B315 Technical Report and Specifications.pdf

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REPAIR – EXTERIOR INSULATION AND FINISH

SYSTEM

07 2400 - 1 of 7

PART 1 – GENERAL

SECTION 07 24 00

1.01 SECTION INCLUDES

A. Cleaning, patching, repairs, priming, skim and re-texturing, color coating restoration and sealant repair/replacement to existing Exterior Insulation and Finish System (EIFS) with or without drainage and/or Textured Acrylic Finishes (TAFS) over non-EIFS substrates.

1.02 RELATED SECTIONS

A. Section 02 2529 – Existing EIFS Material Assessment.

B. Section 07 9000 – Joint Sealers

1.03 REFERENCES

A. ASTM C150 - Portland Cement.

B. ASTM C578 – Expanded Polystyrene Thermal Insulation.

1.04 SUBMITTALS

A. Material and Equipment Submittals: Submit the following:

1. Product Data: Submit manufacturer's product data and installation instructions.

2. Samples: Submit two 12" x 12" samples illustrating color coating over f inish texture and color selected.

B. Quality Assurance Submittals: Submit the following:

1. Manufacturer's Certif icate: Indicating that applicator has been factory trained and approved, and possesses a current certif icate of Listing by Dryvit Systems, Inc.

C. Closeout Submittals: Submit the following:

1. Warranties: As specif ied in this Section.

2. Extra Materials: As specif ied in this Section.

1.05 QUALIFICATIONS

A. Installer: Company specializing in EIFS installation, repair, color coating restoration and sealant repair/replacement with minimum f ive years documented experience, factory trained by manufacturer, and Dryvit Listed.

B. Provide evidence of previously performed successful work of similar scope and complexity.

1.06 DELIVERY, STORAGE AND HANDLING

A. Deliver, store and protect products in accordance with manufacturer’s instructions.

B. Deliver products to site in manufacturer's original, unopened containers. Inspect for damage.

C. Store materials in cool, dry place out of direct sunlight, and protected f rom the elements. Do not store at less than 40 deg. F.

1.07 ENVIRONMENTAL REQUIREMENTS

A. Comply with exterior insulation and f inish system manufacturer’s requirements for temperatures and environmental conditions before during and af ter application.

1. The ambient air temperature shall be minimum 40 deg. F and rising at the time of installation. Maintain minimum 40 deg. F temperature for 24 hours following installation.

1.08 WARRANTY

A. EIFS System Restoration Warranty: Provide minimum ten (10) year limited warranty covering EIFS repair, skim and re-texturing and color coating materials proven to be defective within the warranty period.

B. High Performance Colorant Warranty: Provide a minimum six (5) year limited warranty covering UV fading for f inish materials tinted with Dryvit StratoTone high performance colorant for textured acrylic f inishes and/or color coatings. Warranty shall include repair, recoating, and replacement materials.

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1.09 EXTRA MATERIALS

A. Maintenance Materials: Submit one (1) – one (1) gallon pail of textured f inish and/or color coating for each color/texture selected.

PART 2 – PRODUCTS

2.01 ONLY APPROVED MANUFACTURER FOR EIFS SYSTEM AND/OR TEXTURED ACRYLIC

FINISHES (TAFS) SURFACE REPAIR AND RE-COATING.

A. Dryvit System, Inc., Outsulation or Outsulation Plus MD Exterior Insulation and Finish Systems (EIFS) and Textured Acrylic Finishes (TAFS). RFI during bidding process to get approved substitutions that meet characteristics of specified products.

2.02 MATERIALS

A. Portland Cement: ASTM C150, Type I.

2.03 COMPONENTS

A. Standard and Detail Reinforcing Fabric: Specially woven and treated for use in base coat layers.

1. Dryvit “Reinforcing Mesh”.

2. Balanced, open weave, glass f iber fabric. Min. 4.3 oz per sq. yard.

B. High Impact Reinforcing: Specially woven and treated for use in base coat layers.

1. Dryvit “Reinforcing Mesh”.

2. High impact reinforcing fabric shall be 20 oz. minimum weight / square yard.

3. High impact mesh shall be used in conjunction with Standard Reinforcing mesh.

4. High impact mesh shall be installed in Tank access areas.

07 2400 - 3 of 7

C. Stress Crack Patching Compound: A high performance, f lexible, elastomeric patching compound.

1. “ElastoPatch” Flexible Patching Compound as manufactured by DAP

2. For preparing sur surface cracks prior to application of textured f inish or architectural coating.

3. Available in smooth and textured grade as appropriate.

J. Finish/Texture: Factory mixed, 100 percent acrylic resin, integrally colored textured f inish.

1. Dryvit “DPR” Textured Finish.

2. Select f rom Dryvit “Standard” 1-coat texture options tinted with “StratoTone” high performance colorant.

3. For application of new acrylic textured f inish over prepared and primed new EIFS base coat or skim coat leveled and primed existing textured f inish surfaces which do not exhibit evidence of surface stress cracking.

4. Color schedule: Provide custom colors as necessary to match existing colors or colors specif ied on the drawings.

K. Hydrophobic Performance Architectural Color Coating: Factory mixed, high build, 100 percent acrylic resin, integrally colored smooth coating formulated with Hydrophobic Water-Repellant (HDP) performance properties and Proven Mold Resistance (PMR) chemistry.

1. “2 Coats” Dryvit HDP Water Repellant Paint" tinted with “StratoTone” high performance colorant

2. For color coating restoration of new or existing textured f inish surfaces over EIFS, non-EIFS or other acceptable prepared substrate surfaces which do not exhibit evidence of surface stress cracking.

3. Color schedule: Provide custom colors as necessary to match existing colors or colors specif ied on the drawings.

2.01 JOINT SEALANT

A. Joint Sealant: Joint Sealant materials, primers and accessories shall be as manufactured, recommended or approved by Tremco Commercial Sealants and Waterproof ing.

1. Application: Prepare surfaces to receive sealants and apply joint sealant, primers and backing material in strict accordance with current published guidelines, data sheets and application instructions by Tremco Commercial Sealants and Waterproof ing.

2. Silicone Sealant: Coordinate for standard or custom color as required. Select f rom the list below based on substate conditions, compatibility and use intent.

a. For use in new applications or repair / replace of existing silicone sealant where sealant materials will not be painted over.

1) Spectrem 1: An ultra low modulus, high-performance, one-part, moisture-curing silicone joint sealant with physical properties making it an ideal sealant for sealing dynamic joints.

i. Approved for EIFS applications when f irst primed with TREMprime Silicone Porous

Primer.

2.06 MIXES

A. Mix adhesive and base coat with Portland cement according to manufacturer's instructions. Do not use admixtures, such as accelerators, antif reeze agents, or pigments.

B. Manufacturer’s pre-blended / bagged products. Add water only to factory pre-blended bag mix.

PART 3 - EXECUTION

3.01 EXAMINATION

A. Verify that surfaces are ready to receive work.

B. Refer to Section 02 2529: Review existing conditions in the f ield and establish the scope of work for remediation and how to prepare existing surfaces for restorative coating. Submit proposed scope of work and verify scope with Architect/Owner prior to beginning installation.

C. Beginning of installation means installer accepts existing conditions. Do not proceed until unsatisfactory conditions have been properly corrected.

3.02 PREPARATION

A. Clean all existing EIFS textured f inish surfaces and all new patched, repaired, and/or replaced surfaces to remove chalk, dust, dirt, loose coatings and other foreign materials.

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1. For new or existing EIFS textured f inish surface cleaning, refer to Dryvit CARE EIFS Repairs Procedures DS-498, Sections DC001.

B. Patch and repair loose, spalled, stress-cracked or damaged areas to provide a suitable substrate for subsequent material installation.

1. For EIFS full system and/or EIFS textured acrylic f inishes (TAFS) surface patching or repairs, refer to Dryvit CARE EIFS Repairs Procedures DS-498, Sections DC002-DC015.

2. Installation of patching / repairs including new textured f inish shall match existing and be installed to the extent as necessary to provide a consistent overall textured surface throughout entire EIFS surface area.

3.03 INSTALLATION

A. Install all EIFS materials, products, and components in strict accordance with EIFS manufacturer’s current published application requirements.

1. For impact damage to Barrier EIFS clad facades resulting in full system cut out removal and replacement, down to face of underlying substrate, refer to Dryvit Applications Instructions DS-204.

For impact damage to EIFS with Drainage clad facades where the underlying paper based Water /Weather Resistive Barrier and/or underlying substrate surface has been compromised and where patching and repair is required, repair/replace underlying substrate as necessary and install equal or similar paper based Water/Weather Resistive Barrier over repaired, approved, and accepted substrate surface in accordance with the selected paper based and code approved Water/Weather Resistive barrier manufacturer's application instructions.

a. Properly lap new paper based Water/Weather Resistive barrier in a shingled fashion into existing paper based Water/ Weather Resistive barrier and tape/seal for the entire perimeter in a manner as necessary to create a complete and functioning drainage plane behind the EIFS with drainage clad facade.

2. Impact damage resulting in damage to the underlying wall assembly structure such as framing, etc, is outside of the scope of this specif ication and should be immediately brought to the attention of the Architect/Owner.

B. ElastoPatch Installation: On existing EIFS full system applications and for textured acrylic f inishes (TAFS) over non-EIFS substrate, apply ElastoPatch to bridge stress cracks.

1. For stress cracks f rom 1/32 inch up to 1/4 inch and1/2” deep: Fill stress crack with parching compound using a caulking gun, bruch, putty knife or trowel as required. Tool patched surface and feather out edge. For some repairs, more than one application may be required.

2. ElastoPatch treated surface areas shall require a complete re-skim of non-cementitious base coat prior to application of color prime and textured acrylic f inish.

3. Refer to DAP ElastoPatch Application Instructions.

4. Product is not sandable.

5. ElastoPatch is not required for stress cracks up to 1/32" wide.

C. Apply EIFS textured f inish coating in a uniform thickness over thoroughly dry reinforced and primed standard base coat or primed re-skim base coat layer.

1. Textured acrylic f inish coating shall be tinted in accordance with Custom Color schedule herein and/or construction drawings.

2. For color/textures other than those scheduled or indicated in construction drawings, contact Architect/Owner for coordination and approval.

3. Do not return textured acrylic f inish into joints detailed to receive applications of sealant.

a. Return edges fully base coated and detailed to receive applications of sealant shall be coated with Dryvit “Color Prime” in advance of application of the respective sealant primer and sealant.

D. Apply Architectural Color Coating as specif ied and where applicable in a minimum of two coats and in a uniform thickness over cleaned and thoroughly dry existing EIFS or non-EIFS textured acrylic f inish surfaces which do not exhibit evidence of minor hairline stress cracking.

1. Architectural color coating shall be tinted in accordance with the Color Schedule herein or as indicated in Construction Drawings.

a. For colors other than those scheduled or indicated in construction drawings, contact

07 2400 - 5 of 7

Architect/Owner for coordination and approval.

2. Architectural color coating shall be applied over Color Primer where required and in strict accordance with manufacturer's application instructions.

3. Apply in uniform thickness coats, without runs, drips, pinholes, brush marks, or variations in color, texture, or f inish. Finish edges, crevices, corners, and other changes in dimension with full coating thickness.

E. Prepare EIFS edges to receive applications of sealant in accordance with EIFS and selected sealant manufacturer’s current published guidelines.

1. Selected sealant manufacturer / sealant and primer products shall be compatible with

EIFS coatings and selected f rom those products outlined in Section 07 9000 – Joint Sealers.

3.04 PROJECT CLEAN UP

A. Remove excess materials and debris f rom job site.

B. Remove all overspray, drips, and splashes f rom adjacent surfaces (sidewalks, paving, window frame f lashing, walls, etc.)

1. Cleaning agents other than clean water shall be biodegradable detergent.

3.05 PROTECTION

A. Protect f inished installation.

END OF SECTION

DISCLAIMER

It is the responsibility of both the specif ier and the purchaser to determine if a product is suitable for its intended use. The designer selected by the purchaser is responsible for all decisions pertaining to design, detail, structural capability, attachment details, shop drawings and the like. The Exterior Insulation and Finish System with Moisture Drainage Manufacturer has prepared guidelines in the form of specif ications, installation details, application instructions and product data sheets to facilitate the design process only.

The Manufacturer is not liable for any errors or omissions in design, detail, structural capability, attachment details, shop drawings, or the like, whether based upon the information prepared by the Manufacturer or otherwise, or for any changes which purchasers, specif iers, designers, or their appointed representatives may make to the Manufacturer’s published comments.

Information contained in this specif ication conforms to standard detail and product recommendations for the installation of the Dryvit Outsulation Plus MD System products as of the date of publication of this document and is presented in good faith. Dryvit Systems, Inc. assumes no liability, expressed or implied, as to the architecture, engineering or installation of any project. To insure that you are using the latest, most complete information, visit our website at www.dryvit.com or contact Dryvit Systems, Inc., at:

One Energy Way West Warwick, RI 02893

(401) 822-4100 www.dryvit.com

The Trained Contractor Certif icate referenced in this guide specif ication indicates certain employees of the EIFS sub-contractor company have been instructed in the proper application of Dryvit products and have received copies of Dryvit’s Application Instructions and Specif ications. The Trained Contractor Program is not an apprenticeship or endorsement. Each trained contractor is an independent company experienced in the trade and bears responsibility for its own quality. Dryvit Systems, Inc. assumes no liability for the performance of a trained contractor.

Building Envelope Scope of Repair

Portland Air National Guard – Building B315

Senior Field Advisor

Tremco Roofing & Building Maintenance

Re: Portland Air National Guard Building B315 Building Envelope Scope of Repair

The following written conceptual scope of repair summary outlines our recommendations to correct the key defective conditions that are impacting the performance of the building envelope, specifically the in-service barrier (face sealed) exterior insulation finish system (EIFS). This narrative serves to repair resultant damage, prevent future water leaks, and reinstate the building envelope assemblies into a functional and maintainable system for their intended service life.

This scope is intended for planning and estimating purposes only and is not to be used for construction, sufficiently detailed to obtain “rough-order-of-magnitude” or ROM pricing. Repairs are to be performed per in accordance with the requirements of the latest adopted editions of the Oregon Structural Specialty Code (OSSC), Oregon Energy Efficiency Specialty Code (OEESC), National Roofing Contractors Association (NRCA) Roofing Manual: Membrane Roof Systems, and manufacturer’s installation guidelines.

Property Description

The subject property, building B315, serves as the garrison for the US Air Force’s 304th Rescue Squadron. The structure is a single-story in height, with the predominant envelope assembly being EIFS at the opaque walls, with select areas of metal panel cladding. Aluminum windows are set into punched openings, and a steep slope roof assembly with standing seam panels provides protection to the structure below.

As a function of our visual assessment, representatives from Certa and Tremco performed scanning of the in-service EIFS with non-destructive moisture meters. Several zones of the façade were identified as likely to be wet, as EIFS of this vintage is referred to as a “barrier” or “face sealed” system, meaning that there are no provisions for drainage. There are also numerous areas where the gutters above are leaking, with signs of targeted maintenance being performed previously.

Project Reference: OR24-064.00 certasolutions.com

General Conditions

1. Project general requirements and miscellaneous costs associated with the completion of the work shall include, but not be limited to, demolition and disposal, water damage remediation, wall cladding rehabilitation, window rehabilitation, roof rehabilitation, and project clean up.

2. Carry pricing for appropriate supervision, project management, and office services.

Provide required on-site temporary office, material storing and staging, full-time weather protection, scaffolding, staging and access, temporary shoring, temporary fencing safeguards, pedestrian protection, work facilities, construction offices, utility cost, security submittals, RFI’s, mock-ups, and project progress meetings. Maintain a set of record drawings as part of the work.

3. Contractor shall provide an organizational chart with the proposal for staffing the project.

Staffing must include a Project Manager, and a full-time Site Superintendent that is responsible for trade coordination and quality control.

4. Carry costs for performance, payment bonding, CGL Insurance, and other overhead costs.

The Contractor shall submit as part of the proposal proof of liability insurance and sufficient bonding capacity to cover the project.

5. Contractor to supply dumpsters and fees necessary to complete the project.

6. Provide necessary preparations and site mobilization costs to perform the Work within the base cost.

7. Take reasonable steps to control odors and volatile organic compounds (VOCs) originating from the application of wall and waterproofing membranes, primers, sealants, and other odorous construction products. Advise the Client in advance of the application of such products so that residents have an opportunity to seek accommodation elsewhere if necessary.

8. Metal fasteners and connectors shall have sufficient corrosion resistance to correspond to the expected service life of the materials, components, and assemblies they are affixing.

Metal fasteners shall have minimum of hot-dipped galvanized, stainless steel, or be otherwise coated to pass a minimum 1500-hour salt-spray when evaluated in accordance with ASTM B117.

START OF SCOPE

Water-Managed EIFS - Exterior Cladding

9. The scope describing Water-Managed Exterior Insulation and Finish System (EIFS) in this section is applicable to all exterior walls.

10. Remove and dispose of the existing EIFS system, accessories (vinyl closures, control joints, etc.) fasteners, existing water-resistive barriers, flashing membranes, to expose the underlying wall sheathing.

11. Remove and dispose of the existing metal panel cladding system to expose the underlying wall sheathing.

12. Allowance 1 – Damaged Existing Sheathing: Replace damaged gypsum encountered as part of the work with new Georgia Pacific DensGlass Gold sheathing of matching thickness of panels to be replaced. Contractor shall carry an allowance value of $3,000 for the removal and replacement of existing gypsum sheathing found to be damaged.

a. Secure new gypsum sheathing using 1-1/4 in. long, self-tapping, bugle-headed, corrosion-resistant screws, 6 in. OC at panel edges and in the field. Where existing board is installed with ferrous screws, remove the screws and replace them with stainless steel.

13. Where existing windows will be replaced, remove and dispose of the existing windows so that the liquid applied flashings and air barrier can transition inward to protect the rough openings. Refer to “Punched Windows” section.

14. Install a new water-managed exterior insulation and finish system using vapor-impermeable, cold fluid-applied water-resistive air barrier over the outer plane of the existing wall sheathing. The Basis of Design is the Dryvit Outsulation Plus MD system with Dryvit Backstop NTX Smooth used as the fluid-applied water-resistive air barrier with proprietary system components:

15. Detail penetrations, transitions, and terminations to achieve air and water-tight installation.

16. Apply Dryvit Backstop NTX Smooth liquid applied water-resistive membrane and Dryvit AquaFlash cold fluid-applied flashing as a system, into rough openings of windows and doors.

a. At windows and doors to remain, transition AquaFlash onto the adjacent frame, providing a complete seal from the new system to the fenestration to remain.

17. Apply the cold fluid-applied flashing membrane (Dryvit AquaFlash) per the manufacturer’s published instructions.

18. Where system meets concrete walls near grade, apply a cove (fillet) seal of the Dryvit AquaFlash membrane at the 90-degree transition. Allow to cure tack free.

19. Head Flashing at Windows and Doors to Remain: For the head flashing, fabricate a continuous head flashing from 24-gauge prefinished sheet steel. Coating shall confirm to

AAMA 2605, min. Provide folded end dams, 15-degree slope to drain, 2 in. down leg with hemmed drip profile.

a. Wet set the vertical flashing leg of the head flashing in a full bed of flashing membrane and anchor with corrosive-resistant screws.

b. Apply Dryvit AquaFlash, fully reinforced, over the vertical flashing leg of the flashing with full tie-in to the surrounding liquid-applied field water-resistive air barrier. Coordinate the width and depth of the head flashing to tie into the sealant joints at the jambs of the opening and project out from the wall face sufficiently to extend past the finish face by 3/4 in.

20. Apply Dryvit AquaFlash, fully reinforced with appropriate accessories at penetrations and transitions to that the flashing system seals the component and extends as required over the outer plane of the cured field water-resistive air barrier.

21. EIFS Adhesive: With use of a notched trowel, apply Dryvit Genesis acrylic-modified adhesive over the cured Backstop WRB.

a. Notches shall be a minimum of 3/8 in. wide, 1/2 in. deep, and spaced 1-1/2 in.

apart.

b. The intent is that the adhesive zone between the backside of the insulation and outer plane of the structure serves as the drainage cavity for the new, water-managed EIFS system.

22. Insulation: Apply 2 in. thick Dryvit Expanded Polystyrene (EPS) insulation over the zones of adhesive, starting at the base of wall condition.

a. Take care to not overly shift the boards in such a manner that the notched profile of the wet adhesive is lost. Doing so will limit the system’s ability for drainage.

b. Rasp the backside of the lowest panels for a friction fit to the Dryvit starter track.

23. Install vertical control joints in the EPS to allow for building movement. For pricing, assume control joints at one side of each punched window opening and entry door, and at the head of both ends of sliding glass doors or other large wall penetrations. Provide additional jointing as required by the EIFS manufacturer.

24. Before installing the reinforced base coat (lamina), inspect the surface of the insulation board for:

a. Flatness: Use a minimum 8 ft straight edge. Sand any high areas and out-of-plane board joints flat.

b. Damage and foreign materials: correct deficiencies, as necessary.

c. Surface degradation due to weathering or UV, visible as discoloration: Sand the affected areas to remove deterioration while maintaining the flatness of the surface.

25. Lamina: Mix and apply Dryvit Genesis DM polymer-modified base coat per the manufacturer. Before installing the reinforcing mesh, and with the use of a stainless-steel trowel, apply the base coat on the surface of the insulation board in a uniform thickness of approximately 3/32 in.

26. Reinforcement at Windows: Before the application of reinforcement at the wall field, apply

9 in. x 12 in. diagonal strips of Dryvit Standard Mesh (4.3 oz./yd. weight) reinforcement at the corners of rough openings and penetrations, embedded into the wet base coat. Trowel from the center to the edges of the mesh.

27. Reinforcement at Corners: Before the application of reinforcement at the wall field, apply

Dryvit Corner Mesh (7.2 oz./yd. weight) reinforcement at the inside and outside corners.

Ensure that the reinforcement extends out onto the adjacent wall planes a minimum of 8

in. into the wet base coat. Trowel from the corner to the outer edge of the mesh.

28. While the Genesis DM base coat is still wet, place Dryvit Intermediate Mesh (12 oz./yd.

weight) against the wet mixture. With the curve of the mesh against the wall, trowel from the center to the edges, avoiding wrinkles, until the mesh is fully embedded into the wet base coat.

29. With the use of a steel trowel, apply an additional Genesis DM base coat over the reinforcement, with a minimum of two passes. The overall minimum base coat thickness shall be sufficient to fully embed the reinforcing mesh.

30. Field lap the reinforcement mesh to have at least 2-1/2 in laps.

31. Laps of field reinforcement within 8 in. of an outside corner are not permitted.

32. Allow the base coat mixture to tack up until firm to the touch. Trowel a second tight coat of the base coat mixture over the first coat to fully cover the reinforcing mesh. The result should be such that the reinforcing mesh is centered within the base coat thickness. Do not allow the first pass to completely dry before the second pass. Allow the base coat to cure a minimum of 24 hours before primer and finish coat.

33. Finish Coat: Inspect the outer plane of the base coat for any irregularities such as trowel marks, board lines, rough corners and edges, improper reinforcing mesh embedment, and efflorescence. Remove and/or repair work to achieve a fully finished base coat.

a. Before the application of the finish coat, the contractor shall provide the consultant with a sample panel (minimum 24 in. square) of the proposed finish and texture for approval. Retain a sample of the existing EIFS finish for comparison to the proposed new finish. New finish shall closely match the previous texture and pigment.

b. After approval of the finish sample(s), mix Dryvit Color Prime-W water-based primer to a smooth homogeneous consistency. Apply the primer per the manufacturer with airless spray equipment.

c. Apply Dryvit DPR water-based finish coat per the manufacturer. Do not apply the finish coat where joint sealants are to be applied.

i. Using a clean stainless-steel trowel, apply a coat of the Dryvit finish in a uniform thickness on the properly prepared base coat.

ii. Finishes must be installed continuously to a natural break such as corners, expansion joints, tapeline or continuous flashing joint.

iii. Installation is to maintain a wet edge.

iv. Materials are to be provided in a single batch to complete the project to avoid potential color variations from batch to batch.

v. Sufficient personnel and scaffolding are to be provided to continuously finish a distinct wall area.

vi. On hot windy days, the wall may be fogged with clean potable water to cool the wall and facilitate finish installation. Installation is to be in strict compliance with the manufacturer’s requirements for hot weather application.

vii. Each mechanic must use the same tool and hand motion so that a matching texture results for the entire wall surface when compared to work above, below, and on each side.

viii. Use finish from a single batch number whenever possible. Do not apply the finish in the rain.

34. Hold the EIFS system away +/- 3/8 in. from penetrations, doors, windows, and dissimilar assemblies for the installation of new, water-shedding, dynamic joints.

a. “Back wrap” sections of EPS foam with full embedment into base coat at conditions where sealant joints will be provided.

b. Install the EIFS system, including cementitious lamina. At conditions where sealant joints will be required to bond to the new EIFS panels, DO NOT extend the finish coat into the bond zone.

c. Install Tremco Spectrem 1 silicone sealant over Nomaco SofRod bi-cellular polyethylene foam backer rod to provide continuous weather seal at vertical control joints and interfaces with other exterior assemblies including flashings and windows and doors.

d. Before installing the new sealant, joints shall be cleaned using a “two-cloth” cleaning method.

e. Dispense isopropyl alcohol (min. 90% solution) on a clean, lint-free cloth.

Thoroughly wipe the interior surfaces of the joint. Do not touch the new finish coat with solvent.

f. Set the backer rod into the joint, maintaining a uniform 2:1 (width to depth) ratio.

Ensure an hourglass profile.

g. Sealant is to be installed at all interfaces between EIFS and adjacent materials, including vertical and horizontal joints. At drainage locations for the EIFS system, continuously open joints are sealed with drainage points provided.

h. Provide 3/4 in. wide cut openings at 16 in. centers along the various the sill conditions to permit drainage.

i. Friction-fit 10 PPI (pores per inch) reticulated foam baffles into the cut weep openings. Use baffles colored to match the color of the adjacent sealant.

Punched Windows

35. Windows: Windows facing the airport runway (north elevation) shall be replaced. Remove and discard all windows at the north elevation.

36. Rough Opening Treatment at New Windows: Apply vapor-impermeable, cold fluid-applied flashing membrane at the window and door rough openings, penetrations and various saddles using Dryvit AquaFlash.

a. Provide substrate preparation and adhesion testing per the manufacturer’s instructions. Substrates must be made properly smooth, clean, dry to the touch, and free of any contaminants that may interfere with adhesion.

b. Pre-lay out the manufacturer’s flashing reinforcement (AquaFlash Mesh) across the sill of the rough opening at windows to be replaced. Extend a minimum of 4 in.

beyond each jamb. Keep protected until application of cold fluid-applied flashing membrane. Avoid cutting mesh when set in wet membrane so that embedment depth is maintained.

c. Ensure that structural back dam angle (new window locations) is set to the appropriate location and anchored into framing.

d. Beginning at the sill, use a brush or 3/4 in. nap roller and apply a liberal coat of Dryvit AquaFlash cold fluid-applied flashing membrane over the water-resistive air barrier. Extend the flashing membrane onto the structural back dam angle.

e. Lay the AquaFlash Mesh into the wet material and fully embed. Add additional flashing membrane material as required but provide a smooth sill that promotes water drainage from the sub-sill pan.

f. Install the Dryvit AquaFlash cold fluid-applied flashing membrane up the jambs and across the head in the same fully-reinforced manner as described for the sill.

Overlap the mesh at the sill with a minimum 2 in lap, incorporating a mesh butterfly at the sill to jamb corner to reinforce the joint. Take care not to make the membrane too thick at this corner lap joint.

37. Provide new Kawneer Trifab VersaGlaze 451/451T) window units.

a. Perimeter dimension shall be undersized +/- 3/4 in. in both width and height to accommodate flashings, sealants, etc.

b. New IGUs (insulated glazing units) shall have an opaque frit to match the existing units to be replaced. Vision glass not permitted.

c. Vendor shall provide engineered shop drawings as part of the submittal process.

38. Outer Sealant Joint (Water-Shedding): Hold the EIFS system away +/- 3/8 in. from penetrations, doors, windows, and dissimilar assemblies for the installation of new, water-shedding, dynamic joints.

a. “Back wrap” sections of EPS foam with full embedment into base coat at conditions where sealant joints will be provided.

b. Install the EIFS system, including cementitious lamina. At conditions where sealant joints will be required to bond to the new EIFS panels, DO NOT extend the finish coat into the bond zone.

c. Install Tremco Spectrem 1 silicone sealant over Nomaco SofRod bi-cellular polyethylene foam backer rod to provide continuous weather seal at vertical control joints and interfaces with other exterior assemblies including flashings and windows and doors.

d. Before installing the new sealant, joints shall be cleaned using a “two-cloth”

e. Dispense isopropyl alcohol (min. 90% solution) on a clean, lint-free cloth.

Thoroughly wipe the interior surfaces of the joint. Do not touch the new finish coat with solvent.

f. Set the backer rod into the joint, maintaining a uniform 2:1 (width to depth) ratio.

39. Inner Sealant Joint (Primary Air Seal): Install Tremco Spectrem 1 silicone sealant over

Nomaco SofRod bi-cellular polyethylene foam backer rod to provide a continuous air seal between the interior window frame at adjacent air barrier pre-strip materials extending inward at the jambs and head.

a. Before installing the new sealant, joints shall be cleaned using a “two-cloth”

b. Dispense isopropyl alcohol (min. 90% solution) on a clean, lint-free cloth.

Thoroughly wipe the interior surfaces of the joint.

c. Set the backer rod into the joint, maintaining a uniform 2:1 (width to depth) ratio.

Gutters

40. Clean and prepare the existing gutters to receive an application of cold fluid-applied waterproofing at seams and at downspout interfaces (throats).

41. With use of a wire wheel, abrade the interior portion of the gutter at seams and downspout connections. Wipe clean with Xylene and allow to flash.

42. With use of painter’s tape, create a zone, centered on the gutter joint/seam, +/- 6 in. wide (3 in. each side).

43. Prior to the start of the waterproofing, lay out a section of Tremco 2011 open-weave glass reinforcing fabric. Pre-cut the sections of reinforcement so that the edges are +/- 1/2 in.

from the boundary edges. This will ensure that the base and top coats have membrane to membrane adhesion, and that the edge of the reinforcement is completely encapsulated with resin. At downspouts, cut the opening for the downspout.

44. Apply Tremco AlphaGuard M-Prime to the targeted area and allow cure.

45. Base Coat: Apply Tremco AlphaGuard MT base coat (first application) over the primed zone with a brush or roller.

a. While the first base coat application is still wet, embed Tremco 2011 open-weave glass reinforcing fabric. Ensure edges and matrix of reinforcement is completely saturated with base coat.

b. Ensure that the 1/2 in. relief is provided at the edges.

c. Apply a second application of base coat over the reinforced zone. Allow cure.

46. Top Coat: Apply Tremco AlphaGuard MT top coat over the cured base coat. Ensure complete closure at the edge. While the top coat is still wet, carefully remove the painter’s tape.

END OF SCOPE

Closing

Certa Building Solutions reserves the right to amend, modify, and/or re-issue this document as more information is reviewed or as additional investigation proceeds. This document is intended solely for use by our client and should, in any event, be reproduced only in its entirety, with this disclaimer included.

We appreciate your confidence in Certa. Please do not hesitate to contact the author with any questions.

Yours truly, Certa Building Solutions

Dan Rundle

AIA, NCARB, RRC, RWC, RRO, CDT

Senior Building Science Specialist

APPENDIX A – SUPPORTING IMAGES

Photo 01

Overview of the south elevation, western portion.

The main entrance is behind the round planter.

• Large planters are situated at the front portion of the facility.

Photo 02

Overview of the south elevation, eastern portion.

• Large planters are situated at the front portion of the facility.

Photo 03

Overview of the west planter, shown in photo 01.

• Planters are not in scope.

Photo 04

South-facing window (red arrow). Not in scope.

• Remove existing EIFS.

• Provide new water-managed EIFS per scope.

• Window not in scope, provide cold fluid-applied closure (membrane, primary layer) and outer, water-shedding seal between new EIFS and window to remain.

Photo 05

Overview of the north exterior wall, from the interior.

North-facing windows to be replaced as part of the work.

• Integrate new windows to surrounding EIFS system with liquid flashings per

• New IGUs shall have an opaque frit for security.

Photo 06

North elevation, as observed from exterior – looking east.

• Provide new aluminum windows (north elevation only) per scope.

Photo 07

North elevation, as observed from exterior, looking west.

• Provide new aluminum windows (north elevation only) per scope.

Photo 08

North elevation - vertical crack at in-service lamina.

• Elevated moisture reading confirmed.

Photo 09

North elevation – base of wall condition.

Photo 10

North elevation – garage door jamb condition.

Photo 11

North elevation, near east corner at metal panel cladding.

• Remove and dispose of existing metal panel system.

• The in-service EIFS appears to be saturated.

Photo 12

North elevation, within mechanical well.

• The in-service EIFS appears to be saturated.

Photo 13

Water staining on the interior plane of the concrete foundation wall, looking down from the sill track in the previous photo.

Photo 14

Overview of the standing seam metal roof (not in scope).

Photo 15

Exterior electrical box.

Photo 16

Conduit penetration.

Photo 17

East elevation windows.

• Window not in scope, provide cold fluid-applied closure (membrane, primary layer) and outer, water-shedding seal between new EIFS and window to remain.

Photo 18

Water staining at an in-service gutter condition.

• Provide cold fluid-applied waterproofing per

• Elevated moisture at in-service EIFS, directly below failed joint in gutter above.

Photo 19

Close up of the plate steel head wrap at the upper portion of the punched window in the stair tower.

• Corrosion is evident related to years of bulk moisture (precipitation) accumulation at this condition.

Photo 20

Overview of the south elevation entry, east zone.

Photo 21

Close-up of the moisture meter on the exterior EIFS wall shown in the previous photo.

• Elevated moisture at in-service EIFS, directly below failed joint in gutter above.

B315 EXTERIOR REPAIR SITE PLAN- JULY 2025

MATERIAL LAYDOWN

CONTRACTOR PARKING

Flightline

ANY WORK COMPLETED ON

THE FLIGHTLINE SIDE OF

THE FENCE WILL NEED

100% ESCORT. THIS WORK

WILL NEED TO BE

COORDINATED AHEAD OF

TIME AND STRICTLY ADHERE

TO THE SCHEDULE.

FLIGHTLINE FENCE

B315 Site Plan.pdf

Slide Number 1