Attachment_10_-_Specs_Section_07240_(General_Removal_of_Mold_and_Mildew),_Dated_24_July_2019.pdf

MAHG19-1042

24 JULY 2019

SECTION 07240

GENERAL CLEANING AND REMOVAL OF MOLD AND MILDEW

ON EXTERIOR INSULATED AND FINISH SYSTEMS AND STUCCO

PART 1: GENERAL

1.1 DESCRIPTION AND SCOPE

A. Requirements contained within Division I (General Requirements) are applicable to the work required of this section. Provide labor, materials, equipment and supervision necessary to complete the cleaning of the exterior wall and finish systems including:

1. Substrate inspection and preparation

2. Protection of damaged wall areas

3. Protection of adjacent materials sensitive to cleaning

4. Protection of plants and sensitive vegetation

5. Use of safety equipment

6. Handling and mixing of cleaning chemicals

7. Operation of application equipment

8. Final inspection of and assessment of cleaning

B. Referenced Documents:

Standards ASTM D4610: Standard Guide for Determining the Presence of and Removing

Microbial Growth on paint and Related Coatings

ASTM F923: Guide for High visibility Materials to Improve Individual Safety

ASTM E1542: Terminology Relating to Occupational Health and Safety

ASTM D2020: Standard Test Method for Sampling and Analysis of Chlorine Containing Bleaches

ASTM D460: Standard Method for Sampling and Analysis of Soap Products

ASTM D3274: Test Method for Evaluating the Degree of Surface Disfigurement of Paint Films by Microbiological Growth or Soil and Dirt accumulation

ASTM C920: Joint Sealants

ASTM C1193: Use of Joint Sealants

C. Terms and Definitions

1. Exterior Insulated and Finish System (EIFS) and Hard Coat Stucco EIFS is a non-bearing exterior cladding consisting of a layer of rigid insulation board and an outer lamina. The lamina consists of a fiberglass mesh reinforced base coat layer and an outer layer of synthetic stucco finish. A hard Coat Stucco system is a Portland cement plaster base top-coated with a synthetic finish or plaster finish.

2. Bleach - An alkaline aqueous solution of a known quantity of sodium hypochlorite.

3. Borax - A white powder consisting of Sodium Metaborate.

4. Soap -A chemical designed to lower the surface tension of water and promote an oil-in-water emulsion system.

5. Microbiological Growth – the presence of algae, fungus, bacterial or their related byproducts including spores or mycotoxins.

6. Dirt pickup – the accumulation of soil, dirt and pollutants on a surface.

7. Sealant -A permanently flexible self-sticking compound that is used to seal seams in the system.

1.2 DESIGN LIMITATIONS

All procedures shall conform to job document recommendations and shall be consistent with the project requirements.

A. Substrate

1. The optimum equipment necessary to access all wall areas to be treated will be determined.

2. All areas to masked and protected will be determined.

3. All damaged areas including sealant will be protected or repaired.

B. Safety

1. Proper safety equipment will be available for all laborers.

2. Areas to be cordoned off will be determined.

3. Wind velocity will be monitored.

C. Inspection

1. If desired, coating deterioration due to microbiological activity or dirt contamination assessment IAW ASTM D3274 will be made prior to cleaning.

2. Photographic record and written record of the wall surface condition will be made prior to cleaning.

3. Photographic record and written record of the cleaning process and result will be made.

D. Joints

1. The condition of the sealant joints will be noted. Failed joints will be protected by masking during the cleaning process unless repaired under separate contract prior to cleaning

1.3 QUALITY ASSURANCES

A The contractor shall have a minimum of one year experience in the wall construction and cleaning trades, demonstrate the ability to clean the wall based on projects of similar size and complexity, and meet the approval of the general manager.

B The contractor shall provide the equipment, manpower, materials and supervision necessary to clean the wall system in compliance the project plans and specifications.

1.4 SUBMITTALS

A. The submittal consisting of this bid specification and supporting contractor documentation will be provided to the building owner-representative.

1.5 PRODUCT DELIVERY AND STORAGE

A Delivery: Deliver all materials necessary for cleaning in original, unopened containers with legible identification intact.

B Storage:

1. Store all materials off the ground, under cover and protected from dampness and sunlight.

2. All liquid products shall be stored at 40 F or above and protected from freezing.

Protect from exposure to direct sunlight during storage and temperatures exceeding 110 F.

3. Keep materials secure from children, pets and the general public.

1.6 JOB CONDITIONS

A. Install all materials in strict accordance with all safety and weather conditions required by this specification.

B. Apply cleaning solution when the ambient temperature is 40 F (4.4 C) and rising. Do not apply or rinse solutions on a frozen surface.

C. Avoid application in high wind (wind speeds in excess of 12 mph). Avoid application in direct sunlight as this will reduce the effective contact time of the cleaning solution.

D. Protect surrounding areas and sensitive surfaces including metalized glass during application and rinsing of the cleaning solution.

E. Hot walls may be cooled by rinsing with clear water prior to cleaning application.

1.7 COORDINATION AND SCHEDULING

A. Closely coordinate work with related sections and trades.

B. Protect the tops of walls to prevent water from entering behind the system.

C. Protect open joints or penetrations from water intrusion.

1.8 SYSTEM WARRANTY

A. A Warranty application for warranty form shall be completed prior to completion of the installation.

B. Upon completion of the installation in accordance with specifications and payment of monies due, a limited 90 day materials Warranty shall be issued.

PART 2: MATERIALS

2.1 SAFETY EQUIPMENT

A. All persons handling the mixing or application of the cleaning solution shall wear the following safety equipment:

1. Full coveralls

2. Rubber gloves

3. Safety goggles

4. Dust, mist, fume mask

5. Hat or other head covering

2.2 CLEANING SOLUTION MATERIALS

A. NOT ALLOWED - Chlorine Bleach.

B. NOT ALLOWED - Borax.

C. NOT ALLOWED - Liquid dish cleaning soap.

D. ALLOWED – WATER ONLY. Cleaning requires a faucet source of clean, potable water.

*PER STORMWATER PERMIT, NO SOAPS, CHEMICALS OR DETERGENTS WILL BE

ALLOWED TO GO IN THE STORM DRAINS.

2.3 MIXING AND PREPARATION OF CLEANING SOLUTION

Cleaning solution – WATER ONLY.

PART 3 EXECUTION

3.1 EQUIPMENT

A. Have spray equipment available capable of delivering a low pressure spray or stream of cleaning solution and clear water to the wall areas to be treated.

B. Have sufficient manpower available for the use of equipment to access all wall areas.

This equipment may include bucket-lift trucks, drop staging, scaffolding, scissors scaffolding, and ladders.

3.2 SUBSTRATE

A. PREPARATION

1. Mask and protect all materials and surfaces that could potentially be sensitive to cleaning solution (water).

2. Cover or mask any openings, holes or damaged areas to prevent water or cleaning solution from entering the wall cavity.

B. SURROUNDING AREA

1. Protect plants and sensitive vegetation from over-spray with tarps or polyethylene sheeting.

2. Insure that cars and pedestrians are kept clear of potential overspray areas. If necessary, rope off these areas.

3. Insure that building windows are closed and that occupants are advised of the cleaning process.

C APPLICATION

1. Start at the upper wall areas and work downward.

2. Always use low-pressure spray for either the water spray or the cleaning solution. Spray pressures must never exceed 3000 psi.

3. If the wall is warm or if working in the sun in warm weather, wet the wall with clear water.

4. Starting at the top of a wall area, apply cleaning solution to the wall with a low-pressure spray or stream. Use horizontal sweeps to apply the cleaning solution.

Keep a six to twelve inch run-down of cleaning solution on the wall surface below the stream. Adjust the spray or stream to avoid excessive misting and bounce-back of the cleaning solution.

5. Treat entire vertical sections of wall area before moving to the next area.

6. Allow the WATER to have three to five minutes of contact time with the wall surface. Thoroughly rinse the wall surface beginning at the top with a clear water spray.

3.3 RE-APPLICATION

A. Wall areas may be re-cleaned one additional time, if necessary, following the above procedure to achieve a more thorough result. This will be determined by visual inspection after the first cleaning and permitting sufficient time for the wall area to dry.

3.4 JOB SITE CLEANUP

A. All excess materials, tarps, equipment and masking shall be removed from the job site by the applicator.

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B. All surrounding areas where materials have been applied shall be left free of debris and foreign substances.

3.5 INSPECTION

A. Building owner-representative will visit the job and inspect the walls prior to and after the cleaning in the presence of the applicator. Before and after photos will be taken by the applicator and dated for documentation purposes. Notes of the inspection will be made by the applicator and initialed by the applicator and building owner-representative. Both parties will retain a copy of the inspection notes.

END OF SECTION