07 24 00.pdf

Tionsta Dam, Control Tower EIFS Repair

SECTION TABLE OF CONTENTS

DIVISION 07 - THERMAL AND MOISTURE PROTECTION

SECTION 07 24 00

EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS)

PART 1 GENERAL

1.1 SCOPE OF WORK

1.2 CRITERIA FOR BIDDING

1.3 REFERENCES

1.4 SYSTEM DESCRIPTION AND REQUIREMENTS

1.4.1 Background Information

1.4.2 Repairs

1.4.2.1 General Requirements

1.4.2.2 Inspection

1.4.2.3 Cleaning

1.4.2.4 Repair

1.4.2.5 New Finish

1.4.2.6 Sealing Around Doors and Windows

1.4.2.7 Removal and Reinstallation

1.4.3 Component Requirements and Tests

1.4.3.1 Surface Burning Characteristics

1.4.3.2 Radiant Heat

1.4.3.3 Impact Resistance

1.4.4 Sub-Component Requirements and Tests

1.4.4.1 Abrasion Resistance

1.4.4.2 Accelerated Weathering

1.4.4.3 Mildew Resistance

1.4.4.4 Salt Spray Resistance

1.4.4.5 Water Resistance

1.4.4.6 Absorption-Freeze/Thaw

1.5 SUBMITTALS

1.6 QUALITY ASSURANCE

1.6.1 Qualifications of EIFS Manufacturer

1.6.2 Qualification of EIFS Installer

1.6.3 Qualification of Sealant Applicator

1.6.4 Qualifications of Inspector

1.6.5 Pre-Installation Conference

1.7 DELIVERY AND STORAGE

1.8 ENVIRONMENTAL CONDITIONS

1.9 WORK PLAN

1.10 WARRANTY

PART 2 PRODUCTS

2.1 COMPATIBILITY

2.2 ADHESIVE

2.3 THERMAL INSULATION

2.3.1 Manufacturer's Recommendations

2.3.2 Insulation Board

2.4 BASE COAT

SECTION 07 24 00 Page 1 W911WN-10-B-0004 Revised by Amendment 0001

2.5 PORTLAND CEMENT

2.6 REINFORCING FABRIC

2.7 FINISH COAT

2.8 SEALANT PRIMER

2.9 ACCESSORIES

2.10 JOINT SEALANT

2.11 BOND BREAKER

2.12 BACKER ROD

2.13 ACRYLIC COATING

2.14 WATER

PART 3 EXECUTION

3.1 INSPECTION

3.2 EXAMINATION

3.3 SURFACE PREPARATION

3.4 REPAIR

3.4.1 Insulation Board

3.4.1.1 Adhesively Fastened Insulation Boards

3.4.2 Base Coat and Reinforcing Fabric Mesh,

3.4.2.1 Class PB Systems

3.4.3 Finish Coat

3.5 JOINT SEALING

3.5.1 Surface Preparation, Backer Rod, and Primer

3.5.2 Sealant

3.6 CLEANING EIFS

3.7 RECOAT SURFACE

3.8 FIELD QUALITY CONTROL

3.9 CLEANUP

-- End of Section Table of Contents --

SECTION 07 24 00 Page 2

SECTION 07 24 00

EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS)

PART 1 GENERAL

1.1 SCOPE OF WORK

The work under this section consists of inspection, cleaning and repair of the exterior insulation and finish system (EIFS) on the Control Tower at Tionesta Lake, Tionesta Creek, near Tionesta in Forest County, Pennsylvania.

1.2 CRITERIA FOR BIDDING

Base bids on the following criteria:

a. The entire surface of the existing EIFS will be cleaned.

b. All sealants andat doors, windows, and similar penetrations will be cleanedremoved and the joints will be and resealed.

c. The base quantity for repair is based on visual observation. Most of the damage appears to be on horizontal surfaces at window sills and above the smaller windows, and similar projections. It is assumed that the vertical surfaces immediately below them will be replaced. It is also assumed that there may be similar damage on the top surface of the parapet and the vertical surfaces on each side will be replaced. There is also some damage at the vertical surfaces of window and door returns.

d. The additional quantity for repair is based on as assumed additional amount of repair estimated to be required as a result of the inspection of the existing EIFS.

e. The information on quantity of repair is for information purposes only. The quantity of repair to be paid for will be based on the actual surface area or existing EIFS repaired regardless of its location on the structure.

f. The entire surface of the existing and repaired EIFS will be recoated.

1.3 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM B 117 (2007a) Standing Practice for Operating Salt Spray (Fog) Apparatus

ASTM C 150 (2007) Standard Specification for Portland Cement

ASTM C 67 (2008) Standard Test Methods for Sampling

SECTION 07 24 00 Page 3 and Testing Brick and Structural Clay Tile

ASTM C 920 (2008) Standard Specification for Elastomeric Joint Sealants

ASTM D 2247 (2002) Testing Water Resistance of Coatings in 100% Relative Humidity

ASTM D 3273 (2000; R 2005) Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber

ASTM D 968 (2005e1) Abrasion Resistance of Organic Coatings by Falling Abrasive

ASTM E 2098 (2000; R 2006) Determining Tensile Breaking Strength of Glass Fiber Reinforcing Mesh for Use in Class PB Exterior Insulation and Finish Systems (EIFS) after Exposure to a Sodium Hydroxide Solution

ASTM E 84 (2009) Standard Test Method for Surface Burning Characteristics of Building Materials

ASTM G 153 (2004) Operating Enclosed Carbon Arc Light Apparatus for Exposure of Nonmetallic Materials

EIFS INDUSTRY MEMBERS ASSOCIATION (EIMA)

EIMA TM 101.01 (1995) Freeze/Thaw Resistance of Exterior Insulation and Finish Systems (EIFS), Class PB

EIMA TM 101.86 (1995) Resistance of Exterior Insulation Finish Systems (EIFS), Class PB to The Effects of Rapid Deformation (Impact)

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 268 (2006) Determining Ignitibility of Exterior Wall Assemblies Using a Radiant Heat Energy Source

1.4 SYSTEM DESCRIPTION AND REQUIREMENTS

1.4.1 Background Information

The Control Tower is of reinforced concrete construction with brick veneer and steel windows and doors. The existing exterior insulation and finish system was applied in 1983 and covers the brick veneer above approximately elevation 1195. The manufacturer of the system is not known, but it was specified to be similar and equal to "Dryvit Quartzputz". The following information is furnished from the specifications for the 1983 EIFS installation:

a. Crack Repairs - There were a large number of cracks in the masonry

SECTION 07 24 00 Page 4 of the Control Tower which were primed and caulked prior to installation of the EIFS. Deteriorated masonry joints and larger cracks were routed out and backup rods shall be used.

b. System Installed - A three inch thick layer of insulation board was installed on all vertical walls from elevation 1194.6 + to the top of the parapet walls and was returned over the top of the parapet walls and on the inside of the parapet. Masonry projections, such as brick dentals and projecting bricks bricks (one inch projection) were covered by routing the back of the insulation or using thinner pieces of insulation to maintain a smooth outside surface for the EIFS. Masonry projections greater than one inch thick received a full three inches of insulation and the final wall configuration was parallel the original wall surface. Stone ornaments (shields) on each side of the Control Tower and the six stone blocks on the exterior walls (Reference Drawing 038e-U1-41/3.5, Typical End Elevation) were covered with a minimum of three inches of insulation and the exterior synthetic plaster system.

c. Window Treatment - The top row of windows located on the upstream and downstream sides of the Control Tower from elevation 1209.4+ to elevation 1216+ were removed (Reference Drawings 038e-U1-41/3.5, Upstream Elevation and 038e-U1-41/5.3 Large Window Detail). The 12 gage pressed metal frame along the top of the 6 inch x 6 inch H beam (horizontal framing member) was also removed. The 6 inch x 6 inch H beam (horizontal framing member) remained in place and were used as a support for framing in the area from which the upper windows were removed. The lower windows located from elevation 1200.0+ to elevation 1209.3+ and the four small windows located on the upstream and downstream face have been replaced with thermopane windows. The thickness of the insulation around the window jambs, header and sills is assumed to be approximately one inch thick to accommodate the replacement window installation.

d. Lettering - The cast aluminum lettering was removed, cleaned, and remounted on the new EIFS.

e. Reinforcing Mesh - Heavy reinforcing mesh was installed five feet high at areas adjacent to the service bridge on the downstream side of the Control Tower and adjacent to the concrete balcony on the upstream side of the Control Tower. In addition to the above areas, all final window openings were reinforced an additional layer of reinforcing mesh at each of the corners, where possible, to prevent cracking of the exterior synthetic plaster system at the corners.

1.4.2 Repairs

1.4.2.1 General Requirements

The repair system components shall be compatible with each other and with the substrate and existing EIFS, and the products of, a single manufacturer regularly engaged in inspecting and repairing EIFS. All materials shall be installed by an applicator approved by the system manufacturer. EIFS finish shall similar the the existing color and finish.

1.4.2.2 Inspection

There are known cracks in the existing EIFS, as well as erosion of horizontal surfaces, separation at horizontal/vertical corners of window sills, and damaged EIFS. The entire surface shall be inspected to locate

SECTION 07 24 00 Page 5 other damage to the existing system.

1.4.2.3 Cleaning

The existing EIFS shall be cleaned to remove accumulations of dirt, mold and other surface contaminants.

1.4.2.4 Repair

Existing damaged EIFS shall be repaired by removal of damaged insulation, mesh and finish, repair of the substrate as necessary, and installation of new insulation, patching material, and mesh as required and approved by the Contracting Officer.

1.4.2.5 New Finish

After completion of cleaning and repair, the a new finish shall be applied to the entire EIFS surface.

1.4.2.6 Sealing Around Doors and Windows

The existing sealant at doors, windows, and other openings shall be removed and the joints shall be cleaned and resealed.

1.4.2.7 Removal and Reinstallation

The cast aluminum lettering shall be removed prior to beginning repairs, cleaned, and remounted on the EIFS after the surface is recoated.

1.4.3 Component Requirements and Tests

The components of the system shall meet the performance requirements as verified by the tests listed below.

1.4.3.1 Surface Burning Characteristics

Conduct ASTM E 84 test on samples consisting of base coat, reinforcing fabric, and finish coat. Cure for 28 days. The flame spread index shall be 25 or less and the smoke developed index shall be 450 or less.

1.4.3.2 Radiant Heat

The system shall be tested in accordance with NFPA 268 on both the minimum and maximum thickness of insulation intended for use with no ignition during the 20-minute period.

1.4.3.3 Impact Resistance

Class PB Systems: Hemispherical Head Test; 28 day cured specimen of PB EIFS in accordance with EIMA TM 101.86. The test specimen shall exhibit no broken reinforcing fabric per EIMA TM 101.86 at an impact of 25-49 in/lb.

1.4.4 Sub-Component Requirements and Tests

Unless otherwise stated, the test specimen shall consist of reinforcing mesh, base coat, and finish coat applied in accordance with manufacturer's printed recommendations to the insulation board to be used on the building. For mildew resistance, only the finish coat is applied onto glass slides for testing. These specimen shall be suitably sized for the

SECTION 07 24 00 Page 6 apparatus used and be allowed to cure for a minimum of 28 days prior to testing.

1.4.4.1 Abrasion Resistance

Test in accordance with ASTM D 968, Method A. Test a minimum of two specimens. After testing, the specimens shall show only very slight smoothing, with no loss of film integrity after (132 gallons) of sand.

1.4.4.2 Accelerated Weathering

Test in accordance with ASTM G 153, Cycle 1. After 2000 hours specimens shall exhibit no visible cracking, flaking, peeling, blistering, yellowing, fading, or other such deterioration.

1.4.4.3 Mildew Resistance

Test in accordance with ASTM D 3273. The specimen shall consist of the finish coat material, applied to clean (3 inch by 4 inch) glass slides and shall be allowed to cure for 28 days. After 28 days of exposure, the specimen shall not show any growth.

1.4.4.4 Salt Spray Resistance

Test in accordance with ASTM B 117. The specimen shall be a minimum of (4 inch by 6 inch) and shall be tested for a minimum of 300 hours. After exposure, the specimen shall exhibit no observable deterioration, such as chalking, fading , or rust staining.

1.4.4.5 Water Resistance

Test in accordance with ASTM D 2247. The specimen shall be a minimum of (4 inch by 6 inch). After 14 days, the specimen shall exhibit no cracking, checking, crazing, erosion, blistering, peeling, or delamination.

1.4.4.6 Absorption-Freeze/Thaw

Class PB systems shall be tested in accordance with EIMA TM 101.01 for 60 cycles of freezing and thawing. No cracking, checking, or splitting, and negligible weight gain. Class PM systems shall be tested in accordance with ASTM C 67 for 50 cycles of freezing and thawing. After testing, the specimens shall exhibit no cracking or checking and have negligible weight gain.

1.5 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only or as otherwise designated. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. The following shall be submitted in accordance with Section

01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Work Plan; G, RE

Cleaning EIFS; G, RE

SECTION 07 24 00 Page 7

SD-03 Product Data

Adhesive; G, RE

Accessories; G, RE

Base coat; G, RE

Portland cement; G, RE

Reinforcing fabric; G, RE

Finish coat; G, RE

Joint Sealant; G, RE

Sealant Primer; G, RE

Bond breaker; G, RE

Backer Rod; G, RE

Acrylic Coating; G, RE

Insulation Board; G, RE

Include joint and other details, such as end conditions, corners, windows, and parapet. Include shelf life and recommended cleaning solvents in data for sealants. Include material safety data sheets (MSDS)for all components of the EIFS. The MSDS shall be available at the job site.

Warranty

SD-04 Samples

Color and Texture

SD-06 Test Reports

Abrasion resistance

Accelerated weathering

Impact resistance

Mildew resistance

Salt spray resistance

Absorption-freeze-thaw

Surface Burning Characteristics

Radiant heat

SD-07 Certificates

Qualifications of EIFS Manufacturer

SECTION 07 24 00 Page 8

Qualification of EIFS Installer

Qualification of Sealant Applicator

Certify that EIFS installer meets requirements specified under paragraph "Qualification of Installer," and that sealant applicator is approved by the EIFS Manufacturer.

Qualifications of Inspector

Submit filled-out inspection check list as required in paragraph "Quality Control," certifying that the installation of critical items meets the requirements of this specification.

SD-08 Manufacturer's Instructions

Repair

Manufacturer's standard printed instructions for the installation of the EIFS. Include requirements for condition and preparation of substrate, installation of EIFS, and requirements for sealants and sealing.

SD-09 Manufacturer's Field Reports

Inspection Reports

SD-10 Operation and Maintenance Data

EIFS

Include detailed finish repair procedures and information regarding compatibility of sealants with base and finish coatings.

1.6 QUALITY ASSURANCE

1.6.1 Qualifications of EIFS Manufacturer

The EIFS shall be the product of a manufacturer who has been in the practice of manufacturing and designing EIFS for a period of not less than 3 years, and has been involved in at least five projects similar to this project in size, scope, and complexity, in the same or a similar climate as this project.

1.6.2 Qualification of EIFS Installer

The EIFS Installer shall be trained by the EIFS manufacturer to perform the installation of the System and shall have successfully installed at least five projects at or near the size and complexity of this project. The contractor shall employ qualified workers trained and experienced in installing the manufacturer's EIFS.

1.6.3 Qualification of Sealant Applicator

The sealant applicator shall be experienced and competent in the installation of high performance industrial and commercial sealants and shall have successfully installed at least five projects at or near the size and complexity of this project.

SECTION 07 24 00 Page 9

1.6.4 Qualifications of Inspector

Submit evidence that inspector has current certification from the Exterior Design Institute or equal inspector certification as inspector for the installation of EIFS.

1.6.5 Pre-Installation Conference

After approval of submittals and before commencing any work on the EIFS, including installation of any insulation, and associated work, the Contracting Officer will hold a pre-installation conference to review:

a. Drawings, specifications, and samples;

b. Procedure for on site inspection and acceptance of EIFS substrate and pertinent details (for example, mock-up installation);

c. Inspection procedures; and

d. Safety requirements.

Pre-installation conference shall be attended by the Contractor, and all personnel directly responsible for inspection, installation and cleaning of the EIFS system, including sealant applicator. Before beginning EIFS work, the contractor shall confirm in writing the resolution of conflicts among those attending the pre-installation conference.

1.7 DELIVERY AND STORAGE

Deliver materials to job site in original unopened packages, marked with manufacturer's name, brand name, and description of contents. Store materials off the ground and in accordance with the manufacturer's recommendations in a clean, dry, well-ventilated area. Protect stored materials from rain, sunlight, and excessive heat. Keep coating materials which would be damaged by freezing at a temperature not less than 40 degrees F. Do not expose insulation board to flame or other ignition sources.

1.8 ENVIRONMENTAL CONDITIONS

a. Do not prepare materials or apply EIFS during inclement weather unless appropriate protection is provided. Protect installed materials from inclement weather until they are dry.

b. Apply sealants and wet materials only at ambient temperatures of 40 degrees F or above and rising, unless supplemental heat is provided. The system shall be protected from inclement weather and to maintain this temperature for a minimum of 24 hours after installation.

c. Do not leave insulation board exposed to sunlight after installation.

1.9 WORK PLAN

Prepare a plan describing proposed methods of access to the work area;

inspection procedures; equipment and materials to be used in the cleaning, repairs and new finish; and method of collecting and disposing of cleaning

SECTION 07 24 00 Page 10 agent and rinse water.

1.10 WARRANTY

Furnish manufacturer's standard warranty for the EIFS. Warranty shall run directly to Government and cover a period of not less than 5 years from date Government accepted the work.

PART 2 PRODUCTS

2.1 COMPATIBILITY

Provide all materials compatible with each other and with the substrate, and as recommended by EIFS manufacturer.

2.2 ADHESIVE

Manufacturer's standard product, including primer as required, and shall be compatible with substrate and insulation board to which the system is applied.

2.3 THERMAL INSULATION

2.3.1 Manufacturer's Recommendations

Provide only thermal insulation recommended by the EIFS manufacturer for the type of application intended.

2.3.2 Insulation Board

Insulation board shall be standard product of manufacturer and shall be compatible with other systems components. Boards shall be factory marked individually with the manufacturer's name or trade mark, the material specification number, the R-value at 75 degree F, and thickness. No layer of insulation shall be less than (3/4 in) thick. Insulation Board shall be certified as aged, in block form, prior to cutting and shipping, a minimum of 6 weeks by air drying, or equivalent. Insulation board shall be similar to the existing EIFS material and of the thickness required to match the existing surfaces.

2.4 BASE COAT

Manufacturer's standard product and compatible with the existing EIFS and other systems components.

2.5 PORTLAND CEMENT

Conform to ASTM C 150, Type I or II as required, fresh and free of lumps, and approved by the systems manufacturer.

2.6 REINFORCING FABRIC

Reinforcing fabric mesh shall be alkali-resistant, balanced, open weave , glass fiber fabric made from twisted multi-end strands specifically treated for compatibility with the other system materials, and comply with ASTM E 2098 and as recommended by EIFS manufacturer.

SECTION 07 24 00 Page 11

2.7 FINISH COAT

Manufacturer's standard product conforming to the requirements in the paragraph on Sub-Component Requirements and Tests. For color consistency, use materials from the same batch or lot number.

2.8 SEALANT PRIMER

Non-staining, quick-drying type recommended by sealant manufacturer and EIFS manufacturer.

2.9 ACCESSORIES

Conform to recommendations of EIFS manufacturer, including trim, edging, anchors, expansion joints. All metal items and fasteners to be corrosion resistant.

2.10 JOINT SEALANT

Non-staining, quick-drying type meeting ASTM C 920, as Type S or M, minimum Grade NS, minimum Class 25 and compatible with the finish system type and grade, and recommended by both the sealant manufacturer and EIFS manufacturer.

2.11 BOND BREAKER

As required by EIFS manufacturer and recommended by sealant manufacturer and EIFS manufacturer.

2.12 BACKER ROD

Closed cell polyethylene free from oil or other staining elements and as recommended by sealant manufacturer and EIFS manufacturer. Do not use absorptive materials as backer rod. The backer rod should be sized 25 percent larger than the width of the joint.

2.13 ACRYLIC COATING

Coating shall be a high-build acrylic coating formulated for coating EIFS

2.14 WATER

All water required for cleaning or mixing shall be furnished by the Contractor. Water shall be potable.

PART 3 EXECUTION

3.1 INSPECTION

Inspect the entire Control Tower EIFS for water penetration, delamination, and other damage. Inspection shall be performed by an inspector qualified in the evaluation of EIFS. The inspection shall include thorough visual examination and, as a minim, use of pin-type meters or other approved methods to determine moisture content in the insulation. The inspector shall prepare Inspection Reports describing the inspection methods and results. The report shall include sketches of the existing system and identify defects based on the inspection. The inspection report shall be submitted within 4590 calendars after receipt of Notice to Proceed.

SECTION 07 24 00 Page 12

3.2 EXAMINATION

Examine substrate and existing conditions to determine that the EIFS can be installed as required by the EIFS manufacturer and that all work related to the EIFS is properly coordinated. Surface shall be sound and free of oil, loose materials or protrusions which will interfere with the system installation.

3.3 SURFACE PREPARATION

Remove existing damaged EIFS to the extent required to make proper repairs as recommended by the repair material manufacturer and approved by the Contracting Officer. Edges of repair areas shall be cut to straight lines. Prepare existing surfaces for application of the EIFS surface preparation according to manufacturer's installation instructions. Provide clean surfaces free of oil and loose material without protrusions adversely affecting the installation of the insulation board. Use masking tape to protect areas adjacent to the EIFS to prevent base or finish coat to be applied to areas not intended to be covered with the EIFS and to protect existing EIFS that is not to be removed. The Contractor shall not proceed with the installation until all noted deficiencies of the substrate are corrected. Remove the existing finish minimum of 3 inches beyond the removal area. Remove existing sealant and backup material at window and door returns and other similar areas.

3.4 REPAIR

Comply with manufacturer's instructions except as otherwise specified.

EIFS shall be installed only by an applicator trained by the EIFS repair material manufacturer. Specifically, include all manufacturer recommended provisions regarding flashing and treatment of wall penetrations. Small cracks in insulation that do not involve further deterioration may be repaired by routing out and filling with approved foamed-in place insulation or slivers of board insulation. Surface cracks that do not penetrate the reinforcing mesh may be repaired using the finish material as recommended by the finish manufacturer.

3.4.1 Insulation Board

Provide flush surfaces at joints. Use L-shaped insulation board pieces at corners of openings. Joints of insulation shall be butted tightly.

Surfaces of adjacent insulation boards shall be flush at joints. Gaps greater than (1/16 inch) between the insulation boards shall be filled with slivers of insulation. Uneven board surfaces with irregularities projecting more than (1/16 inch) shall be rasped in accordance with the manufacturer's instructions to produce an even surface. Attach insulation board as recommended by manufacturer. The adhered insulation board shall be allowed to remain undisturbed for 24 hours prior to proceeding with the installation of the base coat/reinforcing mesh, or longer if necessary for the adhesive to dry. However, do not leave insulation board exposed longer than recommended by insulation manufacturer.

3.4.1.1 Adhesively Fastened Insulation Boards

Apply insulation board using adhesive spread with a notched trowel to the back of the insulation boards in accordance with the manufacturer’s instructions.

SECTION 07 24 00 Page 13

3.4.2 Base Coat and Reinforcing Fabric Mesh,

3.4.2.1 Class PB Systems

Allow the adhered insulation board to dry for 24 hours, or longer if necessary, prior to proceeding with the installation of the base coat/reinforcing fabric mesh. Install reinforcing fabric in accordance with manufacturer's instructions. Mix base coat in accordance with the manufacturer's instructions and apply to insulated wall surfaces to the thickness specified by the system manufacturer and provide any other reinforcement recommended by EIFS manufacturer. Trowel the reinforcing fabric mesh into the wet base coat material. Fully embed the mesh in the base coat. When properly worked-in, the pattern of the reinforcing fabric mesh shall not be visible. Provide diagonal reinforcement at opening corners. Back-wrap or edge wrap all terminations of the EIFS. Overlap the reinforcing fabric mesh a minimum of 2.5 inches on previously installed mesh, including existing well-adhered EIFS, in accordance with the manufacturer’s instructions.

3.4.3 Finish Coat

The base coat/reinforcing mesh must be allowed to dry a minimum of 24 hours prior to application of the finish coat. Surface irregularities in the base coat, such as trowel marks, board lines, reinforcing mesh laps, etc., shall be corrected prior to the application of the finish coat. Apply and level finish coat in one operation. Obtain final texture by trowels, floats, or by spray application as necessary to achieve the required finish matching the existing installation. Apply the finish coat to the dry base coat maintaining a wet edge at all times to obtain a uniform appearance.

The thickness of the finish coat shall be in accordance with the system manufacturer’s current published instructions. Apply finish coat so that it does not cover surfaces to which joint sealants are to be applied.

3.5 JOINT SEALING

Seal EIFS at openings as recommended by the system manufacturer. Apply sealant only to the base coat or base coat with EIFS Manufacturer's color coating. Do not apply sealant to the finish coat.

3.5.1 Surface Preparation, Backer Rod, and Primer

Immediately prior to application, remove loose matter from joint. Ensure that joint is dry and free of finish coat, or other foreign matter.

Install backer rod. Apply primer as required by sealant and EIFS manufacturer. Check that joint width is no less than 0.5 inch for perimeter seals and 0.75 inch for expansion joints. The width shall not be less than 4 times the anticipated movement. Check sealant manufacturer's recommendations regarding proper width to depth ratio.

3.5.2 Sealant

Do not apply sealant until all EIFS coatings are fully dry. Apply sealant in accordance with sealant manufacturer's instructions with gun having nozzle that fits joint width. Do not use sealant that has exceeded shelf life or can not be discharged in a continuous flow. Completely fill the joint solidly with sealant without air pockets so that full contact is made with both sides of the joint. Tool sealant with a round instrument that provides a concave profile and a uniformly smooth and wrinkle free sealant surface. Do not wet tool the joint with soap, water, or any other liquid

SECTION 07 24 00 Page 14 tooling aid. During inclement weather, protect the joints until sealant application. Use particular caution in sealing joints between window and door frames and the EIFS wall and at all other wall penetrations. Clean all surfaces to remove excess sealant.

3.6 CLEANING EIFS

The entire surface of the EIFS shall be cleaned using cleaning products and methods recommended by the coating manufacturer for cleaning of EIFS surfaces. Acid shall not be used for cleaning EIFS, except that dilute concentrations may be applied for localize removal of efflorescence. The surface shall be presoaked with cold water prior to application of the cleaning agent. The cleaning agent shall be supplemented with other products as required to remove mildew and algae. Cleaning agent may be applied using low pressure spray not to exceed 50 psi. The cleaning process shall kill microorganisms causing the algae or mildew. Light scrubbing with soft bristle brush shall be performed as necessary to remove surface contamination. Rinsing shall be accomplished using clean, cold water at a pressure ofsufficient to remove all cleaning products, but not more than 600 psi. Rinsing shall be performed from top to bottom and shall be accomplished before the cleaning agent dries. Cleaning agent and rinse water shall not be permitted to enter the lake, but shall be collected for disposal offsiteshall be classified as environmentally-friendly or non-polluting.

3.7 RECOAT SURFACE

After completion of repairs, the entire surface of the EIFS shall be recoated. Surface preparation and application of coating shall be in accordance with the coating manufacturer's recommendations.

3.8 FIELD QUALITY CONTROL

Throughout the installation, the contractor shall establish and maintain an inspection procedure to assure compliance of the installed EIFS with contract requirements. Work not in compliance shall be removed and replaced or corrected in an approved manner. The inspection procedures, from acceptance of deliveries through installation of sealants and final acceptance shall be performed by qualified inspector trained by the manufacturer. No work on the EIFS shall be performed unless the inspector is present at the job site.

3.9 CLEANUP

Upon completion, remove all scaffolding, equipment, materials and debris from site. Remove all temporary protection installed to facilitate installation of EIFS.

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SECTION 07 24 00 Page 15

3.4.3 Finish Coat