

2. Solution of Simple Green and water, light scrubbing with bristle brush and low-pressure rinse.

3. Solution of TSP and water, light scrubbing with bristle brush and low-pressure rinse.

4. Prosoco 2010

5. Prosoco EK Restoration Cleaner

6. Other masonry cleaning products as needed (i.e. Prosoco light duty restoration cleaner) until acceptable level of clean is achieved.

I. Begin testing with the gentlest means possible. For chemical cleaners, begin with maximum dilutions and minimum dwell times. The gentlest effective procedure will become the standard for the remaining areas to be treated.

1. For testing of low-pressure cleaning, test to adequately demonstrate and assess the variables associated with the masonry units, the level of soiling, and the equipment. The following variables shall be tested:

a. Nozzle type and size

b. Working pressure

c. Working distance to masonry to be cleaned

d. Effectiveness of protection measures

e. Reclamation, disposal and clean-up of spent cleaning media.

1.05 PRODUCT DELIVERY, STORAGE, AND HANDLING

A. Deliver materials to the site in manufacturer's original and unopened containers and packaging, bearing labels as to type and names of products and manufacturers. Delivered materials must be identical to approved samples.

B. Storage and Handling: Store containers upright in a cool, dry, well-ventilated place, out of the sun. Store away from all other chemicals and potential sources of contamination. Keep lights, fire, sparks and heat away from containers. Keep containers tightly closed when not in use.

Store and handle in accordance with manufacturer's instructions.

1.06 SITE CONDITIONS

A. Clean masonry only when air temperatures are between 40 degrees F and 90 degrees F, or as recommended by the product manufacturer, and will remain so until stone has dried out, but for no less than seven (7) days after completion of cleaning.

B. Disposal: Dispose of all waste materials in a safe and legal manner.

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C. Regulations: Conform to all applicable federal, state, and local environmental regulations.

regarding testing, handling, treatment, containment, collection, transport, disposal and discharge of hazardous wastes and cleaning effluents.

1.07 PROTECTION

A. Take precautions to avoid harm to pedestrians, nearby property, and all non-masonry surfaces that may come in contact with paste, rinse residue and fumes. During use, avoid wind drift that may injure passers-by, damage vehicles or adjacent properties. Protect and/or divert pedestrian and auto traffic.

B. Protect all foliage and surrounding surfaces not designated for paint removal from contact with the paste, rinse residue and fumes to avoid damage.

PART 2 - PRODUCTS

2.01 MASONRY CLEANING MATERIALS

A. The following products are acceptable based upon a history of prior use but are subject to confirmation and testing for use on the conditions of this project.

1. Chemical cleaners and masking for use on sandstone produced by Prosoco, Inc., Kansas

City, Kansas, 66104, or an approved equal:

a. 2010 All Surface Cleaner

b. EK Restoration Cleaner.

c. Light Duty Restoration Cleaner

2. Product dilution and application shall be determined based upon the recommendations of the manufacturer's technical representative and actual testing in the presence of the Architect.

B. Cleaning materials shall not contain chemicals that may attach or leave deposits on the masonry. Cleaning agents, equipment, and methods employed shall in no way damage the masonry or other adjoining materials.

1. Modify the process or processes to suit the finish, hardness, and condition of the surface to be cleaned.

2. Cleaning solvents shall be non-injurious to the surfaces upon which they are applied. The methods used shall cause no pitting, erosion, or damage to the surfaces.

C. Water

1. Use only clean, potable water for all cleaning operations.

2. From the water sources available provide all required hoses, valve connections, pumps, nozzles, and all other necessary water conveying components to provide water where needed.

3. Take special care to not cause water damage within the building.

D. Brushes: Fiber bristle only.

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E. Spray Equipment: Provide equipment for controlled spray application of water at pressure rates established during field testing.

1. For spray application of chemical cleaners (if required) provide low-pressure tank or chemical pump suitable for chemical cleaner indicated, equipped with fan shaped spray-tip.

2. For spray application of water provide fan-shaped spray-tip which disperses water at angle of not less than 15 degrees.

PART 3 - EXECUTION

3.01 GENERAL

A. The purpose of the cleaning process is to remove oil, grease, dirt, biological growth and chemical contamination without damage to, or disintegration of, the masonry surface.

B. The level of cleaning shall be as approved in the mock-ups as specified herein.

C. Contractor shall use the gentlest effective means of cleaning and stain removal, so as not to damage the stone or the environs.

D. At all times, protect all surrounding building materials, landscape features, and building occupants and visitors from cleaning operations, runoff, and any fumes that may be generated.

E. It is recognized that variations of the cleaning materials and their application may be required as the job proceeds. However, no variation will be acceptable without written approval from the Architect.

F. Water Collection

1. Do not allow water to run off into the storm drain system.

2. Collect all water and other liquids from cleaning activities and dispose of per the California

Regional Water Quality Control Board and the California State Water Resources Control Board.

3.02 GENERAL CLEANING

A. Clean from top to bottom.

B. Pre-wet using very low pressure (<100 psi.).

C. Install soaker hose below areas being cleaned to prevent streaking from the runoff cleaning solution. Keep soaker hose on below all areas being cleaned.

D. Bucket and brush cleaning. Starting at the top of the wall, apply water and detergent solution from the bucket and scrub with a long-handled, natural bristle brush. Do not allow surfaces to dry.

E. Thoroughly rinse with sufficient water and very low pressure (<100 psi.) from the top of wall.

F. Pressure washing or cleaning agents shall not be used unless approved by the Architect in advance. Remove stubborn stains, stubborn efflorescence, oil, or foreign substances with cleaning agents only upon advance approval of the Architect.

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3.03 REMOVAL OF BIOLOGICAL GROWTH

A. Verify that all areas of biological growth have been identified.

B. Apply according to manufacturer's instructions, and based upon results of testing.

C. Scrub thoroughly with a non-metallic, short-fibered scrub brush. Allow the undiluted product to remain on the surface for 1 to 2 minutes, then apply additional product to maintain a wet surface.

D. Lightly mist with water and continue scrubbing.

E. Rinse thoroughly with clean water at very low pressure (<100 psi).

F. Repeat application as necessary to remove biological growth.

3.04 REMOVAL OF HEAVY STAINING

A. Remove paint, coatings, and any other foreign material, in a manner that does not damage the masonry. The following are not allowed:

1. Abrasive cleaning of any sort.

2. Mechanical means.

3. Caustic paint removals or strippers, unless specifically tested and approved for use.

B. Apply approved chemical cleaner according to manufacturer's instructions, and based upon results of testing.

C. Rinsing

1. Use low pressure water rinse (<100 psi) to remove residual dirt and cleaning chemical.

2. Rinse from upper portions of wall downward.

3. Continually rise surface below area being cleaned, using soaker hose to prevent streaking.

4. Water run-off shall be collected, in a manner approved by the Owner, at the base of each wall, and disposed of per the Stormwater Pollution Control Program. Water shall not be permitted to collect or pond on any surfaces.

D. Repeat application and rinsing as necessary until surface matches approved mock-up.

3.05 CLEAN-UP

A. Rinse surfaces thoroughly of all chemicals, dirt, pollutants, and other materials washed off the building each day.

B. After cleaning has been completed, remove all protection including all tape, polyvinyl sheets, strippable mask, tec. Clean all glass. Replace glass or metal damaged or etched during the cleaning process at no cost to the Owner.

END OF SECTION

04 05 21 - 1 Historic Masonry Repair

SECTION 04 05 21

HISTORIC MASONRY REPAIR

PART 1 - GENERAL

1.01 SECTION INCLUDES

A. Selective replacement of existing brick.

B. Selective patching of existing brick

C. Selective pointing/repointing of masonry.

D. Selective removal of paint and biological growth from existing brick.

1.02 QUALITY ASSURANCE

A. Qualifications of Masonry Contractor

1. The Contractor for work of this section shall have a minimum of ten (10) years experience in masonry restoration involving cleaning, resetting, and repointing.

2. All work shall be performed by skilled personnel with not less than five (5) years documented experience in masonry restoration and procedures as specified above.

Submit qualifications for each mechanic scheduled to work on this project. All work to be performed by person(s) whose qualifications have been submitted.

1.03 UNIT PRICES

A. Work of this Section is affected by unit prices specified in Division 1.

1. Unit prices apply to authorized work covered by estimated quantities.

2. Unit prices apply to additions to and deletions from Work as authorized by Change Orders.

1.04 PRODUCT DELIVERY, STORAGE, AND HANDLING

A. Deliver materials to the site in the manufacturer's original and unopened containers and packing, bearing labels as to type of material, brand name, and manufacturer's name. Delivered materials shall be identical to approved samples.

B. Store materials under cover in a dry and clean location above the ground. Remove materials that are damaged or otherwise not suitable for use from the job site and replace with acceptable materials.

1.05 SUBMITTALS

A. Submit under provision of Division 1.

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B. Schedules and Procedures: Submit the following written schedule and procedures for all proposed masonry restoration operations.

1. Submit detailed sequence of operations and schedule of work for each masonry restoration operation.

2. Mortar mix.

C. Samples

1. Composite Patching Mortar: Before commencing any composite patching of brick, submit four (4) 3" x 3" x 3/4" samples of each color or colors of composite patching material.

2. (3) Replacement bricks.

3. Mortar - dry and cured. Mortar samples for color and texture matching. Provide a range of samples for the Architect to review. Do not proceed with mock-ups until Architect and City have approved a match. Mortar samples shall be two inches in diameter and approximately one inch thick, and shall be unmounted, to facilitate comparison with original, in-place mortar joints.

PART 2 - PRODUCTS

2.01 GENERAL

A. Source of materials: Obtain materials for masonry work from a single source for each type of material required (lime, cement, sand, etc.) to ensure match of quality, color texture, etc.

B. Use of salvaged brick: Sound brick units salvaged from other areas of construction associated with this project are to be used first, with compatible new brick used as a second course of action as needed.

2.02 MORTAR

A. Materials for Repointing:

1. Portland Cement:

a. Portland Cement: ASTM C 150, Type I, low alkali of natural color or white as needed to match historic mortar color.

2. Hydrated Lime: ASTM C 207, Type S.

3. Sand: Clean, washed natural sand with size and color gradations to match existing mortar samples, one source.

4. Water: Potable, free of deleterious amounts of oils, acids, alkalies, and organic matter.

5. Admixtures: The use of admixtures will not be permitted without the prior written approval from the Preservation Architect.

6. Other materials may be required to replicate original pointing mortars as outlined in test report.

B. Mortar Mix Design: Type O.

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2.03 BRICK

A. Match existing brick in color, size and texture.

B. Composite patching mixture for damaged bricks: Edison Custom System 45, as manufactured by Edison Coatings, 3 Northwest Drive, Plainville, CT 06062; (800) 697-8055. Factory sample analysis may be necessary for color matching.

PART 3 - EXECUTION

3.01 COMPOSITE PATCHING

A. Do not commence with composite repair operations until field sample installations are in place and approved.

B. Follow all manufacturer's recommendations for application of composite patching material.

C. Surface Preparation

1. Remove all loose, unsound, or deteriorated brick back to sound material. Leave substrate with a rough surface.

D. Installation

1. For composite repairs less than 1" in thickness, undercut the edges of repair areas to a slight dovetail. Drill 1/2" diameter holes in 1/2" deep, at varied angles spaced 2"-3" apart in staggered rows.

2. Prior to application of composite filling material, wash substrate thoroughly with water and brush with a stiff fiber bristle brush to remove all dust and stone fragments. Allow stone substrate to surface dry prior to patching.

3. Build up composite patching with coat thicknesses conforming to the manufacturer's recommendations, but never in layers thicker than one inch.

4. Before applying additional coats, allow the previous coat to cure for the time recommended by the manufacturer.

5. Use wood screeds set in adjacent mortar joints to prevent repairs from extending continuously between separate blocks of stone.

6. When composite has cured, tool, or hone surface as required to match surrounding finished surface texture.

7. Separation at the edges of the patch and hairline cracking will be unacceptable. Patches shall be removed and refilled if deemed unacceptable by the Architect.

3.02 REPOINTING

A. Do not commence repointing operations until field samples are in place and approved.

B. Surface Preparation

1. Remove all loose or deteriorated layers of mortar by hand or chisel.

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3.03 CLEAN-UP

A. All residue and debris from protection and removal work is to be removed from existing construction leaving the premises clean and neat.

B. Disposal of debris shall be in accordance with all federal, state, and local regulations.

END OF SECTION